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

source/bootloader/u-boot-2020.01/doc/device-tree-bindings/memory-controllers/st,stm32-fmc.txt

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+ST, stm32 flexible memory controller Drive
+Required properties:
+- compatible	: "st,stm32-fmc"
+- reg		: fmc controller base address
+- clocks	: fmc controller clock
+u-boot,dm-pre-reloc: flag to initialize memory before relocation.
+
+on-board sdram memory attributes:
+- st,sdram-control : parameters for sdram configuration, in this order:
+  number of columns
+  number of rows
+  memory width
+  number of intenal banks in memory
+  cas latency
+  read burst enable or disable
+  read pipe delay
+
+- st,sdram-timing: timings for sdram, in this order:
+  tmrd
+  txsr
+  tras
+  trc
+  trp
+  trcd
+
+There is device tree include file at :
+include/dt-bindings/memory/stm32-sdram.h to define sdram control and timing
+parameters as MACROS.
+
+Example:
+	fmc: fmc@A0000000 {
+	     compatible = "st,stm32-fmc";
+	     reg = <0xA0000000 0x1000>;
+	     clocks = <&rcc 0 64>;
+	     u-boot,dm-pre-reloc;
+	};
+
+	&fmc {
+		pinctrl-0 = <&fmc_pins>;
+		pinctrl-names = "default";
+		status = "okay";
+
+		/* sdram memory configuration from sdram datasheet */
+		bank1: bank@0 {
+		       st,sdram-control = /bits/ 8 <NO_COL_8 NO_ROW_12 MWIDTH_16 BANKS_2
+						CAS_3 RD_BURST_EN RD_PIPE_DL_0>;
+		       st,sdram-timing = /bits/ 8 <TMRD_1 TXSR_60 TRAS_42 TRC_60 TRP_18
+						TRCD_18>;
+		};
+
+		/* sdram memory configuration from sdram datasheet */
+		bank2: bank@1 {
+		       st,sdram-control = /bits/ 8 <NO_COL_8 NO_ROW_12 MWIDTH_16 BANKS_2
+						CAS_3 RD_BURST_EN RD_PIPE_DL_0>;
+		       st,sdram-timing = /bits/ 8 <TMRD_1 TXSR_60 TRAS_42 TRC_60 TRP_18
+						TRCD_18>;
+		};
+	}