be_tcvr_write_bit
be_tcvr_write_bit(sc, phy, (data & i) != 0);
be_tcvr_write_bit(sc, phy, 1);
be_tcvr_write_bit(sc, phy, 0);
be_tcvr_write_bit(sc, phy, (val >> i) & 1);
static void be_tcvr_write_bit(struct be_softc *, int, int);