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RTOS/TMS320C6748: C6748+SYSBIOS+EDMA3+Cache, transport error

Part Number: TMS320C6748
Other Parts Discussed in Thread: SYSBIOS

Tool/software: TI-RTOS

6886.Application.zip

C6748+SYSBIOS+EDMA3+Cache

L2 Cache is 256KB.

In CCS 5.5,MAX_ACOUNT = 10,MAX_BCOUNT = 10, the project Application/EDMA3 runs nomally.

However,  MAX_BCOUNT is modified from 10 to 512.Then run the project, a mistake occurs.

#define MAX_BCOUNT (512u)

before running,  _dstBuff[] is all 0

after running,  _dstBuff[0..9] is 0, the other members of _dstBuff[] is correct.

It  seems that the first 10 bytes are not transported by EDMA3.

What's the reason of the problem?