MII_COMMAND_ACK
ep_mii_sendbits(sc, MII_COMMAND_ACK, 2);
mii_bitbang_sendbits(sc, ops, MII_COMMAND_ACK, 2);
(MII_COMMAND_ACK << 16) | BCE_MIPHY(phy) | BCE_MIREG(reg)); /* MAGIC */
(MII_COMMAND_ACK << 16) | (val & BCE_MICOMM_DATA) | /* MAGIC */