LE_TBUFADDR
a = sc->sc_addr + LE_TBUFADDR(sc, bix);
len = lance_put(sc, LE_TBUFADDR(sc, bix), m);
(*sc->sc_copyfrombuf)(sc, &eh, LE_TBUFADDR(sc, no), sizeof(eh));
a = sc->sc_addr + LE_TBUFADDR(sc, bix);
len = lance_put(sc, LE_TBUFADDR(sc, bix), m);
(*sc->sc_copyfrombuf)(sc, &eh, LE_TBUFADDR(sc, no), sizeof(eh));