使用文档 设备树修改 新增一个 LED 节点 arch/arm/boot/dts/arm/vexpress-v2p-ca9.dts my_pl_led {compatible = "arm, cortex-a9-led";status = "okay";}; 设备树编译 make dtbs 日志 DTC arch/arm/boot/dts/arm/vexpress