P_MII_100MBIT_M
data8 &= ~P_MII_100MBIT_M;
data8 |= FIELD_PREP(P_MII_100MBIT_M, bitval[P_MII_100MBIT]);
data8 |= FIELD_PREP(P_MII_100MBIT_M, bitval[P_MII_10MBIT]);