WyBox使用shell脚本检测io口是否正常

1、 修改mt7620a.dts文件，把gpio管脚复用全都定义为通用gpio

/dts-v1/;

/include/ "mt7620a.dtsi"

/ {
    compatible = "ralink,mt7620a-eval-board", "ralink,mt7620a-soc";
    model = "Ralink MT7620a + MT7610e evaluation board";

    palmbus@ {
        gpio1: gpio@ {
            status = "okay";
        };
        gpio2: gpio@ {
            status = "okay";
        };
        gpio3: gpio@ {
            status = "okay";
        };

        spi@b00 {
            status = "okay";

            m25p80@ {
                #address-cells = <>;
                #size-cells = <>;
                compatible = "en25q64";
                reg = < >;
                linux,modalias = "m25p80", "en25q64";
                spi-max-frequency = <>;

                partition@ {
                    label = "u-boot";
                    reg = <0x0 0x30000>;
                    read-only;
                };

                partition@ {
                    label = "u-boot-env";
                    reg = <0x30000 0x10000>;
                    read-only;
                };

                factory: partition@ {
                    label = "factory";
                    reg = <0x40000 0x10000>;
                    read-only;
                };

                partition@ {
                    label = "firmware";
                    reg = <0x50000 0x1fb0000>;
                };
            };
        };
    };

    pinctrl {
        state_default: pinctrl0 {
            gpio {
                ralink,group = "i2c", "uartf", "wdt", "pa", "mdio",
                "rgmii1", "pcie","spi refclk","ephy", "nd_sd", "rgmii2","wled";
                ralink,function = "gpio";
            };
        };
    };

    ethernet@ {
        mtd-mac-address = <&factory 0x4>;
        ralink,port-map = "llllw";
    };

    gpio-keys-polled {
        compatible = "gpio-keys";
        #address-cells = <>;
        #size-cells = <>;
        poll-interval = <>;
        s2 {
            label = "S2";
            gpios = <&gpio0  >;
            linux,code = <0x100>;
        };
        s3 {
            label = "S3";
            gpios = <&gpio0  >;
            linux,code = <0x101>;
        };
    };
};

2、 将如下放shell脚本放在/root文件夹下，命名为test，依次执行如下,就可以将gpio0 ~ gpio72都设为输出，输出为低电平。

#!/bin/sh

cd /sys/class/gpio

for i in  `seq `
do
        echo $i >/sys/class/gpio/export
        echo out >./gpio$i/direction
        #echo out >/sys/devices/.palmbus/.gpio/gpio/gpio$i/direction
        echo  >./gpio$i/value
done

root@OpenWrt:~#
root@OpenWrt:~# chmod  test
root@OpenWrt:~# ./test

3、可以得到如下管脚可以正常使用（打钩）：

问题：

1、 其他的可以创建gpio的io不知道为什么，手动敲入命令行没反应，但直接执行脚本命令就有效果。

参考：

http://blog.sina.com.cn/s/blog_9d074aae01012ytf.html