MII_TG3_MMD_ADDRESS
err = tg3_writephy(tp, MII_TG3_MMD_ADDRESS, addr);
err = tg3_writephy(tp, MII_TG3_MMD_ADDRESS, val);
err = tg3_writephy(tp, MII_TG3_MMD_ADDRESS, addr);
err = tg3_readphy(tp, MII_TG3_MMD_ADDRESS, val);