SIOP_STEST3
bus_space_write_1(sc->sc_rt, sc->sc_rh, SIOP_STEST3, STEST3_TE);
stest3 = bus_space_read_1(sc->sc_rt, sc->sc_rh, SIOP_STEST3);
bus_space_write_1(sc->sc_rt, sc->sc_rh, SIOP_STEST3,
bus_space_write_1(sc->sc_rt, sc->sc_rh, SIOP_STEST3, stest3);