UARTCFIFO_RXFLUSH
writeb(UARTCFIFO_RXFLUSH, sport->port.membase + UARTCFIFO);
writeb(UARTCFIFO_RXFLUSH,
writeb(UARTCFIFO_TXFLUSH | UARTCFIFO_RXFLUSH,
fifo |= UARTCFIFO_TXFLUSH | UARTCFIFO_RXFLUSH;
writeb(UARTCFIFO_TXFLUSH | UARTCFIFO_RXFLUSH,
writeb(UARTCFIFO_RXFLUSH, sport->port.membase + UARTCFIFO);