stand alone lwIP

I have developed a PCB with 2 ethernet ports. Both ports are a copy of the hardware from the development PCB. I was able to get the stand alone lwIP web server running on the dev. PCB but it won't run on my PCB. I did change the name of my ethernet modules to lan91c111_0 & lan91c111_1 in SOPC builder. Where can I make to change in the lwIP code to call out my new module names.