sc_ucr1
SET(sc->sc_ucr1, IMX_UCR1_SNDBRK);
CLR(sc->sc_ucr1, IMX_UCR1_SNDBRK);
bus_space_write_4(iot, ioh, IMX_UCR1, sc->sc_ucr1);
sc->sc_ucr1 &= ~IMXUART_INTRS_UCR1;
ucr1 = sc->sc_ucr1;
if (ucr1 != sc->sc_ucr1 || ucr2 != sc->sc_ucr2) {
sc->sc_ucr1 = ucr1;
ucr1 = sc->sc_ucr1;
if (ucr1 != sc->sc_ucr1) {
sc->sc_ucr1 = ucr1;
sc->sc_ucr1 |= IMX_UCR1_UARTEN;
bus_space_write_4(iot, ioh, IMX_UCR1, sc->sc_ucr1);