GEM_RX_CONFIG
bus_space_read_4(sc->sc_bustag, sc->sc_h1, GEM_RX_CONFIG),
bus_space_write_4(t, h, GEM_RX_CONFIG, 0);
bus_space_barrier(t, h, GEM_RX_CONFIG, 4, BUS_SPACE_BARRIER_WRITE);
if (!gem_bitwait(sc, h, GEM_RX_CONFIG, 1, 0))
bus_space_write_4(t, h, GEM_RX_CONFIG,