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TMS570LS1227: lwIP library: RMII/MII question

Part Number: TMS570LS1227
Other Parts Discussed in Thread: HALCOGEN,

hi, TI expert

 I try to connect to ethernet using TMS570LS1227 and lwip demo.The technical document I mainly refer to is "HALCoGen Ethernet Driver With lwIP Integration Demo and Active Webserver Demo". When I use MII,everything is fine,i can ping PC or start a udp communication. But when i use RMII, ping test or udp test is always failing. I have completed the hardware modification to use RMII. Please tell me where is my setup wrong, any help with this would be appreciated.

Although the ping test fails, the function LwIPInit() returns success.The information printed by the serial port is as follows

Regards,

Hao Liang