GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)
This commit is contained in:
@@ -0,0 +1,12 @@
|
||||
.. SPDX-License-Identifier: GPL-2.0+
|
||||
|
||||
Emulation
|
||||
=========
|
||||
|
||||
.. toctree::
|
||||
:maxdepth: 2
|
||||
|
||||
qemu-arm
|
||||
qemu-mips
|
||||
qemu-riscv
|
||||
qemu-x86
|
||||
@@ -0,0 +1,82 @@
|
||||
.. SPDX-License-Identifier: GPL-2.0+
|
||||
.. Copyright (C) 2017, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
|
||||
|
||||
QEMU ARM
|
||||
========
|
||||
|
||||
QEMU for ARM supports a special 'virt' machine designed for emulation and
|
||||
virtualization purposes. This document describes how to run U-Boot under it.
|
||||
Both 32-bit ARM and AArch64 are supported.
|
||||
|
||||
The 'virt' platform provides the following as the basic functionality:
|
||||
|
||||
- A freely configurable amount of CPU cores
|
||||
- U-Boot loaded and executing in the emulated flash at address 0x0
|
||||
- A generated device tree blob placed at the start of RAM
|
||||
- A freely configurable amount of RAM, described by the DTB
|
||||
- A PL011 serial port, discoverable via the DTB
|
||||
- An ARMv7/ARMv8 architected timer
|
||||
- PSCI for rebooting the system
|
||||
- A generic ECAM-based PCI host controller, discoverable via the DTB
|
||||
|
||||
Additionally, a number of optional peripherals can be added to the PCI bus.
|
||||
|
||||
Building U-Boot
|
||||
---------------
|
||||
Set the CROSS_COMPILE environment variable as usual, and run:
|
||||
|
||||
- For ARM::
|
||||
|
||||
make qemu_arm_defconfig
|
||||
make
|
||||
|
||||
- For AArch64::
|
||||
|
||||
make qemu_arm64_defconfig
|
||||
make
|
||||
|
||||
Running U-Boot
|
||||
--------------
|
||||
The minimal QEMU command line to get U-Boot up and running is:
|
||||
|
||||
- For ARM::
|
||||
|
||||
qemu-system-arm -machine virt -bios u-boot.bin
|
||||
|
||||
- For AArch64::
|
||||
|
||||
qemu-system-aarch64 -machine virt -cpu cortex-a57 -bios u-boot.bin
|
||||
|
||||
Note that for some odd reason qemu-system-aarch64 needs to be explicitly
|
||||
told to use a 64-bit CPU or it will boot in 32-bit mode.
|
||||
|
||||
Additional persistent U-boot environment support can be added as follows:
|
||||
|
||||
- Create envstore.img using qemu-img::
|
||||
|
||||
qemu-img create -f raw envstore.img 64M
|
||||
|
||||
- Add a pflash drive parameter to the command line::
|
||||
|
||||
-drive if=pflash,format=raw,index=1,file=envstore.img
|
||||
|
||||
Additional peripherals that have been tested to work in both U-Boot and Linux
|
||||
can be enabled with the following command line parameters:
|
||||
|
||||
- To add a Serial ATA disk via an Intel ICH9 AHCI controller, pass e.g.::
|
||||
|
||||
-drive if=none,file=disk.img,id=mydisk -device ich9-ahci,id=ahci -device ide-drive,drive=mydisk,bus=ahci.0
|
||||
|
||||
- To add an Intel E1000 network adapter, pass e.g.::
|
||||
|
||||
-netdev user,id=net0 -device e1000,netdev=net0
|
||||
|
||||
- To add an EHCI-compliant USB host controller, pass e.g.::
|
||||
|
||||
-device usb-ehci,id=ehci
|
||||
|
||||
- To add a NVMe disk, pass e.g.::
|
||||
|
||||
-drive if=none,file=disk.img,id=mydisk -device nvme,drive=mydisk,serial=foo
|
||||
|
||||
These have been tested in QEMU 2.9.0 but should work in at least 2.5.0 as well.
|
||||
@@ -0,0 +1,234 @@
|
||||
.. SPDX-License-Identifier: GPL-2.0+
|
||||
.. sectionauthor:: Vlad Lungu <vlad.lungu@windriver.com>
|
||||
|
||||
QEMU MIPS
|
||||
=========
|
||||
|
||||
Qemu is a full system emulator. See http://www.nongnu.org/qemu/
|
||||
|
||||
Limitations & comments
|
||||
----------------------
|
||||
Supports the "-M mips" configuration of qemu: serial,NE2000,IDE.
|
||||
Supports little and big endian as well as 32 bit and 64 bit.
|
||||
Derived from au1x00 with a lot of things cut out.
|
||||
|
||||
Supports emulated flash (patch Jean-Christophe PLAGNIOL-VILLARD) with
|
||||
recent qemu versions. When using emulated flash, launch with
|
||||
-pflash <filename> and erase mips_bios.bin.
|
||||
|
||||
|
||||
Notes for the Qemu MIPS port
|
||||
----------------------------
|
||||
|
||||
Example usage
|
||||
^^^^^^^^^^^^^
|
||||
|
||||
Using u-boot.bin as ROM (replaces Qemu monitor):
|
||||
|
||||
32 bit, big endian::
|
||||
|
||||
# make qemu_mips
|
||||
# qemu-system-mips -M mips -bios u-boot.bin -nographic
|
||||
|
||||
32 bit, little endian::
|
||||
|
||||
# make qemu_mipsel
|
||||
# qemu-system-mipsel -M mips -bios u-boot.bin -nographic
|
||||
|
||||
64 bit, big endian::
|
||||
|
||||
# make qemu_mips64
|
||||
# qemu-system-mips64 -cpu MIPS64R2-generic -M mips -bios u-boot.bin -nographic
|
||||
|
||||
64 bit, little endian::
|
||||
|
||||
# make qemu_mips64el
|
||||
# qemu-system-mips64el -cpu MIPS64R2-generic -M mips -bios u-boot.bin -nographic
|
||||
|
||||
or using u-boot.bin from emulated flash:
|
||||
|
||||
if you use a qemu version after commit 4224
|
||||
|
||||
.. code-block:: none
|
||||
|
||||
create image:
|
||||
# dd of=flash bs=1k count=4k if=/dev/zero
|
||||
# dd of=flash bs=1k conv=notrunc if=u-boot.bin
|
||||
start it (see above):
|
||||
# qemu-system-mips[64][el] [-cpu MIPS64R2-generic] -M mips -pflash flash -nographic
|
||||
|
||||
Download kernel + initrd
|
||||
^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
On ftp://ftp.denx.de/pub/contrib/Jean-Christophe_Plagniol-Villard/qemu_mips/
|
||||
you can downland::
|
||||
|
||||
#config to build the kernel
|
||||
qemu_mips_defconfig
|
||||
#patch to fix mips interrupt init on 2.6.24.y kernel
|
||||
qemu_mips_kernel.patch
|
||||
initrd.gz
|
||||
vmlinux
|
||||
vmlinux.bin
|
||||
System.map
|
||||
|
||||
Generate uImage
|
||||
^^^^^^^^^^^^^^^
|
||||
|
||||
.. code-block:: none
|
||||
|
||||
# tools/mkimage -A mips -O linux -T kernel -C gzip -a 0x80010000 -e 0x80245650 -n "Linux 2.6.24.y" -d vmlinux.bin.gz uImage
|
||||
|
||||
Copy uImage to Flash
|
||||
^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
.. code-block:: none
|
||||
|
||||
# dd if=uImage bs=1k conv=notrunc seek=224 of=flash
|
||||
|
||||
Generate Ide Disk
|
||||
^^^^^^^^^^^^^^^^^
|
||||
|
||||
.. code-block:: none
|
||||
|
||||
# dd of=ide bs=1k cout=100k if=/dev/zero
|
||||
|
||||
# sfdisk -C 261 -d ide
|
||||
# partition table of ide
|
||||
unit: sectors
|
||||
|
||||
ide1 : start= 63, size= 32067, Id=83
|
||||
ide2 : start= 32130, size= 32130, Id=83
|
||||
ide3 : start= 64260, size= 4128705, Id=83
|
||||
ide4 : start= 0, size= 0, Id= 0
|
||||
|
||||
Copy to ide
|
||||
^^^^^^^^^^^
|
||||
|
||||
.. code-block:: none
|
||||
|
||||
# dd if=uImage bs=512 conv=notrunc seek=63 of=ide
|
||||
|
||||
Generate ext2 on part 2 on Copy uImage and initrd.gz
|
||||
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
.. code-block:: none
|
||||
|
||||
# Attached as loop device ide offset = 32130 * 512
|
||||
# losetup -o 16450560 -f ide
|
||||
# Format as ext2 ( arg2 : nb blocks)
|
||||
# mke2fs /dev/loop0 16065
|
||||
# losetup -d /dev/loop0
|
||||
# Mount and copy uImage and initrd.gz to it
|
||||
# mount -o loop,offset=16450560 -t ext2 ide /mnt
|
||||
# mkdir /mnt/boot
|
||||
# cp {initrd.gz,uImage} /mnt/boot/
|
||||
# Umount it
|
||||
# umount /mnt
|
||||
|
||||
Set Environment
|
||||
^^^^^^^^^^^^^^^
|
||||
|
||||
.. code-block:: none
|
||||
|
||||
setenv rd_start 0x80800000
|
||||
setenv rd_size 2663940
|
||||
setenv kernel BFC38000
|
||||
setenv oad_addr 80500000
|
||||
setenv load_addr2 80F00000
|
||||
setenv kernel_flash BFC38000
|
||||
setenv load_addr_hello 80200000
|
||||
setenv bootargs 'root=/dev/ram0 init=/bin/sh'
|
||||
setenv load_rd_ext2 'ide res; ext2load ide 0:2 ${rd_start} /boot/initrd.gz'
|
||||
setenv load_rd_tftp 'tftp ${rd_start} /initrd.gz'
|
||||
setenv load_kernel_hda 'ide res; diskboot ${load_addr} 0:2'
|
||||
setenv load_kernel_ext2 'ide res; ext2load ide 0:2 ${load_addr} /boot/uImage'
|
||||
setenv load_kernel_tftp 'tftp ${load_addr} /qemu_mips/uImage'
|
||||
setenv boot_ext2_ext2 'run load_rd_ext2; run load_kernel_ext2; run addmisc; bootm ${load_addr}'
|
||||
setenv boot_ext2_flash 'run load_rd_ext2; run addmisc; bootm ${kernel_flash}'
|
||||
setenv boot_ext2_hda 'run load_rd_ext2; run load_kernel_hda; run addmisc; bootm ${load_addr}'
|
||||
setenv boot_ext2_tftp 'run load_rd_ext2; run load_kernel_tftp; run addmisc; bootm ${load_addr}'
|
||||
setenv boot_tftp_hda 'run load_rd_tftp; run load_kernel_hda; run addmisc; bootm ${load_addr}'
|
||||
setenv boot_tftp_ext2 'run load_rd_tftp; run load_kernel_ext2; run addmisc; bootm ${load_addr}'
|
||||
setenv boot_tftp_flash 'run load_rd_tftp; run addmisc; bootm ${kernel_flash}'
|
||||
setenv boot_tftp_tftp 'run load_rd_tftp; run load_kernel_tftp; run addmisc; bootm ${load_addr}'
|
||||
setenv load_hello_tftp 'tftp ${load_addr_hello} /examples/hello_world.bin'
|
||||
setenv go_tftp 'run load_hello_tftp; go ${load_addr_hello}'
|
||||
setenv addmisc 'setenv bootargs ${bootargs} console=ttyS0,${baudrate} rd_start=${rd_start} rd_size=${rd_size} ethaddr=${ethaddr}'
|
||||
setenv bootcmd 'run boot_tftp_flash'
|
||||
|
||||
Now you can boot from flash, ide, ide+ext2 and tfp::
|
||||
|
||||
# qemu-system-mips -M mips -pflash flash -monitor null -nographic -net nic -net user -tftp `pwd` -hda ide
|
||||
|
||||
|
||||
How to debug U-Boot
|
||||
-------------------
|
||||
|
||||
In order to debug U-Boot you need to start qemu with gdb server support (-s)
|
||||
and waiting the connection to start the CPU (-S)
|
||||
|
||||
.. code-block:: none
|
||||
|
||||
# qemu-system-mips -S -s -M mips -pflash flash -monitor null -nographic -net nic -net user -tftp `pwd` -hda ide
|
||||
|
||||
in an other console you start gdb
|
||||
|
||||
Debugging of U-Boot Before Relocation
|
||||
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
Before relocation, the addresses in the ELF file can be used without any problems
|
||||
by connecting to the gdb server localhost:1234
|
||||
|
||||
.. code-block:: none
|
||||
|
||||
# mipsel-unknown-linux-gnu-gdb u-boot
|
||||
GNU gdb 6.6
|
||||
Copyright (C) 2006 Free Software Foundation, Inc.
|
||||
GDB is free software, covered by the GNU General Public License, and you are
|
||||
welcome to change it and/or distribute copies of it under certain conditions.
|
||||
Type "show copying" to see the conditions.
|
||||
There is absolutely no warranty for GDB. Type "show warranty" for details.
|
||||
This GDB was configured as "--host=i486-linux-gnu --target=mipsel-unknown-linux-gnu"...
|
||||
(gdb) target remote localhost:1234
|
||||
Remote debugging using localhost:1234
|
||||
_start () at start.S:64
|
||||
64 RVECENT(reset,0) /* U-Boot entry point */
|
||||
Current language: auto; currently asm
|
||||
(gdb) b board.c:289
|
||||
Breakpoint 1 at 0xbfc00cc8: file board.c, line 289.
|
||||
(gdb) c
|
||||
Continuing.
|
||||
|
||||
Breakpoint 1, board_init_f (bootflag=<value optimized out>) at board.c:290
|
||||
290 relocate_code (addr_sp, id, addr);
|
||||
Current language: auto; currently c
|
||||
(gdb) p/x addr
|
||||
$1 = 0x87fa0000
|
||||
|
||||
Debugging of U-Boot After Relocation
|
||||
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
For debugging U-Boot after relocation we need to know the address to which
|
||||
U-Boot relocates itself to 0x87fa0000 by default.
|
||||
And replace the symbol table to this offset.
|
||||
|
||||
.. code-block:: none
|
||||
|
||||
(gdb) symbol-file
|
||||
Discard symbol table from `/private/u-boot-arm/u-boot'? (y or n) y
|
||||
Error in re-setting breakpoint 1:
|
||||
No symbol table is loaded. Use the "file" command.
|
||||
No symbol file now.
|
||||
(gdb) add-symbol-file u-boot 0x87fa0000
|
||||
add symbol table from file "u-boot" at
|
||||
.text_addr = 0x87fa0000
|
||||
(y or n) y
|
||||
Reading symbols from /private/u-boot-arm/u-boot...done.
|
||||
Breakpoint 1 at 0x87fa0cc8: file board.c, line 289.
|
||||
(gdb) c
|
||||
Continuing.
|
||||
|
||||
Program received signal SIGINT, Interrupt.
|
||||
0xffffffff87fa0de4 in udelay (usec=<value optimized out>) at time.c:78
|
||||
78 while ((tmo - read_c0_count()) < 0x7fffffff)
|
||||
@@ -0,0 +1,107 @@
|
||||
.. SPDX-License-Identifier: GPL-2.0+
|
||||
.. Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
|
||||
|
||||
QEMU RISC-V
|
||||
===========
|
||||
|
||||
QEMU for RISC-V supports a special 'virt' machine designed for emulation and
|
||||
virtualization purposes. This document describes how to run U-Boot under it.
|
||||
Both 32-bit and 64-bit targets are supported, running in either machine or
|
||||
supervisor mode.
|
||||
|
||||
The QEMU virt machine models a generic RISC-V virtual machine with support for
|
||||
the VirtIO standard networking and block storage devices. It has CLINT, PLIC,
|
||||
16550A UART devices in addition to VirtIO and it also uses device-tree to pass
|
||||
configuration information to guest software. It implements RISC-V privileged
|
||||
architecture spec v1.10.
|
||||
|
||||
Building U-Boot
|
||||
---------------
|
||||
Set the CROSS_COMPILE environment variable as usual, and run:
|
||||
|
||||
- For 32-bit RISC-V::
|
||||
|
||||
make qemu-riscv32_defconfig
|
||||
make
|
||||
|
||||
- For 64-bit RISC-V::
|
||||
|
||||
make qemu-riscv64_defconfig
|
||||
make
|
||||
|
||||
This will compile U-Boot for machine mode. To build supervisor mode binaries,
|
||||
use the configurations qemu-riscv32_smode_defconfig and
|
||||
qemu-riscv64_smode_defconfig instead. Note that U-Boot running in supervisor
|
||||
mode requires a supervisor binary interface (SBI), such as RISC-V OpenSBI.
|
||||
|
||||
Running U-Boot
|
||||
--------------
|
||||
The minimal QEMU command line to get U-Boot up and running is:
|
||||
|
||||
- For 32-bit RISC-V::
|
||||
|
||||
qemu-system-riscv32 -nographic -machine virt -kernel u-boot
|
||||
|
||||
- For 64-bit RISC-V::
|
||||
|
||||
qemu-system-riscv64 -nographic -machine virt -kernel u-boot
|
||||
|
||||
The commands above create targets with 128MiB memory by default.
|
||||
A freely configurable amount of RAM can be created via the '-m'
|
||||
parameter. For example, '-m 2G' creates 2GiB memory for the target,
|
||||
and the memory node in the embedded DTB created by QEMU reflects
|
||||
the new setting.
|
||||
|
||||
For instructions on how to run U-Boot in supervisor mode on QEMU
|
||||
with OpenSBI, see the documentation available with OpenSBI:
|
||||
https://github.com/riscv/opensbi/blob/master/docs/platform/qemu_virt.md
|
||||
|
||||
These have been tested in QEMU 3.0.0.
|
||||
|
||||
Running U-Boot SPL
|
||||
------------------
|
||||
In the default SPL configuration, U-Boot SPL starts in machine mode. U-Boot
|
||||
proper and OpenSBI (FW_DYNAMIC firmware) are bundled as FIT image and made
|
||||
available to U-Boot SPL. Both are then loaded by U-Boot SPL and the location
|
||||
of U-Boot proper is passed to OpenSBI. After initialization, U-Boot proper is
|
||||
started in supervisor mode by OpenSBI.
|
||||
|
||||
OpenSBI must be compiled before compiling U-Boot. Version 0.4 and higher is
|
||||
supported by U-Boot. Clone the OpenSBI repository and run the following command.
|
||||
|
||||
.. code-block:: console
|
||||
|
||||
git clone https://github.com/riscv/opensbi.git
|
||||
cd opensbi
|
||||
make PLATFORM=qemu/virt
|
||||
|
||||
See the OpenSBI documentation for full details:
|
||||
https://github.com/riscv/opensbi/blob/master/docs/platform/qemu_virt.md
|
||||
|
||||
To make the FW_DYNAMIC binary (build/platform/qemu/virt/firmware/fw_dynamic.bin)
|
||||
available to U-Boot, either copy it into the U-Boot root directory or specify
|
||||
its location with the OPENSBI environment variable. Afterwards, compile U-Boot
|
||||
with the following commands.
|
||||
|
||||
- For 32-bit RISC-V::
|
||||
|
||||
make qemu-riscv32_spl_defconfig
|
||||
make
|
||||
|
||||
- For 64-bit RISC-V::
|
||||
|
||||
make qemu-riscv64_spl_defconfig
|
||||
make
|
||||
|
||||
The minimal QEMU commands to run U-Boot SPL in both 32-bit and 64-bit
|
||||
configurations are:
|
||||
|
||||
- For 32-bit RISC-V::
|
||||
|
||||
qemu-system-riscv32 -nographic -machine virt -kernel spl/u-boot-spl \
|
||||
-device loader,file=u-boot.itb,addr=0x80200000
|
||||
|
||||
- For 64-bit RISC-V::
|
||||
|
||||
qemu-system-riscv64 -nographic -machine virt -kernel spl/u-boot-spl \
|
||||
-device loader,file=u-boot.itb,addr=0x80200000
|
||||
@@ -0,0 +1,118 @@
|
||||
.. SPDX-License-Identifier: GPL-2.0+
|
||||
.. sectionauthor:: Bin Meng <bmeng.cn@gmail.com>
|
||||
|
||||
QEMU x86
|
||||
========
|
||||
|
||||
Build instructions for bare mode
|
||||
--------------------------------
|
||||
|
||||
To build u-boot.rom for QEMU x86 targets, just simply run::
|
||||
|
||||
$ make qemu-x86_defconfig (for 32-bit)
|
||||
$ make qemu-x86_64_defconfig (for 64-bit)
|
||||
$ make all
|
||||
|
||||
Note this default configuration will build a U-Boot for the QEMU x86 i440FX
|
||||
board. To build a U-Boot against QEMU x86 Q35 board, you can change the build
|
||||
configuration during the 'make menuconfig' process like below::
|
||||
|
||||
Device Tree Control --->
|
||||
...
|
||||
(qemu-x86_q35) Default Device Tree for DT control
|
||||
|
||||
Test with QEMU for bare mode
|
||||
----------------------------
|
||||
|
||||
QEMU is a fancy emulator that can enable us to test U-Boot without access to
|
||||
a real x86 board. Please make sure your QEMU version is 2.3.0 or above test
|
||||
U-Boot. To launch QEMU with u-boot.rom, call QEMU as follows::
|
||||
|
||||
$ qemu-system-i386 -nographic -bios path/to/u-boot.rom
|
||||
|
||||
This will instantiate an emulated x86 board with i440FX and PIIX chipset. QEMU
|
||||
also supports emulating an x86 board with Q35 and ICH9 based chipset, which is
|
||||
also supported by U-Boot. To instantiate such a machine, call QEMU with::
|
||||
|
||||
$ qemu-system-i386 -nographic -bios path/to/u-boot.rom -M q35
|
||||
|
||||
Note by default QEMU instantiated boards only have 128 MiB system memory. But
|
||||
it is enough to have U-Boot boot and function correctly. You can increase the
|
||||
system memory by pass '-m' parameter to QEMU if you want more memory::
|
||||
|
||||
$ qemu-system-i386 -nographic -bios path/to/u-boot.rom -m 1024
|
||||
|
||||
This creates a board with 1 GiB system memory. Currently U-Boot for QEMU only
|
||||
supports 3 GiB maximum system memory and reserves the last 1 GiB address space
|
||||
for PCI device memory-mapped I/O and other stuff, so the maximum value of '-m'
|
||||
would be 3072.
|
||||
|
||||
QEMU emulates a graphic card which U-Boot supports. Removing '-nographic' will
|
||||
show QEMU's VGA console window. Note this will disable QEMU's serial output.
|
||||
If you want to check both consoles, use '-serial stdio'.
|
||||
|
||||
Multicore is also supported by QEMU via '-smp n' where n is the number of cores
|
||||
to instantiate. Note, the maximum supported CPU number in QEMU is 255.
|
||||
|
||||
U-Boot uses 'distro_bootcmd' by default when booting on x86 QEMU. This tries to
|
||||
load a boot script, kernel, and ramdisk from several different interfaces. For
|
||||
the default boot order, see 'qemu-x86.h'. For more information, see
|
||||
'README.distro'. Most Linux distros can be booted by writing a uboot script.
|
||||
For example, Debian (stretch) can be booted by creating a script file named
|
||||
'boot.txt' with the contents::
|
||||
|
||||
setenv bootargs root=/dev/sda1 ro
|
||||
load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_r} /vmlinuz
|
||||
load ${devtype} ${devnum}:${distro_bootpart} ${ramdisk_addr_r} /initrd.img
|
||||
zboot ${kernel_addr_r} - ${ramdisk_addr_r} ${filesize}
|
||||
|
||||
Then compile and install it with::
|
||||
|
||||
$ apt install u-boot-tools && \
|
||||
mkimage -T script -C none -n "Boot script" -d boot.txt /boot/boot.scr
|
||||
|
||||
The fw_cfg interface in QEMU also provides information about kernel data,
|
||||
initrd, command-line arguments and more. U-Boot supports directly accessing
|
||||
these informtion from fw_cfg interface, which saves the time of loading them
|
||||
from hard disk or network again, through emulated devices. To use it , simply
|
||||
providing them in QEMU command line::
|
||||
|
||||
$ qemu-system-i386 -nographic -bios path/to/u-boot.rom -m 1024 \
|
||||
-kernel /path/to/bzImage -append 'root=/dev/ram console=ttyS0' \
|
||||
-initrd /path/to/initrd -smp 8
|
||||
|
||||
Note: -initrd and -smp are both optional
|
||||
|
||||
Then start QEMU, in U-Boot command line use the following U-Boot command to
|
||||
setup kernel::
|
||||
|
||||
=> qfw
|
||||
qfw - QEMU firmware interface
|
||||
|
||||
Usage:
|
||||
qfw <command>
|
||||
- list : print firmware(s) currently loaded
|
||||
- cpus : print online cpu number
|
||||
- load <kernel addr> <initrd addr> : load kernel and initrd (if any) and setup for zboot
|
||||
|
||||
=> qfw load
|
||||
loading kernel to address 01000000 size 5d9d30 initrd 04000000 size 1b1ab50
|
||||
|
||||
Here the kernel (bzImage) is loaded to 01000000 and initrd is to 04000000. Then,
|
||||
'zboot' can be used to boot the kernel::
|
||||
|
||||
=> zboot 01000000 - 04000000 1b1ab50
|
||||
|
||||
To run 64-bit U-Boot, qemu-system-x86_64 should be used instead, e.g.::
|
||||
|
||||
$ qemu-system-x86_64 -nographic -bios path/to/u-boot.rom
|
||||
|
||||
A specific CPU can be specified via the '-cpu' parameter but please make
|
||||
sure the specified CPU supports 64-bit like '-cpu core2duo'. Conversely
|
||||
'-cpu pentium' won't work for obvious reasons that the processor only
|
||||
supports 32-bit.
|
||||
|
||||
Note 64-bit support is very preliminary at this point. Lots of features
|
||||
are missing in the 64-bit world. One notable feature is the VGA console
|
||||
support which is currently missing, so that you must specify '-nographic'
|
||||
to get 64-bit U-Boot up and running.
|
||||
Reference in New Issue
Block a user