LSR
tmp = INP(LSR);
while ((INP(LSR) & LSR_THRE) == 0)
lsr = UART_READ(LSR);
lsr = UART_READ(LSR);
lsr = UART_READ(LSR);
lsr = CSR_READ(sc, LSR);
lsr = CSR_READ(sc, LSR);
lsr = CSR_READ(sc, LSR);
lsr = CSR_READ(sc, LSR);
lsr = UART_READ(uart1base, LSR);
lsr = UART_READ(uart1base, LSR);
return (UART_READ(uart1base, LSR) & LSR_DRDY) != 0;
lsr = UART_READ(uart2base, LSR);
return (UART_READ(uart2base, LSR) & LSR_DRDY) != 0;