各位好，现在想要在原有板子基础上增加一片nandflash，使用片选csn1，原nand使用csn0不变，两片nand型号都一样。现在尝试着编写的Devicetree如下：
&gpmc {
status = "okay";
pinctrl-names = "default", "sleep";
pinctrl-0 = <&nandflash_pins_default>;
pinctrl-1 = <&nandflash_pins_sleep>;
ranges = <0 0 0x08000000 0x10000000>,<1 0 0x18000000 0x10000000>; /* CS0: NAND */ /*CS1: 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 0x0F600000>;
};
};
nand@1,0 {
reg = <1 0 0>; /* CS1, 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.file-system";
reg = <0x00000000 0x10000000>;
};
};
};
有几点疑问如下：
1.其中 ranges 属性第一个字段1表示csn1片选，第二个字段为固定值0，第三个字段为物理地址0x18000000，第四个字段为nand大小512MB。
不知理解是否正确，还有就是这样的写法是否正确？
2.其中 <a href="mailto:nand@1,0">nand@1,0</a> 子节点这样写是否正确？说明文档 ti-gpmc.txt 中有这样描述 #address-cells: Must be set to 2 to allow memory address translation 此处中address必须为2，那么片选为csn1的nand地址应该是1，0还是0，1呢？
3.<span style="color: rgb(255, 0, 0);">reg = <1 0 0>; /* CS1, offset 0 */ 这个reg是否正确？能否解释下这个offset？？
4.<span style="color: rgb(255, 0, 0);">partition@0 { label = "NAND.file-system"; reg = <0x00000000 0x10000000>; }; </span> 这样分区行不行?
注：突然发现问题有点多，好像还有点弱弱的感觉。。。实在是汗。。。各位看着回复一点两点的就好，谢谢了。另外板子还没到，所以还没试。
