EXUART_UTRSTAT
while((bus_space_read_4(exuartconsiot, exuartconsioh, EXUART_UTRSTAT) &
bus_space_write_4(sc->sc_iot, sc->sc_ioh, EXUART_UTRSTAT,
utrstat = bus_space_read_4(iot, ioh, EXUART_UTRSTAT);
bus_space_write_4(iot, ioh, EXUART_UTRSTAT, utrstat);