UART_TXDATA
if (!ISSET(HREAD4(sc, UART_TXDATA), UART_TXDATA_FULL) &&
stat = HREAD4(sc, UART_TXDATA);
HWRITE4(sc, UART_TXDATA, getc(&tp->t_outq));
stat = HREAD4(sc, UART_TXDATA);
while (bus_space_read_4(sfuartconsiot, sfuartconsioh, UART_TXDATA) &
bus_space_write_4(sfuartconsiot, sfuartconsioh, UART_TXDATA, c);