可以根据实例说明，比如说瑞芯微的样本dts是rk3288-evb-android-act8846-edp.dts

以下是一个可以用于SD卡启动的rk3288-evb-android-act8846-ed.dts示例，仅供参考： ``` /dts-v1/; /include/ "rk3288.dtsi" / { model = "Rockchip RK3288 EVB with act8846 and edp"; chosen { bootargs = "earlyprintk console=ttyS2,115200n8 root=/dev/mmcblk1p2 rw rootwait"; }; memory@60000000 { reg = <0x60000000 0x40000000>; }; reserved-memory { #address-cells = <1>; #size-cells = <1>; ranges; kernel@0 { reg = <0x60000000 0x02000000>; }; reserved@20000000 { reg = <0x20000000 0x20000000>; }; }; aliases { mmc0 = &sdmmc; }; sdmmc: sdmmc@fe310000 { compatible = "rockchip,rk3288-dw-mshc"; reg = <0xfe310000 0x1000>; interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>; clocks = <&cru PCLK_SDMMC0>, <&cru SCLK_SDMMC0>; clock-names = "pclk", "hclk"; dmas = <&pdma 12>, <&pdma 12>; dma-names = "rx", "tx"; pinctrl-0 = <&sdmmc_pins>; pinctrl-names = "default"; status = "okay"; }; sdmmc_pins: sdmmc@0 { rockchip,pins = < RK_GPIO1 1 RK_FUNC_2 RK_GPIO1 2 RK_FUNC_2 RK_GPIO1 3 RK_FUNC_2 RK_GPIO1 4 RK_FUNC_2 RK_GPIO1 5 RK_FUNC_2 RK_GPIO1 6 RK_FUNC_2 RK_GPIO1 7 RK_FUNC_2 RK_GPIO1 8 RK_FUNC_2 >; }; act8846: act8846@5b { compatible = "active-semi,act8846"; reg = <0x5b>; gpio-controller; #gpio-cells = <2>; interrupt-parent = <&gpio1>; interrupts = <14 IRQ_TYPE_EDGE_RISING>; pinctrl-names = "default"; pinctrl-0 = <&act8846_pins>; status = "okay"; }; act8846_pins: act8846@0 { rockchip,pins = < RK_GPIO4 3 RK_FUNC_GPIO RK_GPIO4 4 RK_FUNC_GPIO RK_GPIO4 5 RK_FUNC_GPIO >; }; edp: edp@1c19000 { compatible = "rockchip,rk3288-edp"; reg = <0x01c19000 0x1000>; interrupts = <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>; clocks = <&cru SCLK_EDP>; clock-names = "edp"; status = "okay"; }; backlight: backlight { compatible = "pwm-backlight"; pwms = <&pwm2 0 5000>; brightness-levels = <0 14 28 42 56 70 84 100>; default-brightness-level = <7>; status = "okay"; }; }; ``` 这个示例中，sdmmc节点表示SD卡，act8846节点表示PMIC，edp节点表示eDP显示器接口，backlight节点表示背光控制。其中，bootargs设置了SD卡启动的相关参数。注意，这个示例是根据某个特定的rk3288 EVB开发板进行配置的，如果你的硬件不同，需要进行相应的修改。

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。