BMCR_FULLDPLX
mii_ctl |= (sdc->mii_if.full_duplex) ? BMCR_FULLDPLX : 0;
printf("%s duplex.\n", (mii_ctl & BMCR_FULLDPLX) ?
BMCR_FULLDPLX | TG3_BMCR_SPEED1000);
ctl &= ~(BMCR_FULLDPLX | BMCR_ANENABLE);
ctl |= BMCR_FULLDPLX;