FMBM_TCFG
bus_write_4(sc->sc_mem, FMBM_TCFG, 0);
reg = bus_read_4(sc->sc_mem, FMBM_TCFG);
bus_write_4(sc->sc_mem, FMBM_TCFG, reg & ~BMI_PORT_CFG_EN);
reg = bus_read_4(sc->sc_mem, FMBM_TCFG);
bus_write_4(sc->sc_mem, FMBM_TCFG, reg | BMI_PORT_CFG_EN);