[seL4] Network lwip for imx6

Hi, I am a student fron Nanjing university, a fresh man of microkernel, specially, know very little about the seL4. Recently I accept a chellange about porting the lwip to sel4, on arch of imx6, does any one could give me a clue? I found the source of camkes does have this code, could I do something to port, to make the lwip work? What my aim is make a tcp echo server. Thank you for all of you help. Best regards from Xuguo Wang