GMAC_INT2_STATUS
bus_space_write_4(sc->sc_iot, sc->sc_ioh, GMAC_INT2_STATUS, ~0);
bus_space_read_4(sc->sc_iot, sc->sc_ioh, GMAC_INT2_STATUS),
bus_space_read_4(sc->sc_iot, sc->sc_ioh, GMAC_INT2_STATUS),
bus_space_read_4(sc->sc_iot, sc->sc_ioh, GMAC_INT2_STATUS),