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project migrate from ccs3.3 to ccs5.5

Other Parts Discussed in Thread: TMS320C6455

hello , I have a problem for migrating project from ccs3.3 to ccs5.5, the problem described bellow:

DSP : TMS320C6455 x2

CCS5.5 with DSP/BIOS5.42.1.09 and compiler 7.4.4

I have two projects (one is for srio master and the other is for srio slave) which is developed  under ccs3.3, and it is can sucessfully run on my board  from my test, now I want to migrat it from ccs3.3 to ccs5.5,  and I make two new project for the two projects in ccs5.5 , and I step by step add the source files,header files, libraries and make a new DSP/BIOS tconf, after I build sucess, I loaded them all into the DSPs, when I run the program , I found the srio initialization (which is in main function) can't pass, and the CCS5.5will disconnected from board automatically and it can't reconnect the board before I power off the board and, after I tried much times, I found if I comment the board initialization function(which is run before srio initialization), the srio can sucessful initialize and pass, how does this happen, waitting for your help!