MVPEX_CD
data = bus_space_read_4(sc->sc_iot, sc->sc_ioh, MVPEX_CD);
return bus_space_read_4(sc->sc_iot, sc->sc_ioh, MVPEX_CD);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, MVPEX_CD, data);