menuconfig BSP_USING_UART4
    bool "Enable UART4"
    default y
    if BSP_USING_UART4
        config SERIAL_BUS_NAME_4
            string "serial bus  name"
            default "uart4"
        config SERIAL_DRV_NAME_4
            string "serial bus  driver name"
            default "uart4_drv"
        config SERIAL_4_DEVICE_NAME_4
                string "serial bus  device name"
                default "uart4_dev4"   
    endif