FEC_IEVENT
FEC_WRITE(sc, FEC_IEVENT, 0xffffffff); /* clear events */
if (FEC_READ(sc, FEC_IEVENT) & FEC_INT_MII) {
FEC_WRITE(sc, FEC_IEVENT, FEC_INT_MII);
FEC_WRITE(sc, FEC_IEVENT, FEC_INT_MII);
FEC_WRITE(sc, FEC_IEVENT, FEC_INT_MII);
ievent = FEC_READ(sc, FEC_IEVENT);
FEC_WRITE(sc, FEC_IEVENT, ievent); /* acknowledge */