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am1808 edma problem

Other Parts Discussed in Thread: AM1808

hi:

when i insmod the edma_test.ko(compiled form sdk_1_10_00_01/Davinci_PSP_SDK_03.20.00.12/src/examples/examples-03.20.22.12/edma/edma_test.c,it's a memory to memory copy test) on my am1808 platform,the  transmission nerver complete,but always got a output like this:

 <callback1>:

From Callback1:DMA_CC_ERROR occured on channnel 0

From the dma driver debug info,when edma test started,the event miss interrupt happed one after another,but I don't know why ?

Any one can help me?