  dev->dev_addr[0] = (mac0 >> 0) & 0xff;  dev->dev_addr[0] = mac0 & 0xff;  dev->dev_addr[0] = (mac0 >> 00) & 0xff;  dev->dev_addr[0] = (mac0 >> 00) & 0xff;  dev->dev_addr[0] = (mac0 >> 0) & 0xff;  dev->dev_addr[0] = mac0 & 0xff;  