BMCR_FDX
PHY_WRITE(sc, MII_BMCR, BMCR_S100|BMCR_AUTOEN|BMCR_FDX);
bmcr |= BMCR_FDX;
PHY_WRITE(sc, MII_BMCR, BMCR_S100|BMCR_STARTNEG|BMCR_FDX);
{ BMCR_S100|BMCR_FDX, ANAR_CSMA|ANAR_TX_FD,
{ BMCR_S1000|BMCR_FDX, ANAR_CSMA,
{ BMCR_S10|BMCR_FDX, ANAR_CSMA|ANAR_10_FD,