SACOM_CR1
bus_space_write_4(iot, *iohp, SACOM_CR1, brd >> 8);
bus_space_write_4(iot, ioh, SACOM_CR1, sc->sc_speed >> 8);
bus_space_write_4(sc->sc_iot, sc->sc_ioh, SACOM_CR1, 0);