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TDA4VM: vxProcessGraph() stucks running in mcu2_1

Part Number: TDA4VM

The following demo load picture from sd card and show the picture on display. I run the demo in A72, it works well. 

But if I transplant and runs it in mcu2_1, the program always stucks in vxProcessGraph. I add some logs in the function vxProcessGraph(), and find the programs stops at the following code.

status = tivxEventWait(graph->all_graph_completed_event, graph->timeout_val);

please helo to analysis the problem. The demo code is as following:

vx_image input_img = 0;
char input_file_name[APP_MAX_FILE_PATH];
snprintf(input_file_name,APP_MAX_FILE_PATH, "/opt/vision_apps/test_data/psdkra/tidl_demo_images/0000000103.yuv");
input_img = vxCreateImage(obj->context, 1280, 720, VX_DF_IMAGE_U8);
status = app_load_vximage_from_file(input_img, input_file_name, APP_FILE_FORMAT_YUV);

 if(status == VX_SUCCESS)
 {
        status = app_init_display2( obj->context, &obj->displayObj , "display2Obj");
 }

 if(status == VX_SUCCESS)
 {
          status = app_create_graph_display2(obj->graph,
                                              &obj->displayObj,
                                              input_img);

  }

  if(status == VX_SUCCESS)
  {
        status = vxVerifyGraph(obj->graph);
  }

 if(status == VX_SUCCESS)
 {
       status = vxProcessGraph(obj->graph);
 }