GT_MPP_Control3
r = bus_space_read_4(sc->sc_iot, sc->sc_ioh, GT_MPP_Control3);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, GT_MPP_Control3, r);
for (regoff = GT_MPP_Control0; regoff <= GT_MPP_Control3; regoff += 4) {