GPMC在DTS中配置

keming tang

大家好！我想在GPMC总线上挂在两个设备，一个Nand Flash作为存储程序和文件系统等使用。另一个设备FPGA模拟为Nor Flash设备作为与ARM之间的通信接口。请问在DTS文件中，要如何描述两个设备资源，驱动大概怎么写？大神们提供一下思路，谢谢！

Nand FLASH 挂在CS0， FPGA挂在CS1。

10 年多前

0 Yaoming Qin 10 年多前

TI__Mastermind 35157 points

关于FPGA部分，暂时我没想到很好的方法，您可能需要自己定义dts 根据您的应用定义接口吧。

关于nand 部分，程序存储实在文件系统里的吗？如果是，应该是机遇mtd存储接口的吧。

0 keming tang 10 年多前回复 Yaoming Qin

Intellectual 340 points

谢谢，Yaoming！

nand 部分是Mtd接口，在DTS中定义如下可正常工作：

&gpmc {
   status = "okay";
   pinctrl-names = "default", "sleep";
   pinctrl-0 = <&nandflash_pins_default>;
   pinctrl-1 = <&nandflash_pins_sleep>;
   ranges = <0 0 0x08000000 0x8000000>;   /* CS0: NAND */
   nand@0,0 {
       reg = <0 0 0>; /* CS0, offset 0 */
       ti,nand-ecc-opt = "bch8";
       ti,elm-id = <&elm>;
       nand-bus-width = <8>;
       gpmc,device-width = <1>;
       gpmc,sync-clk-ps = <0>;
       gpmc,cs-on-ns = <0>;
       gpmc,cs-rd-off-ns = <44>;
       gpmc,cs-wr-off-ns = <44>;
       gpmc,adv-on-ns = <6>;
       gpmc,adv-rd-off-ns = <34>;
       gpmc,adv-wr-off-ns = <44>;
       gpmc,we-on-ns = <0>;
       gpmc,we-off-ns = <40>;
       gpmc,oe-on-ns = <0>;
       gpmc,oe-off-ns = <54>;
       gpmc,access-ns = <64>;
       gpmc,rd-cycle-ns = <82>;
       gpmc,wr-cycle-ns = <82>;
       gpmc,wait-on-read = "true";
       gpmc,wait-on-write = "true";
       gpmc,bus-turnaround-ns = <0>;
       gpmc,cycle2cycle-delay-ns = <0>;
       gpmc,clk-activation-ns = <0>;
       gpmc,wait-monitoring-ns = <0>;
       gpmc,wr-access-ns = <40>;
       gpmc,wr-data-mux-bus-ns = <0>;
       /* MTD partition table */
       /* All SPL-* partitions are sized to minimal length
       * which can be independently programmable. For
       * NAND flash this is equal to size of erase-block */
       #address-cells = <1>;
       #size-cells = <1>;
       partition@0 {
           label = "NAND.SPL";
           reg = <0x00000000 0x000020000>;
       };
       partition@1 {
           label = "NAND.SPL.backup1";
           reg = <0x00020000 0x00020000>;
       };
       partition@2 {
           label = "NAND.SPL.backup2";
           reg = <0x00040000 0x00020000>;
       };
       partition@3 {
           label = "NAND.SPL.backup3";
           reg = <0x00060000 0x00020000>;
       };
       partition@4 {
           label = "NAND.u-boot-spl-os";
           reg = <0x00080000 0x00040000>;
       };
       partition@5 {
           label = "NAND.u-boot";
           reg = <0x000C0000 0x00100000>;
       };
       partition@6 {
           label = "NAND.u-boot-env";
           reg = <0x001C0000 0x00020000>;
       };
       partition@7 {
           label = "NAND.u-boot-env.backup1";
           reg = <0x001E0000 0x00020000>;
       };
       partition@8 {
           label = "NAND.kernel";
           reg = <0x00200000 0x00800000>;
       };
       partition@9 {
           label = "NAND.file-system";
           reg = <0x00A00000 0x07600000>;
       };
   };
};

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GPMC在DTS中配置