SL_MII_CMD1
SLN_WRITE_4(sc, SL_MII_CMD1, 0x1 << 6);
SLN_WRITE_4(sc, SL_MII_CMD1, phys[0] << 6);
SLN_WRITE_4(sc, SL_MII_CMD1, phys[0] << 6 | phys[1] << 11);