MII_CR_SPEED_100
*phy_ctrl |= MII_CR_SPEED_100;
*phy_ctrl &= ~(MII_CR_SPEED_1000 | MII_CR_SPEED_100);
phy_ctrl &= ~(MII_CR_AUTO_NEG_EN | MII_CR_SPEED_100 | MII_CR_SPEED_10);
MII_CR_SPEED_100);
*phy_ctrl |= MII_CR_SPEED_100;
*phy_ctrl &= ~(MII_CR_SPEED_1000 | MII_CR_SPEED_100);