COM_UART_16550
sc->sc_uarttype = COM_UART_16550;
sc->sc.sc_uarttype = COM_UART_16550;
sc->sc_uarttype = COM_UART_16550;
sc->sc_uarttype = COM_UART_16550;
case COM_UART_16550:
sc->sc.sc_uarttype = COM_UART_16550;