IER_EUART
bus_space_write_1(bt, bh, com_ier, IER_EUART);
bus_space_write_1(bt, bh, com_ier, IER_EUART);
sc->sc_ier |= IER_EUART;
sc->sc_ier |= IER_EUART | IER_ERXTOUT;
CSR_WRITE_1(regsp, COM_REG_IER, IER_EUART);
CSR_WRITE_1(regsp, COM_REG_IER, IER_EUART);
sc->sc_ier |= IER_EUART | IER_ERXTOUT;
sc->sc_ier = IER_EUART;
sc->sc_ier = IER_EUART;