XLCOM_CNTL
WCASE(DCR_XLCOM_BASE, XLCOM_CNTL);
RCASE(DCR_XLCOM_BASE, XLCOM_CNTL);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, XLCOM_CNTL,
bus_space_write_4(sc->sc_iot, sc->sc_ioh, XLCOM_CNTL,
bus_space_write_4(iot, ioh, XLCOM_CNTL, CNTL_RX_CLEAR | CNTL_TX_CLEAR);