Linux: am335x-evm-linux-sdk-arago-src-03.03.00.04（linux Kernel 4.4.41）

Yordan,

Yordan，
Thank you for your reply.

I looked at it and didn't understand how to calculate the device's access address. hypothesis

How does a device access the address of a device under the GPMC bus

00H-07H is the register of device 0, 10H-17H is device 1, 18H-1FH is device 2, 20H-27H is device 2.

The ALE signal controls how to calculate the device address under the data bus latch address.

Please help with the analysis.

        gpmc: gpmc@50000000 {
            compatible = "ti,am3352-gpmc";
            ti,hwmods = "gpmc";
            ti,no-idle-on-init;
            reg = <0x50000000 0x2000>;
            interrupts = <100>;
            dmas = <&edma 52 0>;
            dma-names = "rxtx";
            gpmc,num-cs = <7>;
            gpmc,num-waitpins = <2>;
            #address-cells = <2>;
            #size-cells = <1>;
            interrupt-controller;
            #interrupt-cells = <2>;
            gpio-controller;
            #gpio-cells = <2>;

    pinctrl-names = "default", "sleep";

    ranges = <0 0 0x08000000 0x1000000>,/* CS0: 16MB for NAND */
     <1 0 0x09000000 0x01000000>;/* CS1:  for duart */        
    duart@1,0 {
    compatible = "mrvl,mmp-uart";
    reg = <1 ? 8>;/* CS1, offset 0, IO size 8 */
    interrupt-parent = <&gpio?>;
    interrupts = <? 8>;  /* gpio103 */
        };
    };
Regards,
Guanyun