Ethernet Driver Help!

My board use LXT971 chips for PHY.But I can’t ping my board. the mii_reset() and mii_negotitat() routine return success. I think it maybe something wrong in the transformer circuit. But how can I make sure my Lxt971 work well. How can I make sure that the transformer cause the board can’t connect to the ethernet? Is there some doc about the fusion network stack(old version in the netos5.1)porting to the net+os?