AM79C930_GCR
u_int8_t gcr = bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_GCR, gcr);
u_int8_t gcr = bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_GCR, gcr);
return bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);