how about duplex MACID in the start log

I found that there was 2 MACID in the start log,

[    2.931945] Detected MACID=d0:39:72:30:58:cf

[    2.937377] cpsw: Detected MACID = d0:39:72:30:58:d1

what is the difference between 2 MAC　ＩＤ？

Ｉ　ｆｏｕｎｄ　ｃｏｄｅｓ　ｆｏｒ　ｔｈｅ　ｌｏｇｓ，

if (is_valid_ether_addr(data->mac_addr)) {
        memcpy(priv->mac_addr, data->mac_addr, ETH_ALEN);
        printk(KERN_INFO"Detected MACID=%x:%x:%x:%x:%x:%x\n",
            priv->mac_addr[0], priv->mac_addr[1],
            priv->mac_addr[2], priv->mac_addr[3],

            priv->mac_addr[4], priv->mac_addr[5]);

－－－－－－－－－－－－－－－

  if (is_valid_ether_addr(data->slave_data[1].mac_addr)) {
        memcpy(priv_sl2->mac_addr, data->slave_data[1].mac_addr,
            ETH_ALEN);
        pr_info("cpsw: Detected MACID = %pM\n", priv_sl2->mac_addr);
    } else {
        random_ether_addr(priv_sl2->mac_addr);
        pr_info("cpsw: Random MACID = %pM\n", priv_sl2->mac_addr);
    }

Ｗｈｅｒｅ　ｃａｎ　Ｉ　ｍｏｄｉｆｙ　ｔｈｅ　ＭＡＣＩＤ　ｉｆ　ｗｅ　ｎｅｅｄ　ｉｎ　ｍａｎｕｆａｃｔｕｒｅ？