在UART模式中,接口使用2线或者含有引脚( )、可选RTS和CTS的4线。A.TXDB.TXC.RXDD.RX
RTS is available on GPIO17. For UART 0 (I guess ttyS0) you will have to place those GPIO in mode ALT3. For UART 1 you will have to place those GPIO in mode ALT5. See page 102 of BCM2835 ARM Peripherals. I don't know if the kernel driver will then aut...