cache coherence problem

hi

I am using DM648 Kit and Psp_driver_example which is sd_compositor.

I have problem with cache cocherence on below code. it does not show any display.

I spent too much time with this. but i still cant solve.

please help me, how to fix cache coherence problem. 

               /* Invalidate the buffer before giving to capture driver */
             

                 BCACHE_inv((Uint8 *)capChInfo[count].frame->frame.frameBufferPtr, (CAP_FRAME_SIZE),TRUE);

                /* Capture buffer will return the latest captured buffer */
                status |= FVID_exchange(capChInfo[count].chanHandle, &(capChInfo[count].frame));

     
      
            ///////////// image processing here /////////////
     
               framepointer = (capChInfo[count].frame->frame.frameBufferPtr);

               for(i = 0; i < 704; i++)
               {
                 for(j = 0; j < 480; j++)
                  {
                      *(framepointer + j * (i + 1) ) = 0x38383838;   // 0x38383838 is example
                 }
               }

          video_compositor(&disChInfo, &capChInfo[0], numCompositorChannel,  DIS_NUMPIXELS,  DIS_NUMLINES,  capNumPixels,  CAP_NUMLINES);             /* inNumLines */

            /* Flush and invalidate the processed buffer so that the EDMA reads
               the processed data */
            

            BCACHE_wbInv((Uint8 *)disChInfo.frame->frame.frameBufferPtr,   DIS_FRAME_SIZE,TRUE);

            status |= FVID_exchange(disChInfo.chanHandle, &(disChInfo.frame));