HEATHROW_FCR
fcr = bus_read_4(sc->sc_memr, HEATHROW_FCR);
bus_write_4(sc->sc_memr, HEATHROW_FCR, fcr);
bus_write_4(sc->sc_memr, HEATHROW_FCR, fcr);
bus_write_4(sc->sc_memr, HEATHROW_FCR, fcr);
bus_write_4(sc->sc_memr, HEATHROW_FCR, fcr);