GDT_EDOOR_EN
bus_space_write_1(dpmemt, dpmemh, GDT_EDOOR_EN,
bus_space_read_1(dpmemt, dpmemh, GDT_EDOOR_EN) | 4);
bus_space_write_1(sc->sc_dpmemt, sc->sc_dpmemh, GDT_EDOOR_EN,
GDT_EDOOR_EN) & ~4);