给一份rk3288-evb-android-act8846-edp.dtssd卡启动的修改

以下是一份针对RK3288-EVB-Android SDK的DTS文件修改示例，可以实现SD卡启动：

/dts-v1/;
/plugin/;

/ {
    model = "Rockchip RK3288-EVB board";
    compatible = "rockchip,rk3288-evb";

    memory@60000000 {
        device_type = "memory";
        reg = <0x60000000 0x40000000>;
    };

    chosen {
        bootargs = "console=ttyS2,115200n8 root=/dev/mmcblk1p2 rw rootwait earlyprintk";
        stdout-path = &uart2;
    };

    uart2: serial@11004000 {
        compatible = "rockchip,rk3288-uart", "snps,dw-apb-uart";
        reg = <0x11004000 0x1000>;
        interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&uart2_clk>;
        clock-names = "uartclk";
        status = "okay";
    };

    sdhci@11014000 {
        compatible = "rockchip,rk3288-dw-mshc";
        reg = <0x11014000 0x1000>;
        interrupts = <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&cru SCLK_SDMMC>, <&cru PCLK_SDMMC>;
        clock-names = "sdmmc", "apb_pclk";
        pinctrl-names = "default";
        pinctrl-0 = <&sdmmc_clk &sdmmc_cmd &sdmmc_bus4 &sdmmc_bus8 &sdmmc_cd_n>;
        status = "okay";

        mmc-slot@0 {
            reg = <0>;
            bus-width = <8>;
            cd-gpios = <&gpio7 3 GPIO_ACTIVE_LOW>;
            non-removable;
            status = "okay";
        };
    };

    &dpu {
        status = "okay";
    };

    &lcdc {
        status = "okay";
    };

    &backlight {
        status = "okay";
    };

    &act8846_reg {
        status = "okay";
    };

    &i2c1 {
        status = "okay";

        act8846: act8846@5b {
            compatible = "active-semi,act8846";
            reg = <0x5b>;
            gpio-controller;
            #gpio-cells = <2>;
            interrupt-parent = <&gpio2>;
            interrupts = <6 IRQ_TYPE_LEVEL_LOW>;
            status = "okay";
        };
    };

    &mmc {
        status = "okay";
    };

    &mmc1 {
        status = "okay";
    };

    &mmc2 {
        status = "okay";
    };

    &mmc3 {
        status = "okay";
    };

    &mmc4 {
        status = "okay";
    };

    &sdmmc_clk {
        rockchip,pins = <RK_GPIO3 8 RK_FUNC_2 &pcfg_pull_none>;
    };

    &sdmmc_cmd {
        rockchip,pins = <RK_GPIO3 9 RK_FUNC_2 &pcfg_pull_none>;
    };

    &sdmmc_bus4 {
        rockchip,pins = <RK_GPIO3 10 RK_FUNC_2 &pcfg_pull_none>;
    };

    &sdmmc_bus8 {
        rockchip,pins = <RK_GPIO3 11 RK_FUNC_2 &pcfg_pull_none>;
    };

    &sdmmc_cd_n {
        rockchip,pins = <RK_GPIO7 3 RK_FUNC_GPIO &pcfg_pull_up>;
    };
};

此外，你还需要在编译内核时加入SD卡启动相关的配置选项。具体方法可以参考RK3288-Android SDK的文档。