sc_nulldma
(sc->sc_nulldma >> 16) & 0xffff);
htosonic32(sc, sc->sc_nulldma & 0xffff);
(sc->sc_nulldma >> 16) & 0xffff);
htosonic16(sc, sc->sc_nulldma & 0xffff);
fr->ef_frags[seg].ef_addr = sc->sc_nulldma;