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uboot 指令mmc指令=> mmc -helpmmc - MMC sub systemUsage:mmc info - display info of the current MMC devicemmc read addr blk# cntmmc write addr blk# cntmmc erase blk# cntmmc rescanmmc part - lists available partition on current mmc devicemmc dev [d

kernel/drivers/media/rc/

涉及文件：kernel/include/dt-bindings/pinctrl/rockchip.h //引脚pinctrl相关宏定义选择GPIO4_C6引脚，对该IO引脚进行控制。该引脚在OK3399上做edp屏的pwm背光，不过只在选择主或副屏选择edp显示的情况下才做pwm，默认情况下是做GPIO。原理图接口如下：查阅用户资料-原厂资料中的《Rockchip RK3399 TRM V1.4 Part1》文档，检索gpio4c6，查看该引脚的功能复用：可以看到该引脚默认的功能是gp

RK3399 UART特性最高支持4M波特率UART0、3支持硬件自动流控支持中断传输模式和DMA传输模式struct termioskernel/arch/arm64/include/generated/asm/termios.hkernel/include/asm-generic/termios.hkernel/include/uapi/asm-generic/termios.hkernel/include/uapi/asm-generic/termbits.hc_iflag c_

参考文档：https://blog.youkuaiyun.com/dunwin/article/details/90176951SARADCThe ADC is a 6-channel signal-ended 10-bit Successive Approximation Register (SAR) A/DConverter. It uses the supply and ground as it reference which avoid use of any externalreference. I