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ndk application initialize problem

hello, I'm degbugging a program with network on EVM6678, my environment is as follow:

CCS5.5

mcsdk_2_01_02_05

bios_6_35_04_50

I write the program refer to the helloWord demo in Mcsdk, but it is suspended at this step:

[C66xx_0] PASS successfully initialized 
[C66xx_0] Ethernet subsystem successfully initialized 
[C66xx_0] Ethernet eventId : 48 and vectId (Interrupt) : 7 
[C66xx_0] Registration of the EMAC Successful, waiting for link up ..

and I can't find the problem, could someone tell me how to solve this problem.