BCM5708S_BMCR_FORCE_2500
bmcr |= BCM5708S_BMCR_FORCE_2500;
bmcr &= ~BCM5708S_BMCR_FORCE_2500;
new_bmcr |= BCM5708S_BMCR_FORCE_2500;
new_bmcr = bmcr & ~BCM5708S_BMCR_FORCE_2500;