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