MoreThanIP Dev Board with lwIP

I am using the Altera dev board 1s40 (NiosII on a Stratix) and also have the Giga-bit interface from MoreThanIP. The drivers supplied with the MAC are for the PLUGS Ethernet library. Are there any drivers I can use with the lwIP, or do I need to try and create my own? Any help would be welcome. http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/sad.gif