GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/env/Kconfig

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+menu "Environment"
+
+config ENV_IS_NOWHERE
+	bool "Environment is not stored"
+	default y if !ENV_IS_IN_EEPROM && !ENV_IS_IN_EXT4 && \
+		     !ENV_IS_IN_FAT && !ENV_IS_IN_FLASH && \
+		     !ENV_IS_IN_MMC && !ENV_IS_IN_NAND && \
+		     !ENV_IS_IN_NVRAM && !ENV_IS_IN_ONENAND && \
+		     !ENV_IS_IN_REMOTE && !ENV_IS_IN_SPI_FLASH && \
+		     !ENV_IS_IN_UBI
+	help
+	  Define this if you don't want to or can't have an environment stored
+	  on a storage medium. In this case the environment will still exist
+	  while U-Boot is running, but once U-Boot exits it will not be
+	  stored. U-Boot will therefore always start up with a default
+	  environment.
+
+config ENV_IS_IN_EEPROM
+	bool "Environment in EEPROM"
+	depends on !CHAIN_OF_TRUST
+	help
+	  Use this if you have an EEPROM or similar serial access
+	  device and a driver for it.
+
+	  - CONFIG_ENV_OFFSET:
+	  - CONFIG_ENV_SIZE:
+
+	  These two #defines specify the offset and size of the
+	  environment area within the total memory of your EEPROM.
+
+	  Note that we consider the length of the address field to
+	  still be one byte because the extra address bits are hidden
+	  in the chip address.
+
+	  - CONFIG_ENV_EEPROM_IS_ON_I2C
+	  define this, if you have I2C and SPI activated, and your
+	  EEPROM, which holds the environment, is on the I2C bus.
+
+	  - CONFIG_I2C_ENV_EEPROM_BUS
+	  if you have an Environment on an EEPROM reached over
+	  I2C muxes, you can define here, how to reach this
+	  EEPROM. For example:
+
+	  #define CONFIG_I2C_ENV_EEPROM_BUS	  1
+
+	  EEPROM which holds the environment, is reached over
+	  a pca9547 i2c mux with address 0x70, channel 3.
+
+config ENV_IS_IN_FAT
+	bool "Environment is in a FAT filesystem"
+	depends on !CHAIN_OF_TRUST
+	default y if ARCH_BCM283X
+	default y if ARCH_SUNXI && MMC
+	default y if MMC_OMAP_HS && TI_COMMON_CMD_OPTIONS
+	select FS_FAT
+	select FAT_WRITE
+	help
+	  Define this if you want to use the FAT file system for the environment.
+
+config ENV_IS_IN_EXT4
+	bool "Environment is in a EXT4 filesystem"
+	depends on !CHAIN_OF_TRUST
+	select EXT4_WRITE
+	help
+	  Define this if you want to use the EXT4 file system for the environment.
+
+config ENV_IS_IN_FLASH
+	bool "Environment in flash memory"
+	depends on !CHAIN_OF_TRUST
+	default y if ARCH_CINTEGRATOR
+	default y if ARCH_INTEGRATOR_CP
+	default y if M548x || M547x || M5282 || MCF547x_8x
+	default y if MCF532x || MCF52x2
+	default y if MPC86xx || MPC83xx
+	default y if ARCH_MPC8572 || ARCH_MPC8548 || ARCH_MPC8641
+	default y if SH && !CPU_SH4
+	help
+	  Define this if you have a flash device which you want to use for the
+	  environment.
+
+	  a) The environment occupies one whole flash sector, which is
+	   "embedded" in the text segment with the U-Boot code. This
+	   happens usually with "bottom boot sector" or "top boot
+	   sector" type flash chips, which have several smaller
+	   sectors at the start or the end. For instance, such a
+	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
+	   such a case you would place the environment in one of the
+	   4 kB sectors - with U-Boot code before and after it. With
+	   "top boot sector" type flash chips, you would put the
+	   environment in one of the last sectors, leaving a gap
+	   between U-Boot and the environment.
+
+	  CONFIG_ENV_OFFSET:
+
+	   Offset of environment data (variable area) to the
+	   beginning of flash memory; for instance, with bottom boot
+	   type flash chips the second sector can be used: the offset
+	   for this sector is given here.
+
+	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
+
+	  CONFIG_ENV_ADDR:
+
+	   This is just another way to specify the start address of
+	   the flash sector containing the environment (instead of
+	   CONFIG_ENV_OFFSET).
+
+	  CONFIG_ENV_SECT_SIZE:
+
+	   Size of the sector containing the environment.
+
+
+	  b) Sometimes flash chips have few, equal sized, BIG sectors.
+	   In such a case you don't want to spend a whole sector for
+	   the environment.
+
+	  CONFIG_ENV_SIZE:
+
+	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
+	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
+	   of this flash sector for the environment. This saves
+	   memory for the RAM copy of the environment.
+
+	   It may also save flash memory if you decide to use this
+	   when your environment is "embedded" within U-Boot code,
+	   since then the remainder of the flash sector could be used
+	   for U-Boot code. It should be pointed out that this is
+	   STRONGLY DISCOURAGED from a robustness point of view:
+	   updating the environment in flash makes it always
+	   necessary to erase the WHOLE sector. If something goes
+	   wrong before the contents has been restored from a copy in
+	   RAM, your target system will be dead.
+
+	  CONFIG_ENV_ADDR_REDUND
+
+	   These settings describe a second storage area used to hold
+	   a redundant copy of the environment data, so that there is
+	   a valid backup copy in case there is a power failure during
+	   a "saveenv" operation.
+
+	  BE CAREFUL! Any changes to the flash layout, and some changes to the
+	  source code will make it necessary to adapt <board>/u-boot.lds*
+	  accordingly!
+
+config ENV_IS_IN_MMC
+	bool "Environment in an MMC device"
+	depends on !CHAIN_OF_TRUST
+	depends on MMC
+	default y if ARCH_EXYNOS4
+	default y if MX6SX || MX7D
+	default y if TEGRA30 || TEGRA124
+	default y if TEGRA_ARMV8_COMMON
+	help
+	  Define this if you have an MMC device which you want to use for the
+	  environment.
+
+	  CONFIG_SYS_MMC_ENV_DEV:
+
+	  Specifies which MMC device the environment is stored in.
+
+	  CONFIG_SYS_MMC_ENV_PART (optional):
+
+	  Specifies which MMC partition the environment is stored in. If not
+	  set, defaults to partition 0, the user area. Common values might be
+	  1 (first MMC boot partition), 2 (second MMC boot partition).
+
+	  CONFIG_ENV_OFFSET:
+	  CONFIG_ENV_SIZE:
+
+	  These two #defines specify the offset and size of the environment
+	  area within the specified MMC device.
+
+	  If offset is positive (the usual case), it is treated as relative to
+	  the start of the MMC partition. If offset is negative, it is treated
+	  as relative to the end of the MMC partition. This can be useful if
+	  your board may be fitted with different MMC devices, which have
+	  different sizes for the MMC partitions, and you always want the
+	  environment placed at the very end of the partition, to leave the
+	  maximum possible space before it, to store other data.
+
+	  These two values are in units of bytes, but must be aligned to an
+	  MMC sector boundary.
+
+	  CONFIG_ENV_OFFSET_REDUND (optional):
+
+	  Specifies a second storage area, of CONFIG_ENV_SIZE size, used to
+	  hold a redundant copy of the environment data. This provides a
+	  valid backup copy in case the other copy is corrupted, e.g. due
+	  to a power failure during a "saveenv" operation.
+
+	  This value may also be positive or negative; this is handled in the
+	  same way as CONFIG_ENV_OFFSET.
+
+	  This value is also in units of bytes, but must also be aligned to
+	  an MMC sector boundary.
+
+config ENV_IS_IN_NAND
+	bool "Environment in a NAND device"
+	depends on !CHAIN_OF_TRUST
+	help
+	  Define this if you have a NAND device which you want to use for the
+	  environment.
+
+	  - CONFIG_ENV_OFFSET:
+	  - CONFIG_ENV_SIZE:
+
+	  These two #defines specify the offset and size of the environment
+	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
+	  aligned to an erase block boundary.
+
+	  - CONFIG_ENV_OFFSET_REDUND (optional):
+
+	  This setting describes a second storage area of CONFIG_ENV_SIZE
+	  size used to hold a redundant copy of the environment data, so
+	  that there is a valid backup copy in case there is a power failure
+	  during a "saveenv" operation.	 CONFIG_ENV_OFFSET_REDUND must be
+	  aligned to an erase block boundary.
+
+	  - CONFIG_ENV_RANGE (optional):
+
+	  Specifies the length of the region in which the environment
+	  can be written.  This should be a multiple of the NAND device's
+	  block size.  Specifying a range with more erase blocks than
+	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
+	  the range to be avoided.
+
+	  - CONFIG_ENV_OFFSET_OOB (optional):
+
+	  Enables support for dynamically retrieving the offset of the
+	  environment from block zero's out-of-band data.  The
+	  "nand env.oob" command can be used to record this offset.
+	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
+	  using CONFIG_ENV_OFFSET_OOB.
+
+config ENV_IS_IN_NVRAM
+	bool "Environment in a non-volatile RAM"
+	depends on !CHAIN_OF_TRUST
+	help
+	  Define this if you have some non-volatile memory device
+	  (NVRAM, battery buffered SRAM) which you want to use for the
+	  environment.
+
+	  - CONFIG_ENV_ADDR:
+	  - CONFIG_ENV_SIZE:
+
+	  These two #defines are used to determine the memory area you
+	  want to use for environment. It is assumed that this memory
+	  can just be read and written to, without any special
+	  provision.
+
+config ENV_IS_IN_ONENAND
+	bool "Environment is in OneNAND"
+	depends on !CHAIN_OF_TRUST
+	help
+	  Define this if you want to put your local device's environment in
+	  OneNAND.
+
+	  - CONFIG_ENV_ADDR:
+	  - CONFIG_ENV_SIZE:
+
+	  These two #defines are used to determine the device range you
+	  want to use for environment. It is assumed that this memory
+	  can just be read and written to, without any special
+	  provision.
+
+config ENV_IS_IN_REMOTE
+	bool "Environment is in remote memory space"
+	depends on !CHAIN_OF_TRUST
+	help
+	  Define this if you have a remote memory space which you
+	  want to use for the local device's environment.
+
+	  - CONFIG_ENV_ADDR:
+	  - CONFIG_ENV_SIZE:
+
+	  These two #defines specify the address and size of the
+	  environment area within the remote memory space. The
+	  local device can get the environment from remote memory
+	  space by SRIO or PCIE links.
+
+config ENV_IS_IN_SPI_FLASH
+	bool "Environment is in SPI flash"
+	depends on !CHAIN_OF_TRUST && SPI || FMC
+	default y if ARMADA_XP
+	default y if INTEL_BAYTRAIL
+	default y if INTEL_BRASWELL
+	default y if INTEL_BROADWELL
+	default y if NORTHBRIDGE_INTEL_IVYBRIDGE
+	default y if INTEL_QUARK
+	default y if INTEL_QUEENSBAY
+	help
+	  Define this if you have a SPI Flash memory device which you
+	  want to use for the environment.
+
+	  - CONFIG_ENV_OFFSET:
+	  - CONFIG_ENV_SIZE:
+
+	  These two #defines specify the offset and size of the
+	  environment area within the SPI Flash. CONFIG_ENV_OFFSET must be
+	  aligned to an erase sector boundary.
+
+	  - CONFIG_ENV_SECT_SIZE:
+
+	  Define the SPI flash's sector size.
+
+	  - CONFIG_ENV_OFFSET_REDUND (optional):
+
+	  This setting describes a second storage area of CONFIG_ENV_SIZE
+	  size used to hold a redundant copy of the environment data, so
+	  that there is a valid backup copy in case there is a power failure
+	  during a "saveenv" operation. CONFIG_ENV_OFFSET_REDUND must be
+	  aligned to an erase sector boundary.
+
+config USE_ENV_SPI_BUS
+	bool "SPI flash bus for environment"
+	depends on ENV_IS_IN_SPI_FLASH
+	help
+	  Force the SPI bus for environment.
+	  If not defined, use CONFIG_SF_DEFAULT_BUS.
+
+config ENV_SPI_BUS
+	int "Value of SPI flash bus for environment"
+	depends on USE_ENV_SPI_BUS
+	help
+	  Value the SPI bus and chip select for environment.
+
+config USE_ENV_SPI_CS
+	bool "SPI flash chip select for environment"
+	depends on ENV_IS_IN_SPI_FLASH
+	help
+	  Force the SPI chip select for environment.
+	  If not defined, use CONFIG_SF_DEFAULT_CS.
+
+config ENV_SPI_CS
+	int "Value of SPI flash chip select for environment"
+	depends on USE_ENV_SPI_CS
+	help
+	  Value of the SPI chip select for environment.
+
+config USE_ENV_SPI_MAX_HZ
+	bool "SPI flash max frequency for environment"
+	depends on ENV_IS_IN_SPI_FLASH
+	help
+	  Force the SPI max work clock for environment.
+	  If not defined, use CONFIG_SF_DEFAULT_SPEED.
+
+config ENV_SPI_MAX_HZ
+	int "Value of SPI flash max frequency for environment"
+	depends on USE_ENV_SPI_MAX_HZ
+	help
+	  Value of the SPI max work clock for environment.
+
+config USE_ENV_SPI_MODE
+	bool "SPI flash mode for environment"
+	depends on ENV_IS_IN_SPI_FLASH
+	help
+	  Force the SPI work mode for environment.
+
+config ENV_SPI_MODE
+	hex "Value of SPI flash work mode for environment"
+	depends on USE_ENV_SPI_MODE
+	help
+	  Value of the SPI work mode for environment.
+	  See include/spi.h for value.
+
+config ENV_IS_IN_UBI
+	bool "Environment in a UBI volume"
+	depends on !CHAIN_OF_TRUST
+	depends on MTD_UBI
+	depends on CMD_UBI
+	help
+	  Define this if you have an UBI volume that you want to use for the
+	  environment.  This has the benefit of wear-leveling the environment
+	  accesses, which is important on NAND.
+
+	  - CONFIG_ENV_UBI_PART:
+
+	  Define this to a string that is the mtd partition containing the UBI.
+
+	  - CONFIG_ENV_UBI_VOLUME:
+
+	  Define this to the name of the volume that you want to store the
+	  environment in.
+
+	  - CONFIG_ENV_UBI_VOLUME_REDUND:
+
+	  Define this to the name of another volume to store a second copy of
+	  the environment in.  This will enable redundant environments in UBI.
+	  It is assumed that both volumes are in the same MTD partition.
+
+config SYS_REDUNDAND_ENVIRONMENT
+	bool "Enable redundant environment support"
+	depends on ENV_IS_IN_EEPROM || ENV_IS_IN_FLASH || ENV_IS_IN_MMC || \
+		ENV_IS_IN_NAND || ENV_IS_IN_SPI_FLASH || ENV_IS_IN_UBI
+	help
+	  Normally, the environemt is stored in a single location.  By
+	  selecting this option, you can then define where to hold a redundant
+	  copy of the environment data, so that there is a valid backup copy in
+	  case there is a power failure during a "saveenv" operation.
+
+config ENV_FAT_INTERFACE
+	string "Name of the block device for the environment"
+	depends on ENV_IS_IN_FAT
+	default "mmc" if ARCH_SUNXI
+	default "mmc" if TI_COMMON_CMD_OPTIONS || ARCH_ZYNQMP || ARCH_AT91
+	help
+	  Define this to a string that is the name of the block device.
+
+config ENV_FAT_DEVICE_AND_PART
+	string "Device and partition for where to store the environemt in FAT"
+	depends on ENV_IS_IN_FAT
+	default "0:1" if TI_COMMON_CMD_OPTIONS
+	default "0:auto" if ARCH_ZYNQMP
+	default "0:auto" if ARCH_SUNXI && MMC_SUNXI_SLOT_EXTRA = -1
+	default "1:auto" if ARCH_SUNXI && MMC_SUNXI_SLOT_EXTRA != -1
+	default "0" if ARCH_AT91
+	help
+	  Define this to a string to specify the partition of the device. It can
+	  be as following:
+
+	    "D:P", "D:0", "D", "D:" or "D:auto" (D, P are integers. And P >= 1)
+	       - "D:P": device D partition P. Error occurs if device D has no
+	                partition table.
+	       - "D:0": device D.
+	       - "D" or "D:": device D partition 1 if device D has partition
+	                      table, or the whole device D if has no partition
+	                      table.
+	       - "D:auto": first partition in device D with bootable flag set.
+	                   If none, first valid partition in device D. If no
+	                   partition table then means device D.
+
+config ENV_FAT_FILE
+	string "Name of the FAT file to use for the environment"
+	depends on ENV_IS_IN_FAT
+	default "uboot.env"
+	help
+	  It's a string of the FAT file name. This file use to store the
+	  environment.
+
+config ENV_EXT4_INTERFACE
+	string "Name of the block device for the environment"
+	depends on ENV_IS_IN_EXT4
+	help
+	  Define this to a string that is the name of the block device.
+
+config ENV_EXT4_DEVICE_AND_PART
+	string "Device and partition for where to store the environemt in EXT4"
+	depends on ENV_IS_IN_EXT4
+	help
+	  Define this to a string to specify the partition of the device. It can
+	  be as following:
+
+	    "D:P", "D:0", "D", "D:" or "D:auto" (D, P are integers. And P >= 1)
+	       - "D:P": device D partition P. Error occurs if device D has no
+	                partition table.
+	       - "D:0": device D.
+	       - "D" or "D:": device D partition 1 if device D has partition
+	                      table, or the whole device D if has no partition
+	                      table.
+	       - "D:auto": first partition in device D with bootable flag set.
+	                   If none, first valid partition in device D. If no
+	                   partition table then means device D.
+
+config ENV_EXT4_FILE
+	string "Name of the EXT4 file to use for the environment"
+	depends on ENV_IS_IN_EXT4
+	default "uboot.env"
+	help
+	  It's a string of the EXT4 file name. This file use to store the
+	  environment (explicit path to the file)
+
+config ENV_ADDR
+	hex "Environment address"
+	depends on ENV_IS_IN_FLASH || ENV_IS_IN_NVRAM || ENV_IS_IN_ONENAND || \
+		     ENV_IS_IN_REMOTE || ENV_IS_IN_SPI_FLASH
+	default 0x0 if ENV_IS_IN_SPI_FLASH
+	help
+	  Offset from the start of the device (or partition)
+
+config ENV_ADDR_REDUND
+	hex "Redundant environment address"
+	depends on ENV_IS_IN_FLASH && SYS_REDUNDAND_ENVIRONMENT
+	help
+	  Offset from the start of the device (or partition) of the redundant
+	  environment location.
+
+config ENV_OFFSET
+	hex "Environment offset"
+	depends on ENV_IS_IN_EEPROM || ENV_IS_IN_MMC || ENV_IS_IN_NAND || \
+		    ENV_IS_IN_SPI_FLASH
+	default 0x3f8000 if ARCH_ROCKCHIP
+	default 0x88000 if ARCH_SUNXI
+	default 0xE0000 if ARCH_ZYNQ
+	default 0x1E00000 if ARCH_ZYNQMP
+	default 0x7F40000 if ARCH_VERSAL
+	default 0 if ARC
+	default 0x140000 if ARCH_AT91
+	default 0x260000 if ARCH_OMAP2PLUS
+	help
+	  Offset from the start of the device (or partition)
+
+config ENV_OFFSET_REDUND
+	hex "Redundant environment offset"
+	depends on (ENV_IS_IN_EEPROM || ENV_IS_IN_MMC || ENV_IS_IN_NAND || \
+		    ENV_IS_IN_SPI_FLASH) && SYS_REDUNDAND_ENVIRONMENT
+	help
+	  Offset from the start of the device (or partition) of the redundant
+	  environment location.
+
+config ENV_SIZE
+	hex "Environment Size"
+	default 0x40000 if ENV_IS_IN_SPI_FLASH && ARCH_ZYNQMP
+	default 0x20000 if ARCH_SUNXI || ARCH_ZYNQ || ARCH_OMAP2PLUS || ARCH_AT91
+	default 0x8000 if ARCH_ROCKCHIP || ARCH_ZYNQMP || ARCH_VERSAL
+	default 0x4000 if ARC
+	default 0x1f000
+	help
+	  Size of the environment storage area
+
+config ENV_SECT_SIZE
+	hex "Environment Sector-Size"
+	depends on ENV_IS_IN_FLASH || ENV_IS_IN_SPI_FLASH
+	default 0x40000 if ARCH_ZYNQMP || ARCH_VERSAL
+	default 0x20000 if ARCH_ZYNQ || ARCH_OMAP2PLUS || ARCH_AT91
+	help
+	  Size of the sector containing the environment.
+
+config ENV_UBI_PART
+	string "UBI partition name"
+	depends on ENV_IS_IN_UBI
+	help
+	  MTD partition containing the UBI device
+
+config ENV_UBI_VOLUME
+	string "UBI volume name"
+	depends on ENV_IS_IN_UBI
+	help
+	  Name of the volume that you want to store the environment in.
+
+config ENV_UBI_VOLUME_REDUND
+	string "UBI redundant volume name"
+	depends on ENV_IS_IN_UBI && SYS_REDUNDAND_ENVIRONMENT
+	help
+	  Name of the redundant volume that you want to store the environment in.
+
+config ENV_UBI_VID_OFFSET
+	int "ubi environment VID offset"
+	depends on ENV_IS_IN_UBI
+	default 0
+	help
+	  UBI VID offset for environment. If 0, no custom VID offset is used.
+
+config SYS_RELOC_GD_ENV_ADDR
+	bool "Relocate gd->en_addr"
+	help
+	  Relocate the early env_addr pointer so we know it is not inside
+	  the binary. Some systems need this and for the rest, it doesn't hurt.
+
+config USE_DEFAULT_ENV_FILE
+	bool "Create default environment from file"
+	help
+	  Normally, the default environment is automatically generated
+	  based on the settings of various CONFIG_* options, as well
+	  as the CONFIG_EXTRA_ENV_SETTINGS. By selecting this option,
+	  you can instead define the entire default environment in an
+	  external file.
+
+config DEFAULT_ENV_FILE
+	string "Path to default environment file"
+	depends on USE_DEFAULT_ENV_FILE
+	help
+	  The path containing the default environment. The format is
+	  the same as accepted by the mkenvimage tool: lines
+	  containing key=value pairs, blank lines and lines beginning
+	  with # are ignored.
+
+config ENV_VARS_UBOOT_RUNTIME_CONFIG
+	bool "Add run-time information to the environment"
+	help
+	  Enable this in order to add variables describing certain
+	  run-time determined information about the hardware to the
+	  environment.  These will be named board_name, board_rev.
+
+if SPL_ENV_SUPPORT
+config SPL_ENV_IS_NOWHERE
+	bool "SPL Environment is not stored"
+	default y if ENV_IS_NOWHERE
+	help
+	  Similar to ENV_IS_NOWHERE, used for SPL environment.
+
+config SPL_ENV_IS_IN_MMC
+	bool "SPL Environment in an MMC device"
+	depends on !SPL_ENV_IS_NOWHERE
+	depends on ENV_IS_IN_MMC
+	default y
+	help
+	  Similar to ENV_IS_IN_MMC, used for SPL environment.
+
+config SPL_ENV_IS_IN_FAT
+	bool "SPL Environment is in a FAT filesystem"
+	depends on !SPL_ENV_IS_NOWHERE
+	depends on ENV_IS_IN_FAT
+	default y
+	help
+	  Similar to ENV_IS_IN_FAT, used for SPL environment.
+
+config SPL_ENV_IS_IN_EXT4
+	bool "SPL Environment is in a EXT4 filesystem"
+	depends on !SPL_ENV_IS_NOWHERE
+	depends on ENV_IS_IN_EXT4
+	default y
+	help
+	  Similar to ENV_IS_IN_EXT4, used for SPL environment.
+
+config SPL_ENV_IS_IN_NAND
+	bool "SPL Environment in a NAND device"
+	depends on !SPL_ENV_IS_NOWHERE
+	depends on ENV_IS_IN_NAND
+	default y
+	help
+	  Similar to ENV_IS_IN_NAND, used for SPL environment.
+
+config SPL_ENV_IS_IN_SPI_FLASH
+	bool "SPL Environment is in SPI flash"
+	depends on !SPL_ENV_IS_NOWHERE
+	depends on ENV_IS_IN_SPI_FLASH
+	default y
+	help
+	  Similar to ENV_IS_IN_SPI_FLASH, used for SPL environment.
+
+config SPL_ENV_IS_IN_FLASH
+	bool "SPL Environment in flash memory"
+	depends on !SPL_ENV_IS_NOWHERE
+	depends on ENV_IS_IN_FLASH
+	default y
+	help
+	  Similar to ENV_IS_IN_FLASH, used for SPL environment.
+
+endif
+
+if TPL_ENV_SUPPORT
+
+config TPL_ENV_IS_NOWHERE
+	bool "TPL Environment is not stored"
+	default y if ENV_IS_NOWHERE
+	help
+	  Similar to ENV_IS_NOWHERE, used for TPL environment.
+
+config TPL_ENV_IS_IN_MMC
+	bool "TPL Environment in an MMC device"
+	depends on !TPL_ENV_IS_NOWHERE
+	depends on ENV_IS_IN_MMC
+	default y
+	help
+	  Similar to ENV_IS_IN_MMC, used for TPL environment.
+
+config TPL_ENV_IS_IN_FAT
+	bool "TPL Environment is in a FAT filesystem"
+	depends on !TPL_ENV_IS_NOWHERE
+	depends on ENV_IS_IN_FAT
+	default y
+	help
+	  Similar to ENV_IS_IN_FAT, used for TPL environment.
+
+config TPL_ENV_IS_IN_EXT4
+	bool "TPL Environment is in a EXT4 filesystem"
+	depends on !TPL_ENV_IS_NOWHERE
+	depends on ENV_IS_IN_EXT4
+	default y
+	help
+	  Similar to ENV_IS_IN_EXT4, used for TPL environment.
+
+config TPL_ENV_IS_IN_NAND
+	bool "TPL Environment in a NAND device"
+	depends on !TPL_ENV_IS_NOWHERE
+	depends on ENV_IS_IN_NAND
+	default y
+	help
+	  Similar to ENV_IS_IN_NAND, used for TPL environment.
+
+config TPL_ENV_IS_IN_SPI_FLASH
+	bool "TPL Environment is in SPI flash"
+	depends on !TPL_ENV_IS_NOWHERE
+	depends on ENV_IS_IN_SPI_FLASH
+	default y
+	help
+	  Similar to ENV_IS_IN_SPI_FLASH, used for TPL environment.
+
+config TPL_ENV_IS_IN_FLASH
+	bool "TPL Environment in flash memory"
+	depends on !TPL_ENV_IS_NOWHERE
+	depends on ENV_IS_IN_FLASH
+	default y
+	help
+	  Similar to ENV_IS_IN_FLASH, used for TPL environment.
+
+endif
+
+endmenu

source/bootloader/u-boot-2020.01/env/Makefile

@@ -0,0 +1,36 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2004-2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+
+obj-y += common.o env.o
+
+ifndef CONFIG_SPL_BUILD
+obj-y += attr.o
+obj-y += callback.o
+obj-y += flags.o
+obj-$(CONFIG_ENV_IS_IN_EEPROM) += eeprom.o
+extra-$(CONFIG_ENV_IS_EMBEDDED) += embedded.o
+obj-$(CONFIG_ENV_IS_IN_EEPROM) += embedded.o
+extra-$(CONFIG_ENV_IS_IN_FLASH) += embedded.o
+obj-$(CONFIG_ENV_IS_IN_NVRAM) += embedded.o
+obj-$(CONFIG_ENV_IS_IN_NVRAM) += nvram.o
+obj-$(CONFIG_ENV_IS_IN_ONENAND) += onenand.o
+obj-$(CONFIG_ENV_IS_IN_SATA) += sata.o
+obj-$(CONFIG_ENV_IS_IN_REMOTE) += remote.o
+obj-$(CONFIG_ENV_IS_IN_UBI) += ubi.o
+else
+obj-$(CONFIG_$(SPL_TPL_)ENV_SUPPORT) += attr.o
+obj-$(CONFIG_$(SPL_TPL_)ENV_SUPPORT) += flags.o
+obj-$(CONFIG_$(SPL_TPL_)ENV_SUPPORT) += callback.o
+endif
+
+obj-$(CONFIG_$(SPL_TPL_)ENV_IS_NOWHERE) += nowhere.o
+obj-$(CONFIG_$(SPL_TPL_)ENV_IS_IN_MMC) += mmc.o
+obj-$(CONFIG_$(SPL_TPL_)ENV_IS_IN_FAT) += fat.o
+obj-$(CONFIG_$(SPL_TPL_)ENV_IS_IN_EXT4) += ext4.o
+obj-$(CONFIG_$(SPL_TPL_)ENV_IS_IN_NAND) += nand.o
+obj-$(CONFIG_$(SPL_TPL_)ENV_IS_IN_SPI_FLASH) += sf.o
+obj-$(CONFIG_$(SPL_TPL_)ENV_IS_IN_FLASH) += flash.o
+
+CFLAGS_embedded.o := -Wa,--no-warn -DENV_CRC=$(shell tools/envcrc 2>/dev/null)

source/bootloader/u-boot-2020.01/env/attr.c

@@ -0,0 +1,309 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2012
+ * Joe Hershberger, National Instruments, joe.hershberger@ni.com
+ */
+
+#ifdef USE_HOSTCC /* Eliminate "ANSI does not permit..." warnings */
+#include <stdint.h>
+#include <stdio.h>
+#include <linux/linux_string.h>
+#else
+#include <common.h>
+#include <slre.h>
+#endif
+
+#include <env_attr.h>
+#include <errno.h>
+#include <linux/string.h>
+#include <malloc.h>
+
+/*
+ * Iterate through the whole list calling the callback for each found element.
+ * "attr_list" takes the form:
+ *	attributes = [^,:\s]*
+ *	entry = name[:attributes]
+ *	list = entry[,list]
+ */
+int env_attr_walk(const char *attr_list,
+	int (*callback)(const char *name, const char *attributes, void *priv),
+	void *priv)
+{
+	const char *entry, *entry_end;
+	char *name, *attributes;
+
+	if (!attr_list)
+		/* list not found */
+		return 1;
+
+	entry = attr_list;
+	do {
+		char *entry_cpy = NULL;
+
+		entry_end = strchr(entry, ENV_ATTR_LIST_DELIM);
+		/* check if this is the last entry in the list */
+		if (entry_end == NULL) {
+			int entry_len = strlen(entry);
+
+			if (entry_len) {
+				/*
+				 * allocate memory to copy the entry into since
+				 * we will need to inject '\0' chars and squash
+				 * white-space before calling the callback
+				 */
+				entry_cpy = malloc(entry_len + 1);
+				if (entry_cpy)
+					/* copy the rest of the list */
+					strcpy(entry_cpy, entry);
+				else
+					return -ENOMEM;
+			}
+		} else {
+			int entry_len = entry_end - entry;
+
+			if (entry_len) {
+				/*
+				 * allocate memory to copy the entry into since
+				 * we will need to inject '\0' chars and squash
+				 * white-space before calling the callback
+				 */
+				entry_cpy = malloc(entry_len + 1);
+				if (entry_cpy) {
+					/* copy just this entry and null term */
+					strncpy(entry_cpy, entry, entry_len);
+					entry_cpy[entry_len] = '\0';
+				} else
+					return -ENOMEM;
+			}
+		}
+
+		/* check if there is anything to process (e.g. not ",,,") */
+		if (entry_cpy != NULL) {
+			attributes = strchr(entry_cpy, ENV_ATTR_SEP);
+			/* check if there is a ':' */
+			if (attributes != NULL) {
+				/* replace the ':' with '\0' to term name */
+				*attributes++ = '\0';
+				/* remove white-space from attributes */
+				attributes = strim(attributes);
+			}
+			/* remove white-space from name */
+			name = strim(entry_cpy);
+
+			/* only call the callback if there is a name */
+			if (strlen(name) != 0) {
+				int retval = 0;
+
+				retval = callback(name, attributes, priv);
+				if (retval) {
+					free(entry_cpy);
+					return retval;
+				}
+			}
+		}
+
+		free(entry_cpy);
+		entry = entry_end + 1;
+	} while (entry_end != NULL);
+
+	return 0;
+}
+
+#if defined(CONFIG_REGEX)
+struct regex_callback_priv {
+	const char *searched_for;
+	char *regex;
+	char *attributes;
+};
+
+static int regex_callback(const char *name, const char *attributes, void *priv)
+{
+	int retval = 0;
+	struct regex_callback_priv *cbp = (struct regex_callback_priv *)priv;
+	struct slre slre;
+	char regex[strlen(name) + 3];
+
+	/* Require the whole string to be described by the regex */
+	sprintf(regex, "^%s$", name);
+	if (slre_compile(&slre, regex)) {
+		struct cap caps[slre.num_caps + 2];
+
+		if (slre_match(&slre, cbp->searched_for,
+			       strlen(cbp->searched_for), caps)) {
+			free(cbp->regex);
+			if (!attributes) {
+				retval = -EINVAL;
+				goto done;
+			}
+			cbp->regex = malloc(strlen(regex) + 1);
+			if (cbp->regex) {
+				strcpy(cbp->regex, regex);
+			} else {
+				retval = -ENOMEM;
+				goto done;
+			}
+
+			free(cbp->attributes);
+			cbp->attributes = malloc(strlen(attributes) + 1);
+			if (cbp->attributes) {
+				strcpy(cbp->attributes, attributes);
+			} else {
+				retval = -ENOMEM;
+				free(cbp->regex);
+				cbp->regex = NULL;
+				goto done;
+			}
+		}
+	} else {
+		printf("Error compiling regex: %s\n", slre.err_str);
+		retval = -EINVAL;
+	}
+done:
+	return retval;
+}
+
+/*
+ * Retrieve the attributes string associated with a single name in the list
+ * There is no protection on attributes being too small for the value
+ */
+int env_attr_lookup(const char *attr_list, const char *name, char *attributes)
+{
+	if (!attributes)
+		/* bad parameter */
+		return -EINVAL;
+	if (!attr_list)
+		/* list not found */
+		return -EINVAL;
+
+	struct regex_callback_priv priv;
+	int retval;
+
+	priv.searched_for = name;
+	priv.regex = NULL;
+	priv.attributes = NULL;
+	retval = env_attr_walk(attr_list, regex_callback, &priv);
+	if (retval)
+		return retval; /* error */
+
+	if (priv.regex) {
+		strcpy(attributes, priv.attributes);
+		free(priv.attributes);
+		free(priv.regex);
+		/* success */
+		return 0;
+	}
+	return -ENOENT; /* not found in list */
+}
+#else
+
+/*
+ * Search for the last exactly matching name in an attribute list
+ */
+static int reverse_name_search(const char *searched, const char *search_for,
+	const char **result)
+{
+	int result_size = 0;
+	const char *cur_searched = searched;
+
+	if (result)
+		*result = NULL;
+
+	if (*search_for == '\0') {
+		if (result)
+			*result = searched;
+		return strlen(searched);
+	}
+
+	for (;;) {
+		const char *match = strstr(cur_searched, search_for);
+		const char *prevch;
+		const char *nextch;
+
+		/* Stop looking if no new match is found */
+		if (match == NULL)
+			break;
+
+		prevch = match - 1;
+		nextch = match + strlen(search_for);
+
+		/* Skip spaces */
+		while (*prevch == ' ' && prevch >= searched)
+			prevch--;
+		while (*nextch == ' ')
+			nextch++;
+
+		/* Start looking past the current match so last is found */
+		cur_searched = match + 1;
+		/* Check for an exact match */
+		if (match != searched &&
+		    *prevch != ENV_ATTR_LIST_DELIM &&
+		    prevch != searched - 1)
+			continue;
+		if (*nextch != ENV_ATTR_SEP &&
+		    *nextch != ENV_ATTR_LIST_DELIM &&
+		    *nextch != '\0')
+			continue;
+
+		if (result)
+			*result = match;
+		result_size = strlen(search_for);
+	}
+
+	return result_size;
+}
+
+/*
+ * Retrieve the attributes string associated with a single name in the list
+ * There is no protection on attributes being too small for the value
+ */
+int env_attr_lookup(const char *attr_list, const char *name, char *attributes)
+{
+	const char *entry = NULL;
+	int entry_len;
+
+	if (!attributes)
+		/* bad parameter */
+		return -EINVAL;
+	if (!attr_list)
+		/* list not found */
+		return -EINVAL;
+
+	entry_len = reverse_name_search(attr_list, name, &entry);
+	if (entry != NULL) {
+		int len;
+
+		/* skip the name */
+		entry += entry_len;
+		/* skip spaces */
+		while (*entry == ' ')
+			entry++;
+		if (*entry != ENV_ATTR_SEP)
+			len = 0;
+		else {
+			const char *delim;
+			static const char delims[] = {
+				ENV_ATTR_LIST_DELIM, ' ', '\0'};
+
+			/* skip the attr sep */
+			entry += 1;
+			/* skip spaces */
+			while (*entry == ' ')
+				entry++;
+
+			delim = strpbrk(entry, delims);
+			if (delim == NULL)
+				len = strlen(entry);
+			else
+				len = delim - entry;
+			memcpy(attributes, entry, len);
+		}
+		attributes[len] = '\0';
+
+		/* success */
+		return 0;
+	}
+
+	/* not found in list */
+	return -ENOENT;
+}
+#endif

source/bootloader/u-boot-2020.01/env/callback.c

@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2012
+ * Joe Hershberger, National Instruments, joe.hershberger@ni.com
+ */
+
+#include <common.h>
+#include <env.h>
+#include <env_internal.h>
+
+#if defined(CONFIG_NEEDS_MANUAL_RELOC)
+DECLARE_GLOBAL_DATA_PTR;
+#endif
+
+/*
+ * Look up a callback function pointer by name
+ */
+static struct env_clbk_tbl *find_env_callback(const char *name)
+{
+	struct env_clbk_tbl *clbkp;
+	int i;
+	int num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
+
+	if (name == NULL)
+		return NULL;
+
+	/* look up the callback in the linker-list */
+	for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
+	     i < num_callbacks;
+	     i++, clbkp++) {
+		if (strcmp(name, clbkp->name) == 0)
+			return clbkp;
+	}
+
+	return NULL;
+}
+
+static int first_call = 1;
+static const char *callback_list;
+
+/*
+ * Look for a possible callback for a newly added variable
+ * This is called specifically when the variable did not exist in the hash
+ * previously, so the blanket update did not find this variable.
+ */
+void env_callback_init(struct env_entry *var_entry)
+{
+	const char *var_name = var_entry->key;
+	char callback_name[256] = "";
+	struct env_clbk_tbl *clbkp;
+	int ret = 1;
+
+	if (first_call) {
+		callback_list = env_get(ENV_CALLBACK_VAR);
+		first_call = 0;
+	}
+
+	/* look in the ".callbacks" var for a reference to this variable */
+	if (callback_list != NULL)
+		ret = env_attr_lookup(callback_list, var_name, callback_name);
+
+	/* only if not found there, look in the static list */
+	if (ret)
+		ret = env_attr_lookup(ENV_CALLBACK_LIST_STATIC, var_name,
+			callback_name);
+
+	/* if an association was found, set the callback pointer */
+	if (!ret && strlen(callback_name)) {
+		clbkp = find_env_callback(callback_name);
+		if (clbkp != NULL)
+#if defined(CONFIG_NEEDS_MANUAL_RELOC)
+			var_entry->callback = clbkp->callback + gd->reloc_off;
+#else
+			var_entry->callback = clbkp->callback;
+#endif
+	}
+}
+
+/*
+ * Called on each existing env var prior to the blanket update since removing
+ * a callback association should remove its callback.
+ */
+static int clear_callback(struct env_entry *entry)
+{
+	entry->callback = NULL;
+
+	return 0;
+}
+
+/*
+ * Call for each element in the list that associates variables to callbacks
+ */
+static int set_callback(const char *name, const char *value, void *priv)
+{
+	struct env_entry e, *ep;
+	struct env_clbk_tbl *clbkp;
+
+	e.key	= name;
+	e.data	= NULL;
+	e.callback = NULL;
+	hsearch_r(e, ENV_FIND, &ep, &env_htab, 0);
+
+	/* does the env variable actually exist? */
+	if (ep != NULL) {
+		/* the assocaition delares no callback, so remove the pointer */
+		if (value == NULL || strlen(value) == 0)
+			ep->callback = NULL;
+		else {
+			/* assign the requested callback */
+			clbkp = find_env_callback(value);
+			if (clbkp != NULL)
+#if defined(CONFIG_NEEDS_MANUAL_RELOC)
+				ep->callback = clbkp->callback + gd->reloc_off;
+#else
+				ep->callback = clbkp->callback;
+#endif
+		}
+	}
+
+	return 0;
+}
+
+static int on_callbacks(const char *name, const char *value, enum env_op op,
+	int flags)
+{
+	/* remove all callbacks */
+	hwalk_r(&env_htab, clear_callback);
+
+	/* configure any static callback bindings */
+	env_attr_walk(ENV_CALLBACK_LIST_STATIC, set_callback, NULL);
+	/* configure any dynamic callback bindings */
+	env_attr_walk(value, set_callback, NULL);
+
+	return 0;
+}
+U_BOOT_ENV_CALLBACK(callbacks, on_callbacks);

source/bootloader/u-boot-2020.01/env/common.c

@@ -0,0 +1,320 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2000-2010
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Andreas Heppel <aheppel@sysgo.de>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <env.h>
+#include <env_internal.h>
+#include <sort.h>
+#include <linux/stddef.h>
+#include <search.h>
+#include <errno.h>
+#include <malloc.h>
+#include <u-boot/crc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/************************************************************************
+ * Default settings to be used when no valid environment is found
+ */
+#include <env_default.h>
+
+struct hsearch_data env_htab = {
+	.change_ok = env_flags_validate,
+};
+
+/*
+ * Read an environment variable as a boolean
+ * Return -1 if variable does not exist (default to true)
+ */
+int env_get_yesno(const char *var)
+{
+	char *s = env_get(var);
+
+	if (s == NULL)
+		return -1;
+	return (*s == '1' || *s == 'y' || *s == 'Y' || *s == 't' || *s == 'T') ?
+		1 : 0;
+}
+
+/*
+ * Look up the variable from the default environment
+ */
+char *env_get_default(const char *name)
+{
+	char *ret_val;
+	unsigned long really_valid = gd->env_valid;
+	unsigned long real_gd_flags = gd->flags;
+
+	/* Pretend that the image is bad. */
+	gd->flags &= ~GD_FLG_ENV_READY;
+	gd->env_valid = ENV_INVALID;
+	ret_val = env_get(name);
+	gd->env_valid = really_valid;
+	gd->flags = real_gd_flags;
+	return ret_val;
+}
+
+void env_set_default(const char *s, int flags)
+{
+	if (sizeof(default_environment) > ENV_SIZE) {
+		puts("*** Error - default environment is too large\n\n");
+		return;
+	}
+
+	if (s) {
+		if ((flags & H_INTERACTIVE) == 0) {
+			printf("*** Warning - %s, "
+				"using default environment\n\n", s);
+		} else {
+			puts(s);
+		}
+	} else {
+		debug("Using default environment\n");
+	}
+
+	if (himport_r(&env_htab, (char *)default_environment,
+			sizeof(default_environment), '\0', flags, 0,
+			0, NULL) == 0)
+		pr_err("## Error: Environment import failed: errno = %d\n",
+		       errno);
+
+	gd->flags |= GD_FLG_ENV_READY;
+	gd->flags |= GD_FLG_ENV_DEFAULT;
+}
+
+
+/* [re]set individual variables to their value in the default environment */
+int env_set_default_vars(int nvars, char * const vars[], int flags)
+{
+	/*
+	 * Special use-case: import from default environment
+	 * (and use \0 as a separator)
+	 */
+	flags |= H_NOCLEAR;
+	return himport_r(&env_htab, (const char *)default_environment,
+				sizeof(default_environment), '\0',
+				flags, 0, nvars, vars);
+}
+
+/*
+ * Check if CRC is valid and (if yes) import the environment.
+ * Note that "buf" may or may not be aligned.
+ */
+int env_import(const char *buf, int check)
+{
+	env_t *ep = (env_t *)buf;
+
+	if (check) {
+		uint32_t crc;
+
+		memcpy(&crc, &ep->crc, sizeof(crc));
+
+		if (crc32(0, ep->data, ENV_SIZE) != crc) {
+			env_set_default("bad CRC", 0);
+			return -ENOMSG; /* needed for env_load() */
+		}
+	}
+
+	if (himport_r(&env_htab, (char *)ep->data, ENV_SIZE, '\0', 0, 0,
+			0, NULL)) {
+		gd->flags |= GD_FLG_ENV_READY;
+		return 0;
+	}
+
+	pr_err("Cannot import environment: errno = %d\n", errno);
+
+	env_set_default("import failed", 0);
+
+	return -EIO;
+}
+
+#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
+static unsigned char env_flags;
+
+int env_import_redund(const char *buf1, int buf1_read_fail,
+		      const char *buf2, int buf2_read_fail)
+{
+	int crc1_ok, crc2_ok;
+	env_t *ep, *tmp_env1, *tmp_env2;
+
+	tmp_env1 = (env_t *)buf1;
+	tmp_env2 = (env_t *)buf2;
+
+	if (buf1_read_fail && buf2_read_fail) {
+		puts("*** Error - No Valid Environment Area found\n");
+	} else if (buf1_read_fail || buf2_read_fail) {
+		puts("*** Warning - some problems detected ");
+		puts("reading environment; recovered successfully\n");
+	}
+
+	if (buf1_read_fail && buf2_read_fail) {
+		env_set_default("bad env area", 0);
+		return -EIO;
+	} else if (!buf1_read_fail && buf2_read_fail) {
+		gd->env_valid = ENV_VALID;
+		return env_import((char *)tmp_env1, 1);
+	} else if (buf1_read_fail && !buf2_read_fail) {
+		gd->env_valid = ENV_REDUND;
+		return env_import((char *)tmp_env2, 1);
+	}
+
+	crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) ==
+			tmp_env1->crc;
+	crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) ==
+			tmp_env2->crc;
+
+	if (!crc1_ok && !crc2_ok) {
+		env_set_default("bad CRC", 0);
+		return -ENOMSG; /* needed for env_load() */
+	} else if (crc1_ok && !crc2_ok) {
+		gd->env_valid = ENV_VALID;
+	} else if (!crc1_ok && crc2_ok) {
+		gd->env_valid = ENV_REDUND;
+	} else {
+		/* both ok - check serial */
+		if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
+			gd->env_valid = ENV_REDUND;
+		else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
+			gd->env_valid = ENV_VALID;
+		else if (tmp_env1->flags > tmp_env2->flags)
+			gd->env_valid = ENV_VALID;
+		else if (tmp_env2->flags > tmp_env1->flags)
+			gd->env_valid = ENV_REDUND;
+		else /* flags are equal - almost impossible */
+			gd->env_valid = ENV_VALID;
+	}
+
+	if (gd->env_valid == ENV_VALID)
+		ep = tmp_env1;
+	else
+		ep = tmp_env2;
+
+	env_flags = ep->flags;
+	return env_import((char *)ep, 0);
+}
+#endif /* CONFIG_SYS_REDUNDAND_ENVIRONMENT */
+
+/* Export the environment and generate CRC for it. */
+int env_export(env_t *env_out)
+{
+	char *res;
+	ssize_t	len;
+
+	res = (char *)env_out->data;
+	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
+	if (len < 0) {
+		pr_err("Cannot export environment: errno = %d\n", errno);
+		return 1;
+	}
+
+	env_out->crc = crc32(0, env_out->data, ENV_SIZE);
+
+#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
+	env_out->flags = ++env_flags; /* increase the serial */
+#endif
+
+	return 0;
+}
+
+void env_relocate(void)
+{
+#if defined(CONFIG_NEEDS_MANUAL_RELOC)
+	env_reloc();
+	env_fix_drivers();
+	env_htab.change_ok += gd->reloc_off;
+#endif
+	if (gd->env_valid == ENV_INVALID) {
+#if defined(CONFIG_ENV_IS_NOWHERE) || defined(CONFIG_SPL_BUILD)
+		/* Environment not changable */
+		env_set_default(NULL, 0);
+#else
+		bootstage_error(BOOTSTAGE_ID_NET_CHECKSUM);
+		env_set_default("bad CRC", 0);
+#endif
+	} else {
+		env_load();
+	}
+}
+
+#ifdef CONFIG_AUTO_COMPLETE
+int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf,
+		 bool dollar_comp)
+{
+	struct env_entry *match;
+	int found, idx;
+
+	if (dollar_comp) {
+		/*
+		 * When doing $ completion, the first character should
+		 * obviously be a '$'.
+		 */
+		if (var[0] != '$')
+			return 0;
+
+		var++;
+
+		/*
+		 * The second one, if present, should be a '{', as some
+		 * configuration of the u-boot shell expand ${var} but not
+		 * $var.
+		 */
+		if (var[0] == '{')
+			var++;
+		else if (var[0] != '\0')
+			return 0;
+	}
+
+	idx = 0;
+	found = 0;
+	cmdv[0] = NULL;
+
+
+	while ((idx = hmatch_r(var, idx, &match, &env_htab))) {
+		int vallen = strlen(match->key) + 1;
+
+		if (found >= maxv - 2 ||
+		    bufsz < vallen + (dollar_comp ? 3 : 0))
+			break;
+
+		cmdv[found++] = buf;
+
+		/* Add the '${' prefix to each var when doing $ completion. */
+		if (dollar_comp) {
+			strcpy(buf, "${");
+			buf += 2;
+			bufsz -= 3;
+		}
+
+		memcpy(buf, match->key, vallen);
+		buf += vallen;
+		bufsz -= vallen;
+
+		if (dollar_comp) {
+			/*
+			 * This one is a bit odd: vallen already contains the
+			 * '\0' character but we need to add the '}' suffix,
+			 * hence the buf - 1 here. strcpy() will add the '\0'
+			 * character just after '}'. buf is then incremented
+			 * to account for the extra '}' we just added.
+			 */
+			strcpy(buf - 1, "}");
+			buf++;
+		}
+	}
+
+	qsort(cmdv, found, sizeof(cmdv[0]), strcmp_compar);
+
+	if (idx)
+		cmdv[found++] = dollar_comp ? "${...}" : "...";
+
+	cmdv[found] = NULL;
+	return found;
+}
+#endif

source/bootloader/u-boot-2020.01/env/eeprom.c

@@ -0,0 +1,240 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2000-2010
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Andreas Heppel <aheppel@sysgo.de>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <eeprom.h>
+#include <env.h>
+#include <env_internal.h>
+#include <linux/stddef.h>
+#include <u-boot/crc.h>
+#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
+#include <i2c.h>
+#endif
+#include <search.h>
+#include <errno.h>
+#include <linux/compiler.h>	/* for BUG_ON */
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int eeprom_bus_read(unsigned dev_addr, unsigned offset,
+			   uchar *buffer, unsigned cnt)
+{
+	int rcode;
+#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
+	int old_bus = i2c_get_bus_num();
+
+	if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS)
+		i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS);
+#endif
+
+	rcode = eeprom_read(dev_addr, offset, buffer, cnt);
+
+#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
+	i2c_set_bus_num(old_bus);
+#endif
+
+	return rcode;
+}
+
+static int eeprom_bus_write(unsigned dev_addr, unsigned offset,
+			    uchar *buffer, unsigned cnt)
+{
+	int rcode;
+#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
+	int old_bus = i2c_get_bus_num();
+
+	if (old_bus != CONFIG_I2C_ENV_EEPROM_BUS)
+		i2c_set_bus_num(CONFIG_I2C_ENV_EEPROM_BUS);
+#endif
+
+	rcode = eeprom_write(dev_addr, offset, buffer, cnt);
+
+#if defined(CONFIG_I2C_ENV_EEPROM_BUS)
+	i2c_set_bus_num(old_bus);
+#endif
+
+	return rcode;
+}
+
+/** Call this function from overridden env_get_char_spec() if you need
+ * this functionality.
+ */
+int env_eeprom_get_char(int index)
+{
+	uchar c;
+	unsigned int off = CONFIG_ENV_OFFSET;
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	if (gd->env_valid == ENV_REDUND)
+		off = CONFIG_ENV_OFFSET_REDUND;
+#endif
+	eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
+			off + index + offsetof(env_t, data), &c, 1);
+
+	return c;
+}
+
+static int env_eeprom_load(void)
+{
+	char buf_env[CONFIG_ENV_SIZE];
+	unsigned int off = CONFIG_ENV_OFFSET;
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	ulong len, crc[2], crc_tmp;
+	unsigned int off_env[2];
+	uchar rdbuf[64], flags[2];
+	int i, crc_ok[2] = {0, 0};
+
+	eeprom_init(-1);	/* prepare for EEPROM read/write */
+
+	off_env[0] = CONFIG_ENV_OFFSET;
+	off_env[1] = CONFIG_ENV_OFFSET_REDUND;
+
+	for (i = 0; i < 2; i++) {
+		/* read CRC */
+		eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
+				off_env[i] + offsetof(env_t, crc),
+				(uchar *)&crc[i], sizeof(ulong));
+		/* read FLAGS */
+		eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
+				off_env[i] + offsetof(env_t, flags),
+				(uchar *)&flags[i], sizeof(uchar));
+
+		crc_tmp = 0;
+		len = ENV_SIZE;
+		off = off_env[i] + offsetof(env_t, data);
+		while (len > 0) {
+			int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len;
+
+			eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off,
+					rdbuf, n);
+
+			crc_tmp = crc32(crc_tmp, rdbuf, n);
+			len -= n;
+			off += n;
+		}
+
+		if (crc_tmp == crc[i])
+			crc_ok[i] = 1;
+	}
+
+	if (!crc_ok[0] && !crc_ok[1]) {
+		gd->env_addr	= 0;
+		gd->env_valid = ENV_INVALID;
+	} else if (crc_ok[0] && !crc_ok[1]) {
+		gd->env_valid = ENV_VALID;
+	} else if (!crc_ok[0] && crc_ok[1]) {
+		gd->env_valid = ENV_REDUND;
+	} else {
+		/* both ok - check serial */
+		if (flags[0] == ENV_REDUND_ACTIVE &&
+		    flags[1] == ENV_REDUND_OBSOLETE)
+			gd->env_valid = ENV_VALID;
+		else if (flags[0] == ENV_REDUND_OBSOLETE &&
+			 flags[1] == ENV_REDUND_ACTIVE)
+			gd->env_valid = ENV_REDUND;
+		else if (flags[0] == 0xFF && flags[1] == 0)
+			gd->env_valid = ENV_REDUND;
+		else if (flags[1] == 0xFF && flags[0] == 0)
+			gd->env_valid = ENV_VALID;
+		else /* flags are equal - almost impossible */
+			gd->env_valid = ENV_VALID;
+	}
+
+#else /* CONFIG_ENV_OFFSET_REDUND */
+	ulong crc, len, new;
+	uchar rdbuf[64];
+
+	eeprom_init(-1);	/* prepare for EEPROM read/write */
+
+	/* read old CRC */
+	eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
+			CONFIG_ENV_OFFSET + offsetof(env_t, crc),
+			(uchar *)&crc, sizeof(ulong));
+
+	new = 0;
+	len = ENV_SIZE;
+	off = offsetof(env_t, data);
+	while (len > 0) {
+		int n = (len > sizeof(rdbuf)) ? sizeof(rdbuf) : len;
+
+		eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
+				CONFIG_ENV_OFFSET + off, rdbuf, n);
+		new = crc32(new, rdbuf, n);
+		len -= n;
+		off += n;
+	}
+
+	if (crc == new) {
+		gd->env_valid = ENV_VALID;
+	} else {
+		gd->env_valid = ENV_INVALID;
+	}
+#endif /* CONFIG_ENV_OFFSET_REDUND */
+
+	off = CONFIG_ENV_OFFSET;
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	if (gd->env_valid == ENV_REDUND)
+		off = CONFIG_ENV_OFFSET_REDUND;
+#endif
+
+	eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
+		off, (uchar *)buf_env, CONFIG_ENV_SIZE);
+
+	return env_import(buf_env, 1);
+}
+
+static int env_eeprom_save(void)
+{
+	env_t	env_new;
+	int	rc;
+	unsigned int off	= CONFIG_ENV_OFFSET;
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	unsigned int off_red	= CONFIG_ENV_OFFSET_REDUND;
+	char flag_obsolete	= ENV_REDUND_OBSOLETE;
+#endif
+
+	rc = env_export(&env_new);
+	if (rc)
+		return rc;
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	if (gd->env_valid == ENV_VALID) {
+		off	= CONFIG_ENV_OFFSET_REDUND;
+		off_red	= CONFIG_ENV_OFFSET;
+	}
+
+	env_new.flags = ENV_REDUND_ACTIVE;
+#endif
+
+	rc = eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR,
+			      off, (uchar *)&env_new, CONFIG_ENV_SIZE);
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	if (rc == 0) {
+		eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR,
+				 off_red + offsetof(env_t, flags),
+				 (uchar *)&flag_obsolete, 1);
+
+		if (gd->env_valid == ENV_VALID)
+			gd->env_valid = ENV_REDUND;
+		else
+			gd->env_valid = ENV_VALID;
+	}
+#endif
+	return rc;
+}
+
+U_BOOT_ENV_LOCATION(eeprom) = {
+	.location	= ENVL_EEPROM,
+	ENV_NAME("EEPROM")
+	.load		= env_eeprom_load,
+	.save		= env_save_ptr(env_eeprom_save),
+};

source/bootloader/u-boot-2020.01/env/embedded.c

@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2001
+ * Erik Theisen,  Wave 7 Optics, etheisen@mindspring.com.
+ */
+
+#include <linux/kconfig.h>
+
+#ifndef __ASSEMBLY__
+#define	__ASSEMBLY__			/* Dirty trick to get only #defines */
+#endif
+#define	__ASM_STUB_PROCESSOR_H__	/* don't include asm/processor. */
+#include <config.h>
+#undef	__ASSEMBLY__
+#include <env_internal.h>
+#include <linux/stringify.h>
+
+/* Handle HOSTS that have prepended crap on symbol names, not TARGETS. */
+#if defined(__APPLE__)
+/* Leading underscore on symbols */
+#  define SYM_CHAR "_"
+#else /* No leading character on symbols */
+#  define SYM_CHAR
+#endif
+
+/*
+ * Generate embedded environment table
+ * inside U-Boot image, if needed.
+ */
+#if defined(ENV_IS_EMBEDDED) || defined(CONFIG_BUILD_ENVCRC)
+/*
+ * Put the environment in the .text section when we are building
+ * U-Boot proper.  The host based program "tools/envcrc" does not need
+ * a seperate section.
+ */
+#if defined(USE_HOSTCC) /* Native for 'tools/envcrc' */
+#  define __UBOOT_ENV_SECTION__(name)	/*XXX DO_NOT_DEL_THIS_COMMENT*/
+
+#else /* Environment is embedded in U-Boot's .text section */
+/* XXX - This only works with GNU C */
+#  define __UBOOT_ENV_SECTION__(name)	__attribute__ ((section(".text."#name)))
+#endif
+
+/*
+ * Macros to generate global absolutes.
+ */
+#if defined(__bfin__)
+# define GEN_SET_VALUE(name, value)	\
+	asm(".set " GEN_SYMNAME(name) ", " GEN_VALUE(value))
+#else
+# define GEN_SET_VALUE(name, value)	\
+	asm(GEN_SYMNAME(name) " = " GEN_VALUE(value))
+#endif
+#define GEN_SYMNAME(str)	SYM_CHAR #str
+#define GEN_VALUE(str)		#str
+#define GEN_ABS(name, value)			\
+	asm(".globl " GEN_SYMNAME(name));	\
+	GEN_SET_VALUE(name, value)
+
+/*
+ * Check to see if we are building with a
+ * computed CRC.  Otherwise define it as ~0.
+ */
+#if !defined(ENV_CRC)
+#  define ENV_CRC	(~0)
+#endif
+
+#define DEFAULT_ENV_INSTANCE_EMBEDDED
+#include <env_default.h>
+
+#ifdef CONFIG_ENV_ADDR_REDUND
+env_t redundand_environment __UBOOT_ENV_SECTION__(redundand_environment) = {
+	0,		/* CRC Sum: invalid */
+	0,		/* Flags:   invalid */
+	{
+	"\0"
+	}
+};
+#endif	/* CONFIG_ENV_ADDR_REDUND */
+
+/*
+ * These will end up in the .text section
+ * if the environment strings are embedded
+ * in the image.  When this is used for
+ * tools/envcrc, they are placed in the
+ * .data/.sdata section.
+ *
+ */
+unsigned long env_size __UBOOT_ENV_SECTION__(env_size) = sizeof(env_t);
+
+/*
+ * Add in absolutes.
+ */
+GEN_ABS(env_offset, (CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE));
+
+#endif /* ENV_IS_EMBEDDED */

source/bootloader/u-boot-2020.01/env/env.c

@@ -0,0 +1,328 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <env.h>
+#include <env_internal.h>
+
+#include <linux/lotus/timestamp.h>
+#include <linux/lotus/step.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#if defined(CONFIG_NEEDS_MANUAL_RELOC)
+void env_fix_drivers(void)
+{
+	struct env_driver *drv;
+	const int n_ents = ll_entry_count(struct env_driver, env_driver);
+	struct env_driver *entry;
+
+	drv = ll_entry_start(struct env_driver, env_driver);
+	for (entry = drv; entry != drv + n_ents; entry++) {
+		if (entry->name)
+			entry->name += gd->reloc_off;
+		if (entry->load)
+			entry->load += gd->reloc_off;
+		if (entry->save)
+			entry->save += gd->reloc_off;
+		if (entry->erase)
+			entry->erase += gd->reloc_off;
+		if (entry->init)
+			entry->init += gd->reloc_off;
+	}
+}
+#endif
+
+static struct env_driver *_env_driver_lookup(enum env_location loc)
+{
+	struct env_driver *drv;
+	const int n_ents = ll_entry_count(struct env_driver, env_driver);
+	struct env_driver *entry;
+
+	drv = ll_entry_start(struct env_driver, env_driver);
+	for (entry = drv; entry != drv + n_ents; entry++) {
+		if (loc == entry->location)
+			return entry;
+	}
+
+	/* Not found */
+	return NULL;
+}
+
+static enum env_location env_locations[] = {
+#ifdef CONFIG_ENV_IS_IN_EEPROM
+	ENVL_EEPROM,
+#endif
+#ifdef CONFIG_ENV_IS_IN_EXT4
+	ENVL_EXT4,
+#endif
+#ifdef CONFIG_ENV_IS_IN_FAT
+	ENVL_FAT,
+#endif
+#ifdef CONFIG_ENV_IS_IN_FLASH
+	ENVL_FLASH,
+#endif
+#ifdef CONFIG_ENV_IS_IN_MMC
+	ENVL_MMC,
+#endif
+#ifdef CONFIG_ENV_IS_IN_NAND
+	ENVL_NAND,
+#endif
+#ifdef CONFIG_ENV_IS_IN_NVRAM
+	ENVL_NVRAM,
+#endif
+#ifdef CONFIG_ENV_IS_IN_REMOTE
+	ENVL_REMOTE,
+#endif
+#ifdef CONFIG_ENV_IS_IN_SATA
+	ENVL_ESATA,
+#endif
+#ifdef CONFIG_ENV_IS_IN_SPI_FLASH
+	ENVL_SPI_FLASH,
+#endif
+#ifdef CONFIG_ENV_IS_IN_UBI
+	ENVL_UBI,
+#endif
+#ifdef CONFIG_ENV_IS_NOWHERE
+	ENVL_NOWHERE,
+#endif
+};
+
+static bool env_has_inited(enum env_location location)
+{
+	return gd->env_has_init & BIT(location);
+}
+
+static void env_set_inited(enum env_location location)
+{
+	/*
+	 * We're using a 32-bits bitmask stored in gd (env_has_init)
+	 * using the above enum value as the bit index. We need to
+	 * make sure that we're not overflowing it.
+	 */
+	BUILD_BUG_ON(ARRAY_SIZE(env_locations) > BITS_PER_LONG);
+
+	gd->env_has_init |= BIT(location);
+}
+
+/**
+ * env_get_location() - Returns the best env location for a board
+ * @op: operations performed on the environment
+ * @prio: priority between the multiple environments, 0 being the
+ *        highest priority
+ *
+ * This will return the preferred environment for the given priority.
+ * This is overridable by boards if they need to.
+ *
+ * All implementations are free to use the operation, the priority and
+ * any other data relevant to their choice, but must take into account
+ * the fact that the lowest prority (0) is the most important location
+ * in the system. The following locations should be returned by order
+ * of descending priorities, from the highest to the lowest priority.
+ *
+ * Returns:
+ * an enum env_location value on success, a negative error code otherwise
+ */
+__weak enum env_location env_get_location(enum env_operation op, int prio)
+{
+	if (prio >= ARRAY_SIZE(env_locations))
+		return ENVL_UNKNOWN;
+
+	gd->env_load_prio = prio;
+
+	return env_locations[prio];
+}
+
+
+/**
+ * env_driver_lookup() - Finds the most suited environment location
+ * @op: operations performed on the environment
+ * @prio: priority between the multiple environments, 0 being the
+ *        highest priority
+ *
+ * This will try to find the available environment with the highest
+ * priority in the system.
+ *
+ * Returns:
+ * NULL on error, a pointer to a struct env_driver otherwise
+ */
+static struct env_driver *env_driver_lookup(enum env_operation op, int prio)
+{
+	enum env_location loc = env_get_location(op, prio);
+	struct env_driver *drv;
+
+	if (loc == ENVL_UNKNOWN)
+		return NULL;
+
+	drv = _env_driver_lookup(loc);
+	if (!drv) {
+		debug("%s: No environment driver for location %d\n", __func__,
+		      loc);
+		return NULL;
+	}
+
+	return drv;
+}
+
+__weak int env_get_char_spec(int index)
+{
+	return *(uchar *)(gd->env_addr + index);
+}
+
+int env_get_char(int index)
+{
+	if (gd->env_valid == ENV_INVALID)
+		return default_environment[index];
+	else
+		return env_get_char_spec(index);
+}
+
+int env_load(void)
+{
+	struct env_driver *drv;
+	int best_prio = -1;
+	int prio;
+
+	TIME_STAMP(0);
+
+	for (prio = 0; (drv = env_driver_lookup(ENVOP_LOAD, prio)); prio++) {
+		int ret;
+
+		if (!drv->load)
+			continue;
+
+		if (!env_has_inited(drv->location))
+			continue;
+
+		printf("Loading Environment from %s... ", drv->name);
+		/*
+		 * In error case, the error message must be printed during
+		 * drv->load() in some underlying API, and it must be exactly
+		 * one message.
+		 */
+		ret = drv->load();
+		if (!ret) {
+			printf("OK\n");
+			TIME_STAMP(0);
+			return 0;
+		} else if (ret == -ENOMSG) {
+			/* Handle "bad CRC" case */
+			if (best_prio == -1)
+				best_prio = prio;
+		} else {
+			debug("Failed (%d)\n", ret);
+		}
+	}
+
+	/*
+	 * In case of invalid environment, we set the 'default' env location
+	 * to the best choice, i.e.:
+	 *   1. Environment location with bad CRC, if such location was found
+	 *   2. Otherwise use the location with highest priority
+	 *
+	 * This way, next calls to env_save() will restore the environment
+	 * at the right place.
+	 */
+	if (best_prio >= 0)
+		debug("Selecting environment with bad CRC\n");
+	else
+		best_prio = 0;
+	env_get_location(ENVOP_LOAD, best_prio);
+
+	TIME_STAMP(0);
+
+	return -ENODEV;
+}
+
+int env_save(void)
+{
+	struct env_driver *drv;
+
+	drv = env_driver_lookup(ENVOP_SAVE, gd->env_load_prio);
+	if (drv) {
+		int ret;
+
+		if (!drv->save)
+			return -ENODEV;
+
+		if (!env_has_inited(drv->location))
+			return -ENODEV;
+
+		printf("Saving Environment to %s... ", drv->name);
+		ret = drv->save();
+		if (ret)
+			printf("Failed (%d)\n", ret);
+		else
+			printf("OK\n");
+
+		if (!ret)
+			return 0;
+	}
+
+	return -ENODEV;
+}
+
+int env_erase(void)
+{
+	struct env_driver *drv;
+
+	drv = env_driver_lookup(ENVOP_ERASE, gd->env_load_prio);
+	if (drv) {
+		int ret;
+
+		if (!drv->erase)
+			return -ENODEV;
+
+		if (!env_has_inited(drv->location))
+			return -ENODEV;
+
+		printf("Erasing Environment on %s... ", drv->name);
+		ret = drv->erase();
+		if (ret)
+			printf("Failed (%d)\n", ret);
+		else
+			printf("OK\n");
+
+		if (!ret)
+			return 0;
+	}
+
+	return -ENODEV;
+}
+
+int env_init(void)
+{
+	struct env_driver *drv;
+	int ret = -ENOENT;
+	int prio;
+
+	step(55);
+	TIME_STAMP(0);
+
+	for (prio = 0; (drv = env_driver_lookup(ENVOP_INIT, prio)); prio++) {
+		if (!drv->init || !(ret = drv->init()))
+			env_set_inited(drv->location);
+
+		debug("%s: Environment %s init done (ret=%d)\n", __func__,
+		      drv->name, ret);
+	}
+
+	if (!prio)
+		return -ENODEV;
+
+	if (ret == -ENOENT) {
+		gd->env_addr = (ulong)&default_environment[0];
+		gd->env_valid = ENV_VALID;
+
+		TIME_STAMP(0);
+
+		return 0;
+	}
+
+	step(56);
+	TIME_STAMP(0);
+	return ret;
+}

source/bootloader/u-boot-2020.01/env/ext4.c

@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (c) Copyright 2016 by VRT Technology
+ *
+ * Author:
+ *  Stuart Longland <stuartl@vrt.com.au>
+ *
+ * Based on FAT environment driver
+ * (c) Copyright 2011 by Tigris Elektronik GmbH
+ *
+ * Author:
+ *  Maximilian Schwerin <mvs@tigris.de>
+ *
+ * and EXT4 filesystem implementation
+ * (C) Copyright 2011 - 2012 Samsung Electronics
+ * EXT4 filesystem implementation in Uboot by
+ * Uma Shankar <uma.shankar@samsung.com>
+ * Manjunatha C Achar <a.manjunatha@samsung.com>
+ */
+
+#include <common.h>
+
+#include <command.h>
+#include <env.h>
+#include <env_internal.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+#include <memalign.h>
+#include <search.h>
+#include <errno.h>
+#include <ext4fs.h>
+#include <mmc.h>
+
+__weak const char *env_ext4_get_intf(void)
+{
+	return (const char *)CONFIG_ENV_EXT4_INTERFACE;
+}
+
+__weak const char *env_ext4_get_dev_part(void)
+{
+	return (const char *)CONFIG_ENV_EXT4_DEVICE_AND_PART;
+}
+
+#ifdef CONFIG_CMD_SAVEENV
+static int env_ext4_save(void)
+{
+	env_t	env_new;
+	struct blk_desc *dev_desc = NULL;
+	disk_partition_t info;
+	int dev, part;
+	int err;
+	const char *ifname = env_ext4_get_intf();
+	const char *dev_and_part = env_ext4_get_dev_part();
+
+	err = env_export(&env_new);
+	if (err)
+		return err;
+
+	part = blk_get_device_part_str(ifname, dev_and_part,
+				       &dev_desc, &info, 1);
+	if (part < 0)
+		return 1;
+
+	dev = dev_desc->devnum;
+	ext4fs_set_blk_dev(dev_desc, &info);
+
+	if (!ext4fs_mount(info.size)) {
+		printf("\n** Unable to use %s %s for saveenv **\n",
+		       ifname, dev_and_part);
+		return 1;
+	}
+
+	err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)&env_new,
+			   sizeof(env_t), FILETYPE_REG);
+	ext4fs_close();
+
+	if (err == -1) {
+		printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
+			CONFIG_ENV_EXT4_FILE, ifname, dev, part);
+		return 1;
+	}
+
+	puts("done\n");
+	return 0;
+}
+#endif /* CONFIG_CMD_SAVEENV */
+
+static int env_ext4_load(void)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
+	struct blk_desc *dev_desc = NULL;
+	disk_partition_t info;
+	int dev, part;
+	int err;
+	loff_t off;
+	const char *ifname = env_ext4_get_intf();
+	const char *dev_and_part = env_ext4_get_dev_part();
+
+#ifdef CONFIG_MMC
+	if (!strcmp(ifname, "mmc"))
+		mmc_initialize(NULL);
+#endif
+
+	part = blk_get_device_part_str(ifname, dev_and_part,
+				       &dev_desc, &info, 1);
+	if (part < 0)
+		goto err_env_relocate;
+
+	dev = dev_desc->devnum;
+	ext4fs_set_blk_dev(dev_desc, &info);
+
+	if (!ext4fs_mount(info.size)) {
+		printf("\n** Unable to use %s %s for loading the env **\n",
+		       ifname, dev_and_part);
+		goto err_env_relocate;
+	}
+
+	err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
+			     &off);
+	ext4fs_close();
+
+	if (err == -1) {
+		printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
+			CONFIG_ENV_EXT4_FILE, ifname, dev, part);
+		goto err_env_relocate;
+	}
+
+	return env_import(buf, 1);
+
+err_env_relocate:
+	env_set_default(NULL, 0);
+
+	return -EIO;
+}
+
+U_BOOT_ENV_LOCATION(ext4) = {
+	.location	= ENVL_EXT4,
+	ENV_NAME("EXT4")
+	.load		= env_ext4_load,
+	.save		= env_save_ptr(env_ext4_save),
+};

source/bootloader/u-boot-2020.01/env/fat.c

@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (c) Copyright 2011 by Tigris Elektronik GmbH
+ *
+ * Author:
+ *  Maximilian Schwerin <mvs@tigris.de>
+ */
+
+#include <common.h>
+
+#include <command.h>
+#include <env.h>
+#include <env_internal.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+#include <memalign.h>
+#include <search.h>
+#include <errno.h>
+#include <fat.h>
+#include <mmc.h>
+
+#ifdef CONFIG_SPL_BUILD
+/* TODO(sjg@chromium.org): Figure out why this is needed */
+# if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT)
+#  define LOADENV
+# endif
+#else
+# define LOADENV
+# if defined(CONFIG_CMD_SAVEENV)
+#  define CMD_SAVEENV
+# endif
+#endif
+
+#ifdef CMD_SAVEENV
+static int env_fat_save(void)
+{
+	env_t __aligned(ARCH_DMA_MINALIGN) env_new;
+	struct blk_desc *dev_desc = NULL;
+	disk_partition_t info;
+	int dev, part;
+	int err;
+	loff_t size;
+
+	err = env_export(&env_new);
+	if (err)
+		return err;
+
+	part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
+					CONFIG_ENV_FAT_DEVICE_AND_PART,
+					&dev_desc, &info, 1);
+	if (part < 0)
+		return 1;
+
+	dev = dev_desc->devnum;
+	if (fat_set_blk_dev(dev_desc, &info) != 0) {
+		/*
+		 * This printf is embedded in the messages from env_save that
+		 * will calling it. The missing \n is intentional.
+		 */
+		printf("Unable to use %s %d:%d... ",
+		       CONFIG_ENV_FAT_INTERFACE, dev, part);
+		return 1;
+	}
+
+	err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
+			     &size);
+	if (err == -1) {
+		/*
+		 * This printf is embedded in the messages from env_save that
+		 * will calling it. The missing \n is intentional.
+		 */
+		printf("Unable to write \"%s\" from %s%d:%d... ",
+			CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
+		return 1;
+	}
+
+	return 0;
+}
+#endif /* CMD_SAVEENV */
+
+#ifdef LOADENV
+static int env_fat_load(void)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
+	struct blk_desc *dev_desc = NULL;
+	disk_partition_t info;
+	int dev, part;
+	int err;
+
+#ifdef CONFIG_MMC
+	if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc"))
+		mmc_initialize(NULL);
+#endif
+
+	part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
+					CONFIG_ENV_FAT_DEVICE_AND_PART,
+					&dev_desc, &info, 1);
+	if (part < 0)
+		goto err_env_relocate;
+
+	dev = dev_desc->devnum;
+	if (fat_set_blk_dev(dev_desc, &info) != 0) {
+		/*
+		 * This printf is embedded in the messages from env_save that
+		 * will calling it. The missing \n is intentional.
+		 */
+		printf("Unable to use %s %d:%d... ",
+		       CONFIG_ENV_FAT_INTERFACE, dev, part);
+		goto err_env_relocate;
+	}
+
+	err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
+	if (err == -1) {
+		/*
+		 * This printf is embedded in the messages from env_save that
+		 * will calling it. The missing \n is intentional.
+		 */
+		printf("Unable to read \"%s\" from %s%d:%d... ",
+			CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
+		goto err_env_relocate;
+	}
+
+	return env_import(buf, 1);
+
+err_env_relocate:
+	env_set_default(NULL, 0);
+
+	return -EIO;
+}
+#endif /* LOADENV */
+
+U_BOOT_ENV_LOCATION(fat) = {
+	.location	= ENVL_FAT,
+	ENV_NAME("FAT")
+#ifdef LOADENV
+	.load		= env_fat_load,
+#endif
+#ifdef CMD_SAVEENV
+	.save		= env_save_ptr(env_fat_save),
+#endif
+};

source/bootloader/u-boot-2020.01/env/flags.c

@@ -0,0 +1,567 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2012
+ * Joe Hershberger, National Instruments, joe.hershberger@ni.com
+ */
+
+#include <env.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+
+#ifdef USE_HOSTCC /* Eliminate "ANSI does not permit..." warnings */
+#include <stdint.h>
+#include <stdio.h>
+#include "fw_env_private.h"
+#include "fw_env.h"
+#include <env_attr.h>
+#include <env_flags.h>
+#define env_get fw_getenv
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+#else
+#include <common.h>
+#include <env_internal.h>
+#endif
+
+#ifdef CONFIG_CMD_NET
+#define ENV_FLAGS_NET_VARTYPE_REPS "im"
+#else
+#define ENV_FLAGS_NET_VARTYPE_REPS ""
+#endif
+
+static const char env_flags_vartype_rep[] = "sdxb" ENV_FLAGS_NET_VARTYPE_REPS;
+static const char env_flags_varaccess_rep[] = "aroc";
+static const int env_flags_varaccess_mask[] = {
+	0,
+	ENV_FLAGS_VARACCESS_PREVENT_DELETE |
+		ENV_FLAGS_VARACCESS_PREVENT_CREATE |
+		ENV_FLAGS_VARACCESS_PREVENT_OVERWR,
+	ENV_FLAGS_VARACCESS_PREVENT_DELETE |
+		ENV_FLAGS_VARACCESS_PREVENT_OVERWR,
+	ENV_FLAGS_VARACCESS_PREVENT_DELETE |
+		ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR};
+
+#ifdef CONFIG_CMD_ENV_FLAGS
+static const char * const env_flags_vartype_names[] = {
+	"string",
+	"decimal",
+	"hexadecimal",
+	"boolean",
+#ifdef CONFIG_CMD_NET
+	"IP address",
+	"MAC address",
+#endif
+};
+static const char * const env_flags_varaccess_names[] = {
+	"any",
+	"read-only",
+	"write-once",
+	"change-default",
+};
+
+/*
+ * Print the whole list of available type flags.
+ */
+void env_flags_print_vartypes(void)
+{
+	enum env_flags_vartype curtype = (enum env_flags_vartype)0;
+
+	while (curtype != env_flags_vartype_end) {
+		printf("\t%c   -\t%s\n", env_flags_vartype_rep[curtype],
+			env_flags_vartype_names[curtype]);
+		curtype++;
+	}
+}
+
+/*
+ * Print the whole list of available access flags.
+ */
+void env_flags_print_varaccess(void)
+{
+	enum env_flags_varaccess curaccess = (enum env_flags_varaccess)0;
+
+	while (curaccess != env_flags_varaccess_end) {
+		printf("\t%c   -\t%s\n", env_flags_varaccess_rep[curaccess],
+			env_flags_varaccess_names[curaccess]);
+		curaccess++;
+	}
+}
+
+/*
+ * Return the name of the type.
+ */
+const char *env_flags_get_vartype_name(enum env_flags_vartype type)
+{
+	return env_flags_vartype_names[type];
+}
+
+/*
+ * Return the name of the access.
+ */
+const char *env_flags_get_varaccess_name(enum env_flags_varaccess access)
+{
+	return env_flags_varaccess_names[access];
+}
+#endif /* CONFIG_CMD_ENV_FLAGS */
+
+/*
+ * Parse the flags string from a .flags attribute list into the vartype enum.
+ */
+enum env_flags_vartype env_flags_parse_vartype(const char *flags)
+{
+	char *type;
+
+	if (strlen(flags) <= ENV_FLAGS_VARTYPE_LOC)
+		return env_flags_vartype_string;
+
+	type = strchr(env_flags_vartype_rep,
+		flags[ENV_FLAGS_VARTYPE_LOC]);
+
+	if (type != NULL)
+		return (enum env_flags_vartype)
+			(type - &env_flags_vartype_rep[0]);
+
+	printf("## Warning: Unknown environment variable type '%c'\n",
+		flags[ENV_FLAGS_VARTYPE_LOC]);
+	return env_flags_vartype_string;
+}
+
+/*
+ * Parse the flags string from a .flags attribute list into the varaccess enum.
+ */
+enum env_flags_varaccess env_flags_parse_varaccess(const char *flags)
+{
+	char *access;
+
+	if (strlen(flags) <= ENV_FLAGS_VARACCESS_LOC)
+		return env_flags_varaccess_any;
+
+	access = strchr(env_flags_varaccess_rep,
+		flags[ENV_FLAGS_VARACCESS_LOC]);
+
+	if (access != NULL)
+		return (enum env_flags_varaccess)
+			(access - &env_flags_varaccess_rep[0]);
+
+	printf("## Warning: Unknown environment variable access method '%c'\n",
+		flags[ENV_FLAGS_VARACCESS_LOC]);
+	return env_flags_varaccess_any;
+}
+
+/*
+ * Parse the binary flags from a hash table entry into the varaccess enum.
+ */
+enum env_flags_varaccess env_flags_parse_varaccess_from_binflags(int binflags)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(env_flags_varaccess_mask); i++)
+		if (env_flags_varaccess_mask[i] ==
+		    (binflags & ENV_FLAGS_VARACCESS_BIN_MASK))
+			return (enum env_flags_varaccess)i;
+
+	printf("Warning: Non-standard access flags. (0x%x)\n",
+		binflags & ENV_FLAGS_VARACCESS_BIN_MASK);
+
+	return env_flags_varaccess_any;
+}
+
+static inline int is_hex_prefix(const char *value)
+{
+	return value[0] == '0' && (value[1] == 'x' || value[1] == 'X');
+}
+
+static void skip_num(int hex, const char *value, const char **end,
+	int max_digits)
+{
+	int i;
+
+	if (hex && is_hex_prefix(value))
+		value += 2;
+
+	for (i = max_digits; i != 0; i--) {
+		if (hex && !isxdigit(*value))
+			break;
+		if (!hex && !isdigit(*value))
+			break;
+		value++;
+	}
+	if (end != NULL)
+		*end = value;
+}
+
+#ifdef CONFIG_CMD_NET
+int eth_validate_ethaddr_str(const char *addr)
+{
+	const char *end;
+	const char *cur;
+	int i;
+
+	cur = addr;
+	for (i = 0; i < 6; i++) {
+		skip_num(1, cur, &end, 2);
+		if (cur == end)
+			return -1;
+		if (cur + 2 == end && is_hex_prefix(cur))
+			return -1;
+		if (i != 5 && *end != ':')
+			return -1;
+		if (i == 5 && *end != '\0')
+			return -1;
+		cur = end + 1;
+	}
+
+	return 0;
+}
+#endif
+
+/*
+ * Based on the declared type enum, validate that the value string complies
+ * with that format
+ */
+static int _env_flags_validate_type(const char *value,
+	enum env_flags_vartype type)
+{
+	const char *end;
+#ifdef CONFIG_CMD_NET
+	const char *cur;
+	int i;
+#endif
+
+	switch (type) {
+	case env_flags_vartype_string:
+		break;
+	case env_flags_vartype_decimal:
+		skip_num(0, value, &end, -1);
+		if (*end != '\0')
+			return -1;
+		break;
+	case env_flags_vartype_hex:
+		skip_num(1, value, &end, -1);
+		if (*end != '\0')
+			return -1;
+		if (value + 2 == end && is_hex_prefix(value))
+			return -1;
+		break;
+	case env_flags_vartype_bool:
+		if (value[0] != '1' && value[0] != 'y' && value[0] != 't' &&
+		    value[0] != 'Y' && value[0] != 'T' &&
+		    value[0] != '0' && value[0] != 'n' && value[0] != 'f' &&
+		    value[0] != 'N' && value[0] != 'F')
+			return -1;
+		if (value[1] != '\0')
+			return -1;
+		break;
+#ifdef CONFIG_CMD_NET
+	case env_flags_vartype_ipaddr:
+		cur = value;
+		for (i = 0; i < 4; i++) {
+			skip_num(0, cur, &end, 3);
+			if (cur == end)
+				return -1;
+			if (i != 3 && *end != '.')
+				return -1;
+			if (i == 3 && *end != '\0')
+				return -1;
+			cur = end + 1;
+		}
+		break;
+	case env_flags_vartype_macaddr:
+		if (eth_validate_ethaddr_str(value))
+			return -1;
+		break;
+#endif
+	case env_flags_vartype_end:
+		return -1;
+	}
+
+	/* OK */
+	return 0;
+}
+
+/*
+ * Look for flags in a provided list and failing that the static list
+ */
+static inline int env_flags_lookup(const char *flags_list, const char *name,
+	char *flags)
+{
+	int ret = 1;
+
+	if (!flags)
+		/* bad parameter */
+		return -1;
+
+	/* try the env first */
+	if (flags_list)
+		ret = env_attr_lookup(flags_list, name, flags);
+
+	if (ret != 0)
+		/* if not found in the env, look in the static list */
+		ret = env_attr_lookup(ENV_FLAGS_LIST_STATIC, name, flags);
+
+	return ret;
+}
+
+#ifdef USE_HOSTCC /* Functions only used from tools/env */
+/*
+ * Look up any flags directly from the .flags variable and the static list
+ * and convert them to the vartype enum.
+ */
+enum env_flags_vartype env_flags_get_type(const char *name)
+{
+	const char *flags_list = env_get(ENV_FLAGS_VAR);
+	char flags[ENV_FLAGS_ATTR_MAX_LEN + 1];
+
+	if (env_flags_lookup(flags_list, name, flags))
+		return env_flags_vartype_string;
+
+	if (strlen(flags) <= ENV_FLAGS_VARTYPE_LOC)
+		return env_flags_vartype_string;
+
+	return env_flags_parse_vartype(flags);
+}
+
+/*
+ * Look up the access of a variable directly from the .flags var.
+ */
+enum env_flags_varaccess env_flags_get_varaccess(const char *name)
+{
+	const char *flags_list = env_get(ENV_FLAGS_VAR);
+	char flags[ENV_FLAGS_ATTR_MAX_LEN + 1];
+
+	if (env_flags_lookup(flags_list, name, flags))
+		return env_flags_varaccess_any;
+
+	if (strlen(flags) <= ENV_FLAGS_VARACCESS_LOC)
+		return env_flags_varaccess_any;
+
+	return env_flags_parse_varaccess(flags);
+}
+
+/*
+ * Validate that the proposed new value for "name" is valid according to the
+ * defined flags for that variable, if any.
+ */
+int env_flags_validate_type(const char *name, const char *value)
+{
+	enum env_flags_vartype type;
+
+	if (value == NULL)
+		return 0;
+	type = env_flags_get_type(name);
+	if (_env_flags_validate_type(value, type) < 0) {
+		printf("## Error: flags type check failure for "
+			"\"%s\" <= \"%s\" (type: %c)\n",
+			name, value, env_flags_vartype_rep[type]);
+		return -1;
+	}
+	return 0;
+}
+
+/*
+ * Validate that the proposed access to variable "name" is valid according to
+ * the defined flags for that variable, if any.
+ */
+int env_flags_validate_varaccess(const char *name, int check_mask)
+{
+	enum env_flags_varaccess access;
+	int access_mask;
+
+	access = env_flags_get_varaccess(name);
+	access_mask = env_flags_varaccess_mask[access];
+
+	return (check_mask & access_mask) != 0;
+}
+
+/*
+ * Validate the parameters to "env set" directly
+ */
+int env_flags_validate_env_set_params(char *name, char * const val[], int count)
+{
+	if ((count >= 1) && val[0] != NULL) {
+		enum env_flags_vartype type = env_flags_get_type(name);
+
+		/*
+		 * we don't currently check types that need more than
+		 * one argument
+		 */
+		if (type != env_flags_vartype_string && count > 1) {
+			printf("## Error: too many parameters for setting \"%s\"\n",
+			       name);
+			return -1;
+		}
+		return env_flags_validate_type(name, val[0]);
+	}
+	/* ok */
+	return 0;
+}
+
+#else /* !USE_HOSTCC - Functions only used from lib/hashtable.c */
+
+/*
+ * Parse the flag charachters from the .flags attribute list into the binary
+ * form to be stored in the environment entry->flags field.
+ */
+static int env_parse_flags_to_bin(const char *flags)
+{
+	int binflags;
+
+	binflags = env_flags_parse_vartype(flags) & ENV_FLAGS_VARTYPE_BIN_MASK;
+	binflags |= env_flags_varaccess_mask[env_flags_parse_varaccess(flags)];
+
+	return binflags;
+}
+
+static int first_call = 1;
+static const char *flags_list;
+
+/*
+ * Look for possible flags for a newly added variable
+ * This is called specifically when the variable did not exist in the hash
+ * previously, so the blanket update did not find this variable.
+ */
+void env_flags_init(struct env_entry *var_entry)
+{
+	const char *var_name = var_entry->key;
+	char flags[ENV_FLAGS_ATTR_MAX_LEN + 1] = "";
+	int ret = 1;
+
+	if (first_call) {
+		flags_list = env_get(ENV_FLAGS_VAR);
+		first_call = 0;
+	}
+	/* look in the ".flags" and static for a reference to this variable */
+	ret = env_flags_lookup(flags_list, var_name, flags);
+
+	/* if any flags were found, set the binary form to the entry */
+	if (!ret && strlen(flags))
+		var_entry->flags = env_parse_flags_to_bin(flags);
+}
+
+/*
+ * Called on each existing env var prior to the blanket update since removing
+ * a flag in the flag list should remove its flags.
+ */
+static int clear_flags(struct env_entry *entry)
+{
+	entry->flags = 0;
+
+	return 0;
+}
+
+/*
+ * Call for each element in the list that defines flags for a variable
+ */
+static int set_flags(const char *name, const char *value, void *priv)
+{
+	struct env_entry e, *ep;
+
+	e.key	= name;
+	e.data	= NULL;
+	e.callback = NULL;
+	hsearch_r(e, ENV_FIND, &ep, &env_htab, 0);
+
+	/* does the env variable actually exist? */
+	if (ep != NULL) {
+		/* the flag list is empty, so clear the flags */
+		if (value == NULL || strlen(value) == 0)
+			ep->flags = 0;
+		else
+			/* assign the requested flags */
+			ep->flags = env_parse_flags_to_bin(value);
+	}
+
+	return 0;
+}
+
+static int on_flags(const char *name, const char *value, enum env_op op,
+	int flags)
+{
+	/* remove all flags */
+	hwalk_r(&env_htab, clear_flags);
+
+	/* configure any static flags */
+	env_attr_walk(ENV_FLAGS_LIST_STATIC, set_flags, NULL);
+	/* configure any dynamic flags */
+	env_attr_walk(value, set_flags, NULL);
+
+	return 0;
+}
+U_BOOT_ENV_CALLBACK(flags, on_flags);
+
+/*
+ * Perform consistency checking before creating, overwriting, or deleting an
+ * environment variable. Called as a callback function by hsearch_r() and
+ * hdelete_r(). Returns 0 in case of success, 1 in case of failure.
+ * When (flag & H_FORCE) is set, do not print out any error message and force
+ * overwriting of write-once variables.
+ */
+
+int env_flags_validate(const struct env_entry *item, const char *newval,
+		       enum env_op op, int flag)
+{
+	const char *name;
+	const char *oldval = NULL;
+
+	if (op != env_op_create)
+		oldval = item->data;
+
+	name = item->key;
+
+	/* Default value for NULL to protect string-manipulating functions */
+	newval = newval ? : "";
+
+	/* validate the value to match the variable type */
+	if (op != env_op_delete) {
+		enum env_flags_vartype type = (enum env_flags_vartype)
+			(ENV_FLAGS_VARTYPE_BIN_MASK & item->flags);
+
+		if (_env_flags_validate_type(newval, type) < 0) {
+			printf("## Error: flags type check failure for "
+				"\"%s\" <= \"%s\" (type: %c)\n",
+				name, newval, env_flags_vartype_rep[type]);
+			return -1;
+		}
+	}
+
+	/* check for access permission */
+#ifndef CONFIG_ENV_ACCESS_IGNORE_FORCE
+	if (flag & H_FORCE)
+		return 0;
+#endif
+	switch (op) {
+	case env_op_delete:
+		if (item->flags & ENV_FLAGS_VARACCESS_PREVENT_DELETE) {
+			printf("## Error: Can't delete \"%s\"\n", name);
+			return 1;
+		}
+		break;
+	case env_op_overwrite:
+		if (item->flags & ENV_FLAGS_VARACCESS_PREVENT_OVERWR) {
+			printf("## Error: Can't overwrite \"%s\"\n", name);
+			return 1;
+		} else if (item->flags &
+		    ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR) {
+			const char *defval = env_get_default(name);
+
+			if (defval == NULL)
+				defval = "";
+			printf("oldval: %s  defval: %s\n", oldval, defval);
+			if (strcmp(oldval, defval) != 0) {
+				printf("## Error: Can't overwrite \"%s\"\n",
+					name);
+				return 1;
+			}
+		}
+		break;
+	case env_op_create:
+		if (item->flags & ENV_FLAGS_VARACCESS_PREVENT_CREATE) {
+			printf("## Error: Can't create \"%s\"\n", name);
+			return 1;
+		}
+		break;
+	}
+
+	return 0;
+}
+
+#endif

source/bootloader/u-boot-2020.01/env/flash.c

@@ -0,0 +1,368 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2000-2010
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Andreas Heppel <aheppel@sysgo.de>
+ */
+
+/* #define DEBUG */
+
+#include <common.h>
+#include <command.h>
+#include <env.h>
+#include <env_internal.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+#include <search.h>
+#include <errno.h>
+#include <u-boot/crc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifndef CONFIG_SPL_BUILD
+# if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_FLASH)
+#  define CMD_SAVEENV
+# elif defined(CONFIG_ENV_ADDR_REDUND)
+#  error CONFIG_ENV_ADDR_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_FLASH
+# endif
+#endif
+
+/* TODO(sjg@chromium.org): Figure out all these special cases */
+#if (!defined(CONFIG_MICROBLAZE) && !defined(CONFIG_ARCH_ZYNQ) && \
+	!defined(CONFIG_TARGET_MCCMON6) && !defined(CONFIG_TARGET_X600) && \
+	!defined(CONFIG_TARGET_EDMINIV2)) || \
+	!defined(CONFIG_SPL_BUILD)
+#define LOADENV
+#endif
+
+#if !defined(CONFIG_TARGET_X600) || !defined(CONFIG_SPL_BUILD)
+#define INITENV
+#endif
+
+#if defined(CONFIG_ENV_ADDR_REDUND) && defined(CMD_SAVEENV) || \
+	!defined(CONFIG_ENV_ADDR_REDUND) && defined(INITENV)
+#ifdef ENV_IS_EMBEDDED
+static env_t *env_ptr = &embedded_environment;
+#else /* ! ENV_IS_EMBEDDED */
+
+static env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
+#endif /* ENV_IS_EMBEDDED */
+#endif
+static __maybe_unused env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
+
+/* CONFIG_ENV_ADDR is supposed to be on sector boundary */
+static ulong __maybe_unused end_addr =
+		CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1;
+
+#ifdef CONFIG_ENV_ADDR_REDUND
+
+static env_t __maybe_unused *flash_addr_new = (env_t *)CONFIG_ENV_ADDR_REDUND;
+
+/* CONFIG_ENV_ADDR_REDUND is supposed to be on sector boundary */
+static ulong __maybe_unused end_addr_new =
+		CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1;
+#endif /* CONFIG_ENV_ADDR_REDUND */
+
+#ifdef CONFIG_ENV_ADDR_REDUND
+#ifdef INITENV
+static int env_flash_init(void)
+{
+	int crc1_ok = 0, crc2_ok = 0;
+
+	uchar flag1 = flash_addr->flags;
+	uchar flag2 = flash_addr_new->flags;
+
+	ulong addr_default = (ulong)&default_environment[0];
+	ulong addr1 = (ulong)&(flash_addr->data);
+	ulong addr2 = (ulong)&(flash_addr_new->data);
+
+	crc1_ok = crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc;
+	crc2_ok =
+		crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc;
+
+	if (crc1_ok && !crc2_ok) {
+		gd->env_addr	= addr1;
+		gd->env_valid	= ENV_VALID;
+	} else if (!crc1_ok && crc2_ok) {
+		gd->env_addr	= addr2;
+		gd->env_valid	= ENV_VALID;
+	} else if (!crc1_ok && !crc2_ok) {
+		gd->env_addr	= addr_default;
+		gd->env_valid	= ENV_INVALID;
+	} else if (flag1 == ENV_REDUND_ACTIVE &&
+		   flag2 == ENV_REDUND_OBSOLETE) {
+		gd->env_addr	= addr1;
+		gd->env_valid	= ENV_VALID;
+	} else if (flag1 == ENV_REDUND_OBSOLETE &&
+		   flag2 == ENV_REDUND_ACTIVE) {
+		gd->env_addr	= addr2;
+		gd->env_valid	= ENV_VALID;
+	} else if (flag1 == flag2) {
+		gd->env_addr	= addr1;
+		gd->env_valid	= ENV_REDUND;
+	} else if (flag1 == 0xFF) {
+		gd->env_addr	= addr1;
+		gd->env_valid	= ENV_REDUND;
+	} else if (flag2 == 0xFF) {
+		gd->env_addr	= addr2;
+		gd->env_valid	= ENV_REDUND;
+	}
+
+	return 0;
+}
+#endif
+
+#ifdef CMD_SAVEENV
+static int env_flash_save(void)
+{
+	env_t	env_new;
+	char	*saved_data = NULL;
+	char	flag = ENV_REDUND_OBSOLETE, new_flag = ENV_REDUND_ACTIVE;
+	int	rc = 1;
+#if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
+	ulong	up_data = 0;
+#endif
+
+	debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);
+
+	if (flash_sect_protect(0, (ulong)flash_addr, end_addr))
+		goto done;
+
+	debug("Protect off %08lX ... %08lX\n",
+		(ulong)flash_addr_new, end_addr_new);
+
+	if (flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new))
+		goto done;
+
+	rc = env_export(&env_new);
+	if (rc)
+		return rc;
+	env_new.flags	= new_flag;
+
+#if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
+	up_data = end_addr_new + 1 - ((long)flash_addr_new + CONFIG_ENV_SIZE);
+	debug("Data to save 0x%lX\n", up_data);
+	if (up_data) {
+		saved_data = malloc(up_data);
+		if (saved_data == NULL) {
+			printf("Unable to save the rest of sector (%ld)\n",
+				up_data);
+			goto done;
+		}
+		memcpy(saved_data,
+			(void *)((long)flash_addr_new + CONFIG_ENV_SIZE),
+			up_data);
+		debug("Data (start 0x%lX, len 0x%lX) saved at 0x%p\n",
+			(long)flash_addr_new + CONFIG_ENV_SIZE,
+			up_data, saved_data);
+	}
+#endif
+	puts("Erasing Flash...");
+	debug(" %08lX ... %08lX ...", (ulong)flash_addr_new, end_addr_new);
+
+	if (flash_sect_erase((ulong)flash_addr_new, end_addr_new))
+		goto done;
+
+	puts("Writing to Flash... ");
+	debug(" %08lX ... %08lX ...",
+		(ulong)&(flash_addr_new->data),
+		sizeof(env_ptr->data) + (ulong)&(flash_addr_new->data));
+	rc = flash_write((char *)&env_new, (ulong)flash_addr_new,
+			 sizeof(env_new));
+	if (rc)
+		goto perror;
+
+	rc = flash_write(&flag, (ulong)&(flash_addr->flags),
+			 sizeof(flash_addr->flags));
+	if (rc)
+		goto perror;
+
+#if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
+	if (up_data) { /* restore the rest of sector */
+		debug("Restoring the rest of data to 0x%lX len 0x%lX\n",
+			(long)flash_addr_new + CONFIG_ENV_SIZE, up_data);
+		if (flash_write(saved_data,
+				(long)flash_addr_new + CONFIG_ENV_SIZE,
+				up_data))
+			goto perror;
+	}
+#endif
+	puts("done\n");
+
+	{
+		env_t *etmp = flash_addr;
+		ulong ltmp = end_addr;
+
+		flash_addr = flash_addr_new;
+		flash_addr_new = etmp;
+
+		end_addr = end_addr_new;
+		end_addr_new = ltmp;
+	}
+
+	rc = 0;
+	goto done;
+perror:
+	flash_perror(rc);
+done:
+	if (saved_data)
+		free(saved_data);
+	/* try to re-protect */
+	flash_sect_protect(1, (ulong)flash_addr, end_addr);
+	flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
+
+	return rc;
+}
+#endif /* CMD_SAVEENV */
+
+#else /* ! CONFIG_ENV_ADDR_REDUND */
+
+#ifdef INITENV
+static int env_flash_init(void)
+{
+	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
+		gd->env_addr	= (ulong)&(env_ptr->data);
+		gd->env_valid	= ENV_VALID;
+		return 0;
+	}
+
+	gd->env_addr	= (ulong)&default_environment[0];
+	gd->env_valid	= ENV_INVALID;
+	return 0;
+}
+#endif
+
+#ifdef CMD_SAVEENV
+static int env_flash_save(void)
+{
+	env_t	env_new;
+	int	rc = 1;
+	char	*saved_data = NULL;
+#if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
+	ulong	up_data = 0;
+
+	up_data = end_addr + 1 - ((long)flash_addr + CONFIG_ENV_SIZE);
+	debug("Data to save 0x%lx\n", up_data);
+	if (up_data) {
+		saved_data = malloc(up_data);
+		if (saved_data == NULL) {
+			printf("Unable to save the rest of sector (%ld)\n",
+				up_data);
+			goto done;
+		}
+		memcpy(saved_data,
+			(void *)((long)flash_addr + CONFIG_ENV_SIZE), up_data);
+		debug("Data (start 0x%lx, len 0x%lx) saved at 0x%lx\n",
+			(ulong)flash_addr + CONFIG_ENV_SIZE,
+			up_data,
+			(ulong)saved_data);
+	}
+#endif	/* CONFIG_ENV_SECT_SIZE */
+
+	debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);
+
+	if (flash_sect_protect(0, (long)flash_addr, end_addr))
+		goto done;
+
+	rc = env_export(&env_new);
+	if (rc)
+		goto done;
+
+	puts("Erasing Flash...");
+	if (flash_sect_erase((long)flash_addr, end_addr))
+		goto done;
+
+	puts("Writing to Flash... ");
+	rc = flash_write((char *)&env_new, (long)flash_addr, CONFIG_ENV_SIZE);
+	if (rc != 0)
+		goto perror;
+
+#if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
+	if (up_data) {	/* restore the rest of sector */
+		debug("Restoring the rest of data to 0x%lx len 0x%lx\n",
+			(ulong)flash_addr + CONFIG_ENV_SIZE, up_data);
+		if (flash_write(saved_data,
+				(long)flash_addr + CONFIG_ENV_SIZE,
+				up_data))
+			goto perror;
+	}
+#endif
+	puts("done\n");
+	rc = 0;
+	goto done;
+perror:
+	flash_perror(rc);
+done:
+	if (saved_data)
+		free(saved_data);
+	/* try to re-protect */
+	flash_sect_protect(1, (long)flash_addr, end_addr);
+	return rc;
+}
+#endif /* CMD_SAVEENV */
+
+#endif /* CONFIG_ENV_ADDR_REDUND */
+
+#ifdef LOADENV
+static int env_flash_load(void)
+{
+#ifdef CONFIG_ENV_ADDR_REDUND
+	if (gd->env_addr != (ulong)&(flash_addr->data)) {
+		env_t *etmp = flash_addr;
+		ulong ltmp = end_addr;
+
+		flash_addr = flash_addr_new;
+		flash_addr_new = etmp;
+
+		end_addr = end_addr_new;
+		end_addr_new = ltmp;
+	}
+
+	if (flash_addr_new->flags != ENV_REDUND_OBSOLETE &&
+	    crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc) {
+		char flag = ENV_REDUND_OBSOLETE;
+
+		gd->env_valid = ENV_REDUND;
+		flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new);
+		flash_write(&flag,
+			    (ulong)&(flash_addr_new->flags),
+			    sizeof(flash_addr_new->flags));
+		flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
+	}
+
+	if (flash_addr->flags != ENV_REDUND_ACTIVE &&
+	    (flash_addr->flags & ENV_REDUND_ACTIVE) == ENV_REDUND_ACTIVE) {
+		char flag = ENV_REDUND_ACTIVE;
+
+		gd->env_valid = ENV_REDUND;
+		flash_sect_protect(0, (ulong)flash_addr, end_addr);
+		flash_write(&flag,
+			    (ulong)&(flash_addr->flags),
+			    sizeof(flash_addr->flags));
+		flash_sect_protect(1, (ulong)flash_addr, end_addr);
+	}
+
+	if (gd->env_valid == ENV_REDUND)
+		puts("*** Warning - some problems detected "
+		     "reading environment; recovered successfully\n\n");
+#endif /* CONFIG_ENV_ADDR_REDUND */
+
+	return env_import((char *)flash_addr, 1);
+}
+#endif /* LOADENV */
+
+U_BOOT_ENV_LOCATION(flash) = {
+	.location	= ENVL_FLASH,
+	ENV_NAME("Flash")
+#ifdef LOADENV
+	.load		= env_flash_load,
+#endif
+#ifdef CMD_SAVEENV
+	.save		= env_save_ptr(env_flash_save),
+#endif
+#ifdef INITENV
+	.init		= env_flash_init,
+#endif
+};

source/bootloader/u-boot-2020.01/env/mmc.c

@@ -0,0 +1,398 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2008-2011 Freescale Semiconductor, Inc.
+ */
+
+/* #define DEBUG */
+
+#include <common.h>
+
+#include <command.h>
+#include <env.h>
+#include <env_internal.h>
+#include <fdtdec.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+#include <memalign.h>
+#include <mmc.h>
+#include <part.h>
+#include <search.h>
+#include <errno.h>
+
+#define __STR(X) #X
+#define STR(X) __STR(X)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+static inline int mmc_offset_try_partition(const char *str, s64 *val)
+{
+	disk_partition_t info;
+	struct blk_desc *desc;
+	int len, i, ret;
+
+	ret = blk_get_device_by_str("mmc", STR(CONFIG_SYS_MMC_ENV_DEV), &desc);
+	if (ret < 0)
+		return (ret);
+
+	for (i = 1;;i++) {
+		ret = part_get_info(desc, i, &info);
+		if (ret < 0)
+			return ret;
+
+		if (!strncmp((const char *)info.name, str, sizeof(str)))
+			break;
+	}
+
+	/* round up to info.blksz */
+	len = (CONFIG_ENV_SIZE + info.blksz - 1) & ~(info.blksz - 1);
+
+	/* use the top of the partion for the environment */
+	*val = (info.start + info.size - 1) - len / info.blksz;
+
+	return 0;
+}
+
+static inline s64 mmc_offset(int copy)
+{
+	const struct {
+		const char *offset_redund;
+		const char *partition;
+		const char *offset;
+	} dt_prop = {
+		.offset_redund = "u-boot,mmc-env-offset-redundant",
+		.partition = "u-boot,mmc-env-partition",
+		.offset = "u-boot,mmc-env-offset",
+	};
+	s64 val = 0, defvalue;
+	const char *propname;
+	const char *str;
+	int err;
+
+	/* look for the partition in mmc CONFIG_SYS_MMC_ENV_DEV */
+	str = fdtdec_get_config_string(gd->fdt_blob, dt_prop.partition);
+	if (str) {
+		/* try to place the environment at end of the partition */
+		err = mmc_offset_try_partition(str, &val);
+		if (!err)
+			return val;
+	}
+
+	defvalue = CONFIG_ENV_OFFSET;
+	propname = dt_prop.offset;
+
+#if defined(CONFIG_ENV_OFFSET_REDUND)
+	if (copy) {
+		defvalue = CONFIG_ENV_OFFSET_REDUND;
+		propname = dt_prop.offset_redund;
+	}
+#endif
+	return fdtdec_get_config_int(gd->fdt_blob, propname, defvalue);
+}
+#else
+static inline s64 mmc_offset(int copy)
+{
+	s64 offset = CONFIG_ENV_OFFSET;
+
+#if defined(CONFIG_ENV_OFFSET_REDUND)
+	if (copy)
+		offset = CONFIG_ENV_OFFSET_REDUND;
+#endif
+	return offset;
+}
+#endif
+
+__weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
+{
+	s64 offset = mmc_offset(copy);
+
+	if (offset < 0)
+		offset += mmc->capacity;
+
+	*env_addr = offset;
+
+	return 0;
+}
+
+__weak int mmc_get_env_dev(void)
+{
+	return CONFIG_SYS_MMC_ENV_DEV;
+}
+
+#ifdef CONFIG_SYS_MMC_ENV_PART
+__weak uint mmc_get_env_part(struct mmc *mmc)
+{
+	return CONFIG_SYS_MMC_ENV_PART;
+}
+
+static unsigned char env_mmc_orig_hwpart;
+
+static int mmc_set_env_part(struct mmc *mmc)
+{
+	uint part = mmc_get_env_part(mmc);
+	int dev = mmc_get_env_dev();
+	int ret = 0;
+
+	env_mmc_orig_hwpart = mmc_get_blk_desc(mmc)->hwpart;
+	ret = blk_select_hwpart_devnum(IF_TYPE_MMC, dev, part);
+	if (ret)
+		puts("MMC partition switch failed\n");
+
+	return ret;
+}
+#else
+static inline int mmc_set_env_part(struct mmc *mmc) {return 0; };
+#endif
+
+static const char *init_mmc_for_env(struct mmc *mmc)
+{
+	if (!mmc)
+		return "No MMC card found";
+
+#if CONFIG_IS_ENABLED(BLK)
+	struct udevice *dev;
+
+	if (blk_get_from_parent(mmc->dev, &dev))
+		return "No block device";
+#else
+	if (mmc_init(mmc))
+		return "MMC init failed";
+#endif
+	if (mmc_set_env_part(mmc))
+		return "MMC partition switch failed";
+
+	return NULL;
+}
+
+static void fini_mmc_for_env(struct mmc *mmc)
+{
+#ifdef CONFIG_SYS_MMC_ENV_PART
+	int dev = mmc_get_env_dev();
+
+	blk_select_hwpart_devnum(IF_TYPE_MMC, dev, env_mmc_orig_hwpart);
+#endif
+}
+
+#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_SPL_BUILD)
+static inline int write_env(struct mmc *mmc, unsigned long size,
+			    unsigned long offset, const void *buffer)
+{
+	uint blk_start, blk_cnt, n;
+	struct blk_desc *desc = mmc_get_blk_desc(mmc);
+
+	blk_start	= ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
+	blk_cnt		= ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
+
+	n = blk_dwrite(desc, blk_start, blk_cnt, (u_char *)buffer);
+
+	return (n == blk_cnt) ? 0 : -1;
+}
+
+static int env_mmc_save(void)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
+	int dev = mmc_get_env_dev();
+	struct mmc *mmc = find_mmc_device(dev);
+	u32	offset;
+	int	ret, copy = 0;
+	const char *errmsg;
+
+	errmsg = init_mmc_for_env(mmc);
+	if (errmsg) {
+		printf("%s\n", errmsg);
+		return 1;
+	}
+
+	ret = env_export(env_new);
+	if (ret)
+		goto fini;
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	if (gd->env_valid == ENV_VALID)
+		copy = 1;
+#endif
+
+	if (mmc_get_env_addr(mmc, copy, &offset)) {
+		ret = 1;
+		goto fini;
+	}
+
+	printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "", dev);
+	if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
+		puts("failed\n");
+		ret = 1;
+		goto fini;
+	}
+
+	ret = 0;
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID : ENV_REDUND;
+#endif
+
+fini:
+	fini_mmc_for_env(mmc);
+	return ret;
+}
+
+#if defined(CONFIG_CMD_ERASEENV)
+static inline int erase_env(struct mmc *mmc, unsigned long size,
+			    unsigned long offset)
+{
+	uint blk_start, blk_cnt, n;
+	struct blk_desc *desc = mmc_get_blk_desc(mmc);
+
+	blk_start	= ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
+	blk_cnt		= ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
+
+	n = blk_derase(desc, blk_start, blk_cnt);
+	printf("%d blocks erased: %s\n", n, (n == blk_cnt) ? "OK" : "ERROR");
+
+	return (n == blk_cnt) ? 0 : 1;
+}
+
+static int env_mmc_erase(void)
+{
+	int dev = mmc_get_env_dev();
+	struct mmc *mmc = find_mmc_device(dev);
+	int	ret, copy = 0;
+	u32	offset;
+	const char *errmsg;
+
+	errmsg = init_mmc_for_env(mmc);
+	if (errmsg) {
+		printf("%s\n", errmsg);
+		return 1;
+	}
+
+	if (mmc_get_env_addr(mmc, copy, &offset))
+		return CMD_RET_FAILURE;
+
+	ret = erase_env(mmc, CONFIG_ENV_SIZE, offset);
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	copy = 1;
+
+	if (mmc_get_env_addr(mmc, copy, &offset))
+		return CMD_RET_FAILURE;
+
+	ret |= erase_env(mmc, CONFIG_ENV_SIZE, offset);
+#endif
+
+	return ret;
+}
+#endif /* CONFIG_CMD_ERASEENV */
+#endif /* CONFIG_CMD_SAVEENV && !CONFIG_SPL_BUILD */
+
+static inline int read_env(struct mmc *mmc, unsigned long size,
+			   unsigned long offset, const void *buffer)
+{
+	uint blk_start, blk_cnt, n;
+	struct blk_desc *desc = mmc_get_blk_desc(mmc);
+
+	blk_start	= ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
+	blk_cnt		= ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
+
+	n = blk_dread(desc, blk_start, blk_cnt, (uchar *)buffer);
+
+	return (n == blk_cnt) ? 0 : -1;
+}
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+static int env_mmc_load(void)
+{
+#if !defined(ENV_IS_EMBEDDED)
+	struct mmc *mmc;
+	u32 offset1, offset2;
+	int read1_fail = 0, read2_fail = 0;
+	int ret;
+	int dev = mmc_get_env_dev();
+	const char *errmsg = NULL;
+
+	ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
+	ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
+
+	mmc_initialize(NULL);
+
+	mmc = find_mmc_device(dev);
+
+	errmsg = init_mmc_for_env(mmc);
+	if (errmsg) {
+		ret = -EIO;
+		goto err;
+	}
+
+	if (mmc_get_env_addr(mmc, 0, &offset1) ||
+	    mmc_get_env_addr(mmc, 1, &offset2)) {
+		ret = -EIO;
+		goto fini;
+	}
+
+	read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
+	read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
+
+	ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
+				read2_fail);
+
+fini:
+	fini_mmc_for_env(mmc);
+err:
+	if (ret)
+		env_set_default(errmsg, 0);
+
+#endif
+	return ret;
+}
+#else /* ! CONFIG_ENV_OFFSET_REDUND */
+static int env_mmc_load(void)
+{
+#if !defined(ENV_IS_EMBEDDED)
+	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
+	struct mmc *mmc;
+	u32 offset;
+	int ret;
+	int dev = mmc_get_env_dev();
+	const char *errmsg;
+
+	mmc = find_mmc_device(dev);
+
+	errmsg = init_mmc_for_env(mmc);
+	if (errmsg) {
+		ret = -EIO;
+		goto err;
+	}
+
+	if (mmc_get_env_addr(mmc, 0, &offset)) {
+		ret = -EIO;
+		goto fini;
+	}
+
+	if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
+		errmsg = "!read failed";
+		ret = -EIO;
+		goto fini;
+	}
+
+	ret = env_import(buf, 1);
+
+fini:
+	fini_mmc_for_env(mmc);
+err:
+	if (ret)
+		env_set_default(errmsg, 0);
+#endif
+	return ret;
+}
+#endif /* CONFIG_ENV_OFFSET_REDUND */
+
+U_BOOT_ENV_LOCATION(mmc) = {
+	.location	= ENVL_MMC,
+	ENV_NAME("MMC")
+	.load		= env_mmc_load,
+#ifndef CONFIG_SPL_BUILD
+	.save		= env_save_ptr(env_mmc_save),
+#if defined(CONFIG_CMD_ERASEENV)
+	.erase		= env_mmc_erase,
+#endif
+#endif
+};

source/bootloader/u-boot-2020.01/env/nand.c

@@ -0,0 +1,390 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2000-2010
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2008
+ * Stuart Wood, Lab X Technologies <stuart.wood@labxtechnologies.com>
+ *
+ * (C) Copyright 2004
+ * Jian Zhang, Texas Instruments, jzhang@ti.com.
+ *
+ * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Andreas Heppel <aheppel@sysgo.de>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <env.h>
+#include <env_internal.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+#include <memalign.h>
+#include <nand.h>
+#include <search.h>
+#include <errno.h>
+#include <u-boot/crc.h>
+
+#if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND) && \
+		!defined(CONFIG_SPL_BUILD)
+#define CMD_SAVEENV
+#elif defined(CONFIG_ENV_OFFSET_REDUND) && !defined(CONFIG_SPL_BUILD)
+#error CONFIG_ENV_OFFSET_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_NAND
+#endif
+
+#ifndef CONFIG_ENV_RANGE
+#define CONFIG_ENV_RANGE	CONFIG_ENV_SIZE
+#endif
+
+#if defined(ENV_IS_EMBEDDED)
+static env_t *env_ptr = &environment;
+#elif defined(CONFIG_NAND_ENV_DST)
+static env_t *env_ptr = (env_t *)CONFIG_NAND_ENV_DST;
+#endif /* ENV_IS_EMBEDDED */
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * This is called before nand_init() so we can't read NAND to
+ * validate env data.
+ *
+ * Mark it OK for now. env_relocate() in env_common.c will call our
+ * relocate function which does the real validation.
+ *
+ * When using a NAND boot image (like sequoia_nand), the environment
+ * can be embedded or attached to the U-Boot image in NAND flash.
+ * This way the SPL loads not only the U-Boot image from NAND but
+ * also the environment.
+ */
+static int env_nand_init(void)
+{
+#if defined(ENV_IS_EMBEDDED) || defined(CONFIG_NAND_ENV_DST)
+	int crc1_ok = 0, crc2_ok = 0;
+	env_t *tmp_env1;
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	env_t *tmp_env2;
+
+	tmp_env2 = (env_t *)((ulong)env_ptr + CONFIG_ENV_SIZE);
+	crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc;
+#endif
+	tmp_env1 = env_ptr;
+	crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc;
+
+	if (!crc1_ok && !crc2_ok) {
+		gd->env_addr	= 0;
+		gd->env_valid	= ENV_INVALID;
+
+		return 0;
+	} else if (crc1_ok && !crc2_ok) {
+		gd->env_valid = ENV_VALID;
+	}
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	else if (!crc1_ok && crc2_ok) {
+		gd->env_valid = ENV_REDUND;
+	} else {
+		/* both ok - check serial */
+		if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
+			gd->env_valid = ENV_REDUND;
+		else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
+			gd->env_valid = ENV_VALID;
+		else if (tmp_env1->flags > tmp_env2->flags)
+			gd->env_valid = ENV_VALID;
+		else if (tmp_env2->flags > tmp_env1->flags)
+			gd->env_valid = ENV_REDUND;
+		else /* flags are equal - almost impossible */
+			gd->env_valid = ENV_VALID;
+	}
+
+	if (gd->env_valid == ENV_REDUND)
+		env_ptr = tmp_env2;
+	else
+#endif
+	if (gd->env_valid == ENV_VALID)
+		env_ptr = tmp_env1;
+
+	gd->env_addr = (ulong)env_ptr->data;
+
+#else /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
+	gd->env_addr	= (ulong)&default_environment[0];
+	gd->env_valid	= ENV_VALID;
+#endif /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
+
+	return 0;
+}
+
+#ifdef CMD_SAVEENV
+/*
+ * The legacy NAND code saved the environment in the first NAND device i.e.,
+ * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
+ */
+static int writeenv(size_t offset, u_char *buf)
+{
+	size_t end = offset + CONFIG_ENV_RANGE;
+	size_t amount_saved = 0;
+	size_t blocksize, len;
+	struct mtd_info *mtd;
+	u_char *char_ptr;
+
+	mtd = get_nand_dev_by_index(0);
+	if (!mtd)
+		return 1;
+
+	blocksize = mtd->erasesize;
+	len = min(blocksize, (size_t)CONFIG_ENV_SIZE);
+
+	while (amount_saved < CONFIG_ENV_SIZE && offset < end) {
+		if (nand_block_isbad(mtd, offset)) {
+			offset += blocksize;
+		} else {
+			char_ptr = &buf[amount_saved];
+			if (nand_write(mtd, offset, &len, char_ptr))
+				return 1;
+
+			offset += blocksize;
+			amount_saved += len;
+		}
+	}
+	if (amount_saved != CONFIG_ENV_SIZE)
+		return 1;
+
+	return 0;
+}
+
+struct nand_env_location {
+	const char *name;
+	const nand_erase_options_t erase_opts;
+};
+
+static int erase_and_write_env(const struct nand_env_location *location,
+		u_char *env_new)
+{
+	struct mtd_info *mtd;
+	int ret = 0;
+
+	mtd = get_nand_dev_by_index(0);
+	if (!mtd)
+		return 1;
+
+	printf("Erasing %s...\n", location->name);
+	if (nand_erase_opts(mtd, &location->erase_opts))
+		return 1;
+
+	printf("Writing to %s... ", location->name);
+	ret = writeenv(location->erase_opts.offset, env_new);
+	puts(ret ? "FAILED!\n" : "OK\n");
+
+	return ret;
+}
+
+static int env_nand_save(void)
+{
+	int	ret = 0;
+	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
+	int	env_idx = 0;
+	static const struct nand_env_location location[] = {
+		{
+			.name = "NAND",
+			.erase_opts = {
+				.length = CONFIG_ENV_RANGE,
+				.offset = CONFIG_ENV_OFFSET,
+			},
+		},
+#ifdef CONFIG_ENV_OFFSET_REDUND
+		{
+			.name = "redundant NAND",
+			.erase_opts = {
+				.length = CONFIG_ENV_RANGE,
+				.offset = CONFIG_ENV_OFFSET_REDUND,
+			},
+		},
+#endif
+	};
+
+
+	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
+		return 1;
+
+	ret = env_export(env_new);
+	if (ret)
+		return ret;
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	env_idx = (gd->env_valid == ENV_VALID);
+#endif
+
+	ret = erase_and_write_env(&location[env_idx], (u_char *)env_new);
+#ifdef CONFIG_ENV_OFFSET_REDUND
+	if (!ret) {
+		/* preset other copy for next write */
+		gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID :
+				ENV_REDUND;
+		return ret;
+	}
+
+	env_idx = (env_idx + 1) & 1;
+	ret = erase_and_write_env(&location[env_idx], (u_char *)env_new);
+	if (!ret)
+		printf("Warning: primary env write failed,"
+				" redundancy is lost!\n");
+#endif
+
+	return ret;
+}
+#endif /* CMD_SAVEENV */
+
+#if defined(CONFIG_SPL_BUILD)
+static int readenv(size_t offset, u_char *buf)
+{
+	return nand_spl_load_image(offset, CONFIG_ENV_SIZE, buf);
+}
+#else
+static int readenv(size_t offset, u_char *buf)
+{
+	size_t end = offset + CONFIG_ENV_RANGE;
+	size_t amount_loaded = 0;
+	size_t blocksize, len;
+	struct mtd_info *mtd;
+	u_char *char_ptr;
+
+	mtd = get_nand_dev_by_index(0);
+	if (!mtd)
+		return 1;
+
+	blocksize = mtd->erasesize;
+	len = min(blocksize, (size_t)CONFIG_ENV_SIZE);
+
+	while (amount_loaded < CONFIG_ENV_SIZE && offset < end) {
+		if (nand_block_isbad(mtd, offset)) {
+			offset += blocksize;
+		} else {
+			char_ptr = &buf[amount_loaded];
+			if (nand_read_skip_bad(mtd, offset,
+					       &len, NULL,
+					       mtd->size, char_ptr))
+				return 1;
+
+			offset += blocksize;
+			amount_loaded += len;
+		}
+	}
+
+	if (amount_loaded != CONFIG_ENV_SIZE)
+		return 1;
+
+	return 0;
+}
+#endif /* #if defined(CONFIG_SPL_BUILD) */
+
+#ifdef CONFIG_ENV_OFFSET_OOB
+int get_nand_env_oob(struct mtd_info *mtd, unsigned long *result)
+{
+	struct mtd_oob_ops ops;
+	uint32_t oob_buf[ENV_OFFSET_SIZE / sizeof(uint32_t)];
+	int ret;
+
+	ops.datbuf	= NULL;
+	ops.mode	= MTD_OOB_AUTO;
+	ops.ooboffs	= 0;
+	ops.ooblen	= ENV_OFFSET_SIZE;
+	ops.oobbuf	= (void *)oob_buf;
+
+	ret = mtd->read_oob(mtd, ENV_OFFSET_SIZE, &ops);
+	if (ret) {
+		printf("error reading OOB block 0\n");
+		return ret;
+	}
+
+	if (oob_buf[0] == ENV_OOB_MARKER) {
+		*result = ovoid ob_buf[1] * mtd->erasesize;
+	} else if (oob_buf[0] == ENV_OOB_MARKER_OLD) {
+		*result = oob_buf[1];
+	} else {
+		printf("No dynamic environment marker in OOB block 0\n");
+		return -ENOENT;
+	}
+
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+static int env_nand_load(void)
+{
+#if defined(ENV_IS_EMBEDDED)
+	return 0;
+#else
+	int read1_fail, read2_fail;
+	env_t *tmp_env1, *tmp_env2;
+	int ret = 0;
+
+	tmp_env1 = (env_t *)malloc(CONFIG_ENV_SIZE);
+	tmp_env2 = (env_t *)malloc(CONFIG_ENV_SIZE);
+	if (tmp_env1 == NULL || tmp_env2 == NULL) {
+		puts("Can't allocate buffers for environment\n");
+		env_set_default("malloc() failed", 0);
+		ret = -EIO;
+		goto done;
+	}
+
+	read1_fail = readenv(CONFIG_ENV_OFFSET, (u_char *) tmp_env1);
+	read2_fail = readenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) tmp_env2);
+
+	ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
+				read2_fail);
+
+done:
+	free(tmp_env1);
+	free(tmp_env2);
+
+	return ret;
+#endif /* ! ENV_IS_EMBEDDED */
+}
+#else /* ! CONFIG_ENV_OFFSET_REDUND */
+/*
+ * The legacy NAND code saved the environment in the first NAND
+ * device i.e., nand_dev_desc + 0. This is also the behaviour using
+ * the new NAND code.
+ */
+static int env_nand_load(void)
+{
+#if !defined(ENV_IS_EMBEDDED)
+	int ret;
+	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
+
+#if defined(CONFIG_ENV_OFFSET_OOB)
+	struct mtd_info *mtd  = get_nand_dev_by_index(0);
+	/*
+	 * If unable to read environment offset from NAND OOB then fall through
+	 * to the normal environment reading code below
+	 */
+	if (mtd && !get_nand_env_oob(mtd, &nand_env_oob_offset)) {
+		printf("Found Environment offset in OOB..\n");
+	} else {
+		env_set_default("no env offset in OOB", 0);
+		return;
+	}
+#endif
+
+	ret = readenv(CONFIG_ENV_OFFSET, (u_char *)buf);
+	if (ret) {
+		env_set_default("readenv() failed", 0);
+		return -EIO;
+	}
+
+	return env_import(buf, 1);
+#endif /* ! ENV_IS_EMBEDDED */
+
+	return 0;
+}
+#endif /* CONFIG_ENV_OFFSET_REDUND */
+
+U_BOOT_ENV_LOCATION(nand) = {
+	.location	= ENVL_NAND,
+	ENV_NAME("NAND")
+	.load		= env_nand_load,
+#if defined(CMD_SAVEENV)
+	.save		= env_save_ptr(env_nand_save),
+#endif
+	.init		= env_nand_init,
+};

source/bootloader/u-boot-2020.01/env/nowhere.c

@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2000-2010
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Andreas Heppel <aheppel@sysgo.de>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <env.h>
+#include <env_internal.h>
+#include <linux/stddef.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Because we only ever have the default environment available we must mark
+ * it as invalid.
+ */
+static int env_nowhere_init(void)
+{
+	gd->env_addr	= (ulong)&default_environment[0];
+	gd->env_valid	= ENV_INVALID;
+
+	return 0;
+}
+
+U_BOOT_ENV_LOCATION(nowhere) = {
+	.location	= ENVL_NOWHERE,
+	.init		= env_nowhere_init,
+	ENV_NAME("nowhere")
+};

source/bootloader/u-boot-2020.01/env/nvram.c

@@ -0,0 +1,123 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2000-2010
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Andreas Heppel <aheppel@sysgo.de>
+ */
+
+/*
+ * 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
+ *
+ * It might not be possible in all cases to use 'memcpy()' to copy
+ * the environment to NVRAM, as the NVRAM might not be mapped into
+ * the memory space. (I.e. this is the case for the BAB750). In those
+ * cases it might be possible to access the NVRAM using a different
+ * method. For example, the RTC on the BAB750 is accessible in IO
+ * space using its address and data registers. To enable usage of
+ * NVRAM in those cases I invented the functions 'nvram_read()' and
+ * 'nvram_write()', which will be activated upon the configuration
+ * #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are
+ * strongly dependent on the used HW, and must be redefined for each
+ * board that wants to use them.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <env.h>
+#include <env_internal.h>
+#include <linux/stddef.h>
+#include <search.h>
+#include <errno.h>
+#include <u-boot/crc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
+extern void *nvram_read(void *dest, const long src, size_t count);
+extern void nvram_write(long dest, const void *src, size_t count);
+#else
+env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
+#endif
+
+#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
+/** Call this function from overridden env_get_char_spec() if you need
+ * this functionality.
+ */
+int env_nvram_get_char(int index)
+{
+	uchar c;
+
+	nvram_read(&c, CONFIG_ENV_ADDR + index, 1);
+
+	return c;
+}
+#endif
+
+static int env_nvram_load(void)
+{
+	char buf[CONFIG_ENV_SIZE];
+
+#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
+	nvram_read(buf, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
+#else
+	memcpy(buf, (void *)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
+#endif
+	return env_import(buf, 1);
+}
+
+static int env_nvram_save(void)
+{
+	env_t	env_new;
+	int	rcode = 0;
+
+	rcode = env_export(&env_new);
+	if (rcode)
+		return rcode;
+
+#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
+	nvram_write(CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE);
+#else
+	if (memcpy((char *)CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE) == NULL)
+		rcode = 1;
+#endif
+	return rcode;
+}
+
+/*
+ * Initialize Environment use
+ *
+ * We are still running from ROM, so data use is limited
+ */
+static int env_nvram_init(void)
+{
+#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
+	ulong crc;
+	uchar data[ENV_SIZE];
+
+	nvram_read(&crc, CONFIG_ENV_ADDR, sizeof(ulong));
+	nvram_read(data, CONFIG_ENV_ADDR + sizeof(ulong), ENV_SIZE);
+
+	if (crc32(0, data, ENV_SIZE) == crc) {
+		gd->env_addr	= (ulong)CONFIG_ENV_ADDR + sizeof(long);
+#else
+	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
+		gd->env_addr	= (ulong)&env_ptr->data;
+#endif
+		gd->env_valid = ENV_VALID;
+	} else {
+		gd->env_addr	= (ulong)&default_environment[0];
+		gd->env_valid	= ENV_INVALID;
+	}
+
+	return 0;
+}
+
+U_BOOT_ENV_LOCATION(nvram) = {
+	.location	= ENVL_NVRAM,
+	ENV_NAME("NVRAM")
+	.load		= env_nvram_load,
+	.save		= env_save_ptr(env_nvram_save),
+	.init		= env_nvram_init,
+};

source/bootloader/u-boot-2020.01/env/onenand.c

@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2010 DENX Software Engineering
+ * Wolfgang Denk <wd@denx.de>
+ *
+ * (C) Copyright 2005-2009 Samsung Electronics
+ * Kyungmin Park <kyungmin.park@samsung.com>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <env_internal.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+#include <search.h>
+#include <errno.h>
+#include <onenand_uboot.h>
+
+#include <linux/compat.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/onenand.h>
+
+#define ONENAND_MAX_ENV_SIZE	CONFIG_ENV_SIZE
+#define ONENAND_ENV_SIZE(mtd)	(ONENAND_MAX_ENV_SIZE - ENV_HEADER_SIZE)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int env_onenand_load(void)
+{
+	struct mtd_info *mtd = &onenand_mtd;
+#ifdef CONFIG_ENV_ADDR_FLEX
+	struct onenand_chip *this = &onenand_chip;
+#endif
+	int rc;
+	size_t retlen;
+#ifdef ENV_IS_EMBEDDED
+	char *buf = (char *)&environment;
+#else
+	loff_t env_addr = CONFIG_ENV_ADDR;
+	char onenand_env[ONENAND_MAX_ENV_SIZE];
+	char *buf = (char *)&onenand_env[0];
+#endif /* ENV_IS_EMBEDDED */
+
+#ifndef ENV_IS_EMBEDDED
+# ifdef CONFIG_ENV_ADDR_FLEX
+	if (FLEXONENAND(this))
+		env_addr = CONFIG_ENV_ADDR_FLEX;
+# endif
+	/* Check OneNAND exist */
+	if (mtd->writesize)
+		/* Ignore read fail */
+		mtd_read(mtd, env_addr, ONENAND_MAX_ENV_SIZE,
+				&retlen, (u_char *)buf);
+	else
+		mtd->writesize = MAX_ONENAND_PAGESIZE;
+#endif /* !ENV_IS_EMBEDDED */
+
+	rc = env_import(buf, 1);
+	if (!rc)
+		gd->env_valid = ENV_VALID;
+
+	return rc;
+}
+
+static int env_onenand_save(void)
+{
+	env_t	env_new;
+	int ret;
+	struct mtd_info *mtd = &onenand_mtd;
+#ifdef CONFIG_ENV_ADDR_FLEX
+	struct onenand_chip *this = &onenand_chip;
+#endif
+	loff_t	env_addr = CONFIG_ENV_ADDR;
+	size_t	retlen;
+	struct erase_info instr = {
+		.callback	= NULL,
+	};
+
+	ret = env_export(&env_new);
+	if (ret)
+		return ret;
+
+	instr.len = CONFIG_ENV_SIZE;
+#ifdef CONFIG_ENV_ADDR_FLEX
+	if (FLEXONENAND(this)) {
+		env_addr = CONFIG_ENV_ADDR_FLEX;
+		instr.len = CONFIG_ENV_SIZE_FLEX;
+		instr.len <<= onenand_mtd.eraseregions[0].numblocks == 1 ?
+				1 : 0;
+	}
+#endif
+	instr.addr = env_addr;
+	instr.mtd = mtd;
+	if (mtd_erase(mtd, &instr)) {
+		printf("OneNAND: erase failed at 0x%08llx\n", env_addr);
+		return 1;
+	}
+
+	if (mtd_write(mtd, env_addr, ONENAND_MAX_ENV_SIZE, &retlen,
+			(u_char *)&env_new)) {
+		printf("OneNAND: write failed at 0x%llx\n", instr.addr);
+		return 2;
+	}
+
+	return 0;
+}
+
+U_BOOT_ENV_LOCATION(onenand) = {
+	.location	= ENVL_ONENAND,
+	ENV_NAME("OneNAND")
+	.load		= env_onenand_load,
+	.save		= env_save_ptr(env_onenand_save),
+};

source/bootloader/u-boot-2020.01/env/remote.c

@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2011-2012 Freescale Semiconductor, Inc.
+ */
+
+/* #define DEBUG */
+
+#include <common.h>
+#include <command.h>
+#include <env_internal.h>
+#include <linux/stddef.h>
+#include <u-boot/crc.h>
+
+#ifdef ENV_IS_EMBEDDED
+env_t *env_ptr = &environment;
+#else /* ! ENV_IS_EMBEDDED */
+env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
+#endif /* ENV_IS_EMBEDDED */
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int env_remote_init(void)
+{
+	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
+		gd->env_addr = (ulong)&(env_ptr->data);
+		gd->env_valid = ENV_VALID;
+		return 0;
+	}
+
+	return -ENOENT;
+}
+
+#ifdef CONFIG_CMD_SAVEENV
+static int env_remote_save(void)
+{
+#ifdef CONFIG_SRIO_PCIE_BOOT_SLAVE
+	printf("Can not support the 'saveenv' when boot from SRIO or PCIE!\n");
+	return 1;
+#else
+	return 0;
+#endif
+}
+#endif /* CONFIG_CMD_SAVEENV */
+
+static int env_remote_load(void)
+{
+#ifndef ENV_IS_EMBEDDED
+	return env_import((char *)env_ptr, 1);
+#endif
+
+	return 0;
+}
+
+U_BOOT_ENV_LOCATION(remote) = {
+	.location	= ENVL_REMOTE,
+	ENV_NAME("Remote")
+	.load		= env_remote_load,
+	.save		= env_save_ptr(env_remote_save),
+	.init		= env_remote_init,
+};

source/bootloader/u-boot-2020.01/env/sata.c

@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2010-2016 Freescale Semiconductor, Inc.
+ */
+
+/* #define DEBUG */
+
+#include <common.h>
+
+#include <command.h>
+#include <env.h>
+#include <env_internal.h>
+#include <linux/stddef.h>
+#include <errno.h>
+#include <memalign.h>
+#include <sata.h>
+#include <search.h>
+
+#if defined(CONFIG_ENV_OFFSET_REDUND)
+#error ENV REDUND not supported
+#endif
+
+#if !defined(CONFIG_ENV_OFFSET) || !defined(CONFIG_ENV_SIZE)
+#error CONFIG_ENV_OFFSET or CONFIG_ENV_SIZE not defined
+#endif
+
+__weak int sata_get_env_dev(void)
+{
+	return CONFIG_SYS_SATA_ENV_DEV;
+}
+
+#ifdef CONFIG_CMD_SAVEENV
+static inline int write_env(struct blk_desc *sata, unsigned long size,
+			    unsigned long offset, void *buffer)
+{
+	uint blk_start, blk_cnt, n;
+
+	blk_start = ALIGN(offset, sata->blksz) / sata->blksz;
+	blk_cnt   = ALIGN(size, sata->blksz) / sata->blksz;
+
+	n = blk_dwrite(sata, blk_start, blk_cnt, buffer);
+
+	return (n == blk_cnt) ? 0 : -1;
+}
+
+static int env_sata_save(void)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
+	struct blk_desc *sata = NULL;
+	int env_sata, ret;
+
+	if (sata_initialize())
+		return 1;
+
+	env_sata = sata_get_env_dev();
+
+	sata = sata_get_dev(env_sata);
+	if (sata == NULL) {
+		printf("Unknown SATA(%d) device for environment!\n",
+		       env_sata);
+		return 1;
+	}
+
+	ret = env_export(env_new);
+	if (ret)
+		return 1;
+
+	printf("Writing to SATA(%d)...", env_sata);
+	if (write_env(sata, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, (u_char *)env_new)) {
+		puts("failed\n");
+		return 1;
+	}
+
+	puts("done\n");
+	return 0;
+}
+#endif /* CONFIG_CMD_SAVEENV */
+
+static inline int read_env(struct blk_desc *sata, unsigned long size,
+			   unsigned long offset, void *buffer)
+{
+	uint blk_start, blk_cnt, n;
+
+	blk_start = ALIGN(offset, sata->blksz) / sata->blksz;
+	blk_cnt   = ALIGN(size, sata->blksz) / sata->blksz;
+
+	n = blk_dread(sata, blk_start, blk_cnt, buffer);
+
+	return (n == blk_cnt) ? 0 : -1;
+}
+
+static void env_sata_load(void)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
+	struct blk_desc *sata = NULL;
+	int env_sata;
+
+	if (sata_initialize())
+		return -EIO;
+
+	env_sata = sata_get_env_dev();
+
+	sata = sata_get_dev(env_sata);
+	if (sata == NULL) {
+		printf("Unknown SATA(%d) device for environment!\n", env_sata);
+		return -EIO;
+	}
+
+	if (read_env(sata, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, buf)) {
+		env_set_default(NULL, 0);
+		return -EIO;
+	}
+
+	return env_import(buf, 1);
+}
+
+U_BOOT_ENV_LOCATION(sata) = {
+	.location	= ENVL_ESATA,
+	ENV_NAME("SATA")
+	.load		= env_sata_load,
+	.save		= env_save_ptr(env_sata_save),
+};

source/bootloader/u-boot-2020.01/env/sf.c

@@ -0,0 +1,324 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2000-2010
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Andreas Heppel <aheppel@sysgo.de>
+ *
+ * (C) Copyright 2008 Atmel Corporation
+ */
+#include <common.h>
+#include <dm.h>
+#include <env.h>
+#include <env_internal.h>
+#include <malloc.h>
+#include <spi.h>
+#include <spi_flash.h>
+#include <search.h>
+#include <errno.h>
+#include <dm/device-internal.h>
+#include <u-boot/crc.h>
+
+#ifndef CONFIG_SPL_BUILD
+#ifdef CONFIG_CMD_SAVEENV /* fix "env_sf_save not used" warning */
+#define CMD_SAVEENV
+#endif
+#define INITENV
+#endif
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+#ifdef CMD_SAVEENV
+static ulong env_offset		= CONFIG_ENV_OFFSET;
+static ulong env_new_offset	= CONFIG_ENV_OFFSET_REDUND;
+#endif
+
+#endif /* CONFIG_ENV_OFFSET_REDUND */
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static struct spi_flash *env_flash;
+
+static int setup_flash_device(void)
+{
+#ifdef CONFIG_DM_SPI_FLASH
+	struct udevice *new;
+	int	ret;
+
+	/* speed and mode will be read from DT */
+	ret = spi_flash_probe_bus_cs(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS,
+				     CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE,
+				     &new);
+	if (ret) {
+		env_set_default("spi_flash_probe_bus_cs() failed", 0);
+		return ret;
+	}
+
+	env_flash = dev_get_uclass_priv(new);
+#else
+
+	if (!env_flash) {
+		env_flash = spi_flash_probe(CONFIG_ENV_SPI_BUS,
+			CONFIG_ENV_SPI_CS,
+			CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE);
+		if (!env_flash) {
+			env_set_default("spi_flash_probe() failed", 0);
+			return -EIO;
+		}
+	}
+#endif
+	return 0;
+}
+
+#if defined(CONFIG_ENV_OFFSET_REDUND)
+#ifdef CMD_SAVEENV
+static int env_sf_save(void)
+{
+	env_t	env_new;
+	char	*saved_buffer = NULL, flag = ENV_REDUND_OBSOLETE;
+	u32	saved_size, saved_offset, sector;
+	int	ret;
+
+	ret = setup_flash_device();
+	if (ret)
+		return ret;
+
+	ret = env_export(&env_new);
+	if (ret)
+		return -EIO;
+	env_new.flags	= ENV_REDUND_ACTIVE;
+
+	if (gd->env_valid == ENV_VALID) {
+		env_new_offset = CONFIG_ENV_OFFSET_REDUND;
+		env_offset = CONFIG_ENV_OFFSET;
+	} else {
+		env_new_offset = CONFIG_ENV_OFFSET;
+		env_offset = CONFIG_ENV_OFFSET_REDUND;
+	}
+
+	/* Is the sector larger than the env (i.e. embedded) */
+	if (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE) {
+		saved_size = CONFIG_ENV_SECT_SIZE - CONFIG_ENV_SIZE;
+		saved_offset = env_new_offset + CONFIG_ENV_SIZE;
+		saved_buffer = memalign(ARCH_DMA_MINALIGN, saved_size);
+		if (!saved_buffer) {
+			ret = -ENOMEM;
+			goto done;
+		}
+		ret = spi_flash_read(env_flash, saved_offset,
+					saved_size, saved_buffer);
+		if (ret)
+			goto done;
+	}
+
+	sector = DIV_ROUND_UP(CONFIG_ENV_SIZE, CONFIG_ENV_SECT_SIZE);
+
+	puts("Erasing SPI flash...");
+	ret = spi_flash_erase(env_flash, env_new_offset,
+				sector * CONFIG_ENV_SECT_SIZE);
+	if (ret)
+		goto done;
+
+	puts("Writing to SPI flash...");
+
+	ret = spi_flash_write(env_flash, env_new_offset,
+		CONFIG_ENV_SIZE, &env_new);
+	if (ret)
+		goto done;
+
+	if (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE) {
+		ret = spi_flash_write(env_flash, saved_offset,
+					saved_size, saved_buffer);
+		if (ret)
+			goto done;
+	}
+
+	ret = spi_flash_write(env_flash, env_offset + offsetof(env_t, flags),
+				sizeof(env_new.flags), &flag);
+	if (ret)
+		goto done;
+
+	puts("done\n");
+
+	gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID : ENV_REDUND;
+
+	printf("Valid environment: %d\n", (int)gd->env_valid);
+
+ done:
+	if (saved_buffer)
+		free(saved_buffer);
+
+	return ret;
+}
+#endif /* CMD_SAVEENV */
+
+static int env_sf_load(void)
+{
+	int ret;
+	int read1_fail, read2_fail;
+	env_t *tmp_env1, *tmp_env2;
+
+	tmp_env1 = (env_t *)memalign(ARCH_DMA_MINALIGN,
+			CONFIG_ENV_SIZE);
+	tmp_env2 = (env_t *)memalign(ARCH_DMA_MINALIGN,
+			CONFIG_ENV_SIZE);
+	if (!tmp_env1 || !tmp_env2) {
+		env_set_default("malloc() failed", 0);
+		ret = -EIO;
+		goto out;
+	}
+
+	ret = setup_flash_device();
+	if (ret)
+		goto out;
+
+	read1_fail = spi_flash_read(env_flash, CONFIG_ENV_OFFSET,
+				    CONFIG_ENV_SIZE, tmp_env1);
+	read2_fail = spi_flash_read(env_flash, CONFIG_ENV_OFFSET_REDUND,
+				    CONFIG_ENV_SIZE, tmp_env2);
+
+	ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
+				read2_fail);
+
+	spi_flash_free(env_flash);
+	env_flash = NULL;
+out:
+	free(tmp_env1);
+	free(tmp_env2);
+
+	return ret;
+}
+#else
+#ifdef CMD_SAVEENV
+static int env_sf_save(void)
+{
+	u32	saved_size, saved_offset, sector;
+	char	*saved_buffer = NULL;
+	int	ret = 1;
+	env_t	env_new;
+
+	ret = setup_flash_device();
+	if (ret)
+		return ret;
+
+	/* Is the sector larger than the env (i.e. embedded) */
+	if (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE) {
+		saved_size = CONFIG_ENV_SECT_SIZE - CONFIG_ENV_SIZE;
+		saved_offset = CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE;
+		saved_buffer = malloc(saved_size);
+		if (!saved_buffer)
+			goto done;
+
+		ret = spi_flash_read(env_flash, saved_offset,
+			saved_size, saved_buffer);
+		if (ret)
+			goto done;
+	}
+
+	ret = env_export(&env_new);
+	if (ret)
+		goto done;
+
+	sector = DIV_ROUND_UP(CONFIG_ENV_SIZE, CONFIG_ENV_SECT_SIZE);
+
+	puts("Erasing SPI flash...");
+	ret = spi_flash_erase(env_flash, CONFIG_ENV_OFFSET,
+		sector * CONFIG_ENV_SECT_SIZE);
+	if (ret)
+		goto done;
+
+	puts("Writing to SPI flash...");
+	ret = spi_flash_write(env_flash, CONFIG_ENV_OFFSET,
+		CONFIG_ENV_SIZE, &env_new);
+	if (ret)
+		goto done;
+
+	if (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE) {
+		ret = spi_flash_write(env_flash, saved_offset,
+			saved_size, saved_buffer);
+		if (ret)
+			goto done;
+	}
+
+	ret = 0;
+	puts("done\n");
+
+ done:
+	if (saved_buffer)
+		free(saved_buffer);
+
+	return ret;
+}
+#endif /* CMD_SAVEENV */
+
+static int env_sf_load(void)
+{
+	int ret;
+	char *buf = NULL;
+
+	buf = (char *)memalign(ARCH_DMA_MINALIGN, CONFIG_ENV_SIZE);
+	if (!buf) {
+		env_set_default("malloc() failed", 0);
+		return -EIO;
+	}
+
+	ret = setup_flash_device();
+	if (ret)
+		goto out;
+
+	ret = spi_flash_read(env_flash,
+		CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, buf);
+	if (ret) {
+		env_set_default("spi_flash_read() failed", 0);
+		goto err_read;
+	}
+
+	ret = env_import(buf, 1);
+	if (!ret)
+		gd->env_valid = ENV_VALID;
+
+err_read:
+	spi_flash_free(env_flash);
+	env_flash = NULL;
+out:
+	free(buf);
+
+	return ret;
+}
+#endif
+
+#if CONFIG_ENV_ADDR != 0x0
+__weak void *env_sf_get_env_addr(void)
+{
+	return (void *)CONFIG_ENV_ADDR;
+}
+#endif
+
+#if defined(INITENV) && (CONFIG_ENV_ADDR != 0x0)
+static int env_sf_init(void)
+{
+	env_t *env_ptr = (env_t *)env_sf_get_env_addr();
+
+	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
+		gd->env_addr	= (ulong)&(env_ptr->data);
+		gd->env_valid	= 1;
+	} else {
+		gd->env_addr = (ulong)&default_environment[0];
+		gd->env_valid = 1;
+	}
+
+	return 0;
+}
+#endif
+
+U_BOOT_ENV_LOCATION(sf) = {
+	.location	= ENVL_SPI_FLASH,
+	ENV_NAME("SPI Flash")
+	.load		= env_sf_load,
+#ifdef CMD_SAVEENV
+	.save		= env_save_ptr(env_sf_save),
+#endif
+#if defined(INITENV) && (CONFIG_ENV_ADDR != 0x0)
+	.init		= env_sf_init,
+#endif
+};

source/bootloader/u-boot-2020.01/env/ubi.c

@@ -0,0 +1,184 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (c) Copyright 2012 by National Instruments,
+ *        Joe Hershberger <joe.hershberger@ni.com>
+ */
+
+#include <common.h>
+
+#include <command.h>
+#include <env.h>
+#include <env_internal.h>
+#include <errno.h>
+#include <malloc.h>
+#include <memalign.h>
+#include <search.h>
+#include <ubi_uboot.h>
+#undef crc32
+
+#define _QUOTE(x) #x
+#define QUOTE(x) _QUOTE(x)
+
+#if (CONFIG_ENV_UBI_VID_OFFSET == 0)
+ #define UBI_VID_OFFSET NULL
+#else
+ #define UBI_VID_OFFSET QUOTE(CONFIG_ENV_UBI_VID_OFFSET)
+#endif
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifdef CONFIG_CMD_SAVEENV
+#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
+static int env_ubi_save(void)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
+	int ret;
+
+	ret = env_export(env_new);
+	if (ret)
+		return ret;
+
+	if (ubi_part(CONFIG_ENV_UBI_PART, UBI_VID_OFFSET)) {
+		printf("\n** Cannot find mtd partition \"%s\"\n",
+		       CONFIG_ENV_UBI_PART);
+		return 1;
+	}
+
+	if (gd->env_valid == ENV_VALID) {
+		puts("Writing to redundant UBI... ");
+		if (ubi_volume_write(CONFIG_ENV_UBI_VOLUME_REDUND,
+				     (void *)env_new, CONFIG_ENV_SIZE)) {
+			printf("\n** Unable to write env to %s:%s **\n",
+			       CONFIG_ENV_UBI_PART,
+			       CONFIG_ENV_UBI_VOLUME_REDUND);
+			return 1;
+		}
+	} else {
+		puts("Writing to UBI... ");
+		if (ubi_volume_write(CONFIG_ENV_UBI_VOLUME,
+				     (void *)env_new, CONFIG_ENV_SIZE)) {
+			printf("\n** Unable to write env to %s:%s **\n",
+			       CONFIG_ENV_UBI_PART,
+			       CONFIG_ENV_UBI_VOLUME);
+			return 1;
+		}
+	}
+
+	puts("done\n");
+
+	gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID : ENV_REDUND;
+
+	return 0;
+}
+#else /* ! CONFIG_SYS_REDUNDAND_ENVIRONMENT */
+static int env_ubi_save(void)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
+	int ret;
+
+	ret = env_export(env_new);
+	if (ret)
+		return ret;
+
+	if (ubi_part(CONFIG_ENV_UBI_PART, UBI_VID_OFFSET)) {
+		printf("\n** Cannot find mtd partition \"%s\"\n",
+		       CONFIG_ENV_UBI_PART);
+		return 1;
+	}
+
+	if (ubi_volume_write(CONFIG_ENV_UBI_VOLUME, (void *)env_new,
+			     CONFIG_ENV_SIZE)) {
+		printf("\n** Unable to write env to %s:%s **\n",
+		       CONFIG_ENV_UBI_PART, CONFIG_ENV_UBI_VOLUME);
+		return 1;
+	}
+
+	puts("done\n");
+	return 0;
+}
+#endif /* CONFIG_SYS_REDUNDAND_ENVIRONMENT */
+#endif /* CONFIG_CMD_SAVEENV */
+
+#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
+static int env_ubi_load(void)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(char, env1_buf, CONFIG_ENV_SIZE);
+	ALLOC_CACHE_ALIGN_BUFFER(char, env2_buf, CONFIG_ENV_SIZE);
+	int read1_fail, read2_fail;
+	env_t *tmp_env1, *tmp_env2;
+
+	/*
+	 * In case we have restarted u-boot there is a chance that buffer
+	 * contains old environment (from the previous boot).
+	 * If UBI volume is zero size, ubi_volume_read() doesn't modify the
+	 * buffer.
+	 * We need to clear buffer manually here, so the invalid CRC will
+	 * cause setting default environment as expected.
+	 */
+	memset(env1_buf, 0x0, CONFIG_ENV_SIZE);
+	memset(env2_buf, 0x0, CONFIG_ENV_SIZE);
+
+	tmp_env1 = (env_t *)env1_buf;
+	tmp_env2 = (env_t *)env2_buf;
+
+	if (ubi_part(CONFIG_ENV_UBI_PART, UBI_VID_OFFSET)) {
+		printf("\n** Cannot find mtd partition \"%s\"\n",
+		       CONFIG_ENV_UBI_PART);
+		env_set_default(NULL, 0);
+		return -EIO;
+	}
+
+	read1_fail = ubi_volume_read(CONFIG_ENV_UBI_VOLUME, (void *)tmp_env1,
+				     CONFIG_ENV_SIZE);
+	if (read1_fail)
+		printf("\n** Unable to read env from %s:%s **\n",
+		       CONFIG_ENV_UBI_PART, CONFIG_ENV_UBI_VOLUME);
+
+	read2_fail = ubi_volume_read(CONFIG_ENV_UBI_VOLUME_REDUND,
+				     (void *)tmp_env2, CONFIG_ENV_SIZE);
+	if (read2_fail)
+		printf("\n** Unable to read redundant env from %s:%s **\n",
+		       CONFIG_ENV_UBI_PART, CONFIG_ENV_UBI_VOLUME_REDUND);
+
+	return env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
+							 read2_fail);
+}
+#else /* ! CONFIG_SYS_REDUNDAND_ENVIRONMENT */
+static int env_ubi_load(void)
+{
+	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
+
+	/*
+	 * In case we have restarted u-boot there is a chance that buffer
+	 * contains old environment (from the previous boot).
+	 * If UBI volume is zero size, ubi_volume_read() doesn't modify the
+	 * buffer.
+	 * We need to clear buffer manually here, so the invalid CRC will
+	 * cause setting default environment as expected.
+	 */
+	memset(buf, 0x0, CONFIG_ENV_SIZE);
+
+	if (ubi_part(CONFIG_ENV_UBI_PART, UBI_VID_OFFSET)) {
+		printf("\n** Cannot find mtd partition \"%s\"\n",
+		       CONFIG_ENV_UBI_PART);
+		env_set_default(NULL, 0);
+		return -EIO;
+	}
+
+	if (ubi_volume_read(CONFIG_ENV_UBI_VOLUME, buf, CONFIG_ENV_SIZE)) {
+		printf("\n** Unable to read env from %s:%s **\n",
+		       CONFIG_ENV_UBI_PART, CONFIG_ENV_UBI_VOLUME);
+		env_set_default(NULL, 0);
+		return -EIO;
+	}
+
+	return env_import(buf, 1);
+}
+#endif /* CONFIG_SYS_REDUNDAND_ENVIRONMENT */
+
+U_BOOT_ENV_LOCATION(ubi) = {
+	.location	= ENVL_UBI,
+	ENV_NAME("UBI")
+	.load		= env_ubi_load,
+	.save		= env_save_ptr(env_ubi_save),
+};