lwIP for LM3Sxxxx_Keil_IAR demo

Hi, I want to use lwIP stack for my project. I wonder if lwIP stack can replace uIP stack in LM3Sxxxx_Keil_IAR demo project for any FreeRTOS released. I want to try it , but I am afraid of some port files may be missed. If someone know how to or have already done this work, could you please provide information or share with me? Thanks,
Bill