MVPEX_IC
ic = bus_space_read_4(sc->sc_iot, sc->sc_ioh, MVPEX_IC);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, MVPEX_IC,
bus_space_write_4(sc->sc_iot, sc->sc_ioh, MVPEX_IC, 0);