ERR_DETECT
v = bus_space_read_4(sc->sc_memt, sc->sc_memh, ERR_DETECT);
bus_space_write_4(sc->sc_memt, sc->sc_memh, ERR_DETECT, v);
v = bus_space_read_4(sc->sc_memt, sc->sc_memh, ERR_DETECT);
bus_space_write_4(sc->sc_memt, sc->sc_memh, ERR_DETECT, v);