4.7 PCIE(M.2接口硬盘)调试

4.7.1 硬件原理分析

图1

图2

图3

从原理图我们可以得出以下信息

1、用的是PCIE2.0的接口
2、PCIE2.0的供电使能引脚为GPIO1_A4

4.7.2 DTS配置如下

{
    vdd_pcie3v3: vdd-pcie3v3 {
        pinctrl-names = "default";
        pinctrl-0 = <&pcie2_en>;
        compatible = "regulator-fixed";
        regulator-name = "vdd_pcie3v3";
        regulator-always-on;
        regulator-boot-on;
        enable-active-high;
        gpio = <&gpio1 RK_PA4 GPIO_ACTIVE_HIGH>;
        regulator-min-microvolt = <3300000>;
        regulator-max-microvolt = <3300000>;
        vin-supply = <&vcc3v3_sys>;
    };
};

&pcie2x1 {
    status = "okay";

    pinctrl-names = "default";
    pinctrl-0 = <&pcie2_rst>;//pcie20m1_pins
    reset-gpios = <&gpio3 RK_PC1 GPIO_ACTIVE_HIGH>;
    vpcie3v3-supply = <&vdd_pcie3v3>;
};

&pinctrl {
    pcie2{
        pcie2_rst: pcie2-rst {
            rockchip,pins = <3 RK_PC1 RK_FUNC_GPIO &pcfg_pull_none>;
        };
        pcie2_en: pcie2-en {
            rockchip,pins = <1 RK_PA4 RK_FUNC_GPIO &pcfg_pull_none>;
        };
    };
};

4.7.3 编译后烧写验证

系统启动后我们可以看到识别到U盘，通过df -h命令，可以看到设备节点为dev/fuse, 并且已经自动挂载到/mnt/media_rw/E533-11F5/目录下，识别到容量为233G，说明已经可以正常使用了。

rk3568_aybering:/ # df -h
Filesystem                   Size  Used Avail Use% Mounted on
tmpfs                        1.8G  820K  1.8G   1% /dev
tmpfs                        1.8G     0  1.8G   0% /mnt
/dev/block/mmcblk2p11         11M  144K   11M   2% /metadata
/dev/block/dm-0              934M  931M  2.8M 100% /
/dev/block/dm-2              296M  296M  924K 100% /vendor
/dev/block/dm-4              588K  584K  4.0K 100% /odm
/dev/block/dm-3              204M  203M  636K 100% /product
/dev/block/dm-1              118M  118M  380K 100% /system_ext
tmpfs                        1.8G     0  1.8G   0% /apex
tmpfs                        1.8G  264K  1.8G   1% /linkerconfig
/dev/block/mmcblk2p10        356M  124K  356M   1% /cache
/dev/block/dm-5               10G   55M   10G   1% /data
tmpfs                        1.8G     0  1.8G   0% /data_mirror
/dev/fuse                     10G   55M   10G   1% /mnt/user/0/emulated
/dev/block/vold/public:259,1 233G  608K  233G   1% /mnt/media_rw/E533-11F5
/dev/fuse                    233G  608K  233G   1% /mnt/user/0/E533-11F5
rk3568_aybering:/ #