MII_PHY_SCR
pscr = mii_read (dev, phy_addr, MII_PHY_SCR);
mii_write (dev, phy_addr, MII_PHY_SCR, pscr);
pscr = mii_read (dev, phy_addr, MII_PHY_SCR);
mii_write (dev, phy_addr, MII_PHY_SCR, pscr);