MII_WR4
MII_WR4(sc, reg+0, cmd & 0xff);
MII_WR4(sc, reg+4, (cmd >> 8) & 0xff);
MII_WR4(sc, reg+8, (cmd >> 16) & 0xff);
MII_WR4(sc, reg+12, (cmd >> 24) & 0xff);