Hi Jie,
Some sanity questions/comments:
- Have you been able to build and run CCS loopback projects as-is (not SYS/BIOS modifications) on Shannon EVM?
If not please check this first: http://processors.wiki.ti.com/index.php/Desktop-linux-sdk_01.00.00_DSP_Rebuild_Guide
- Do you have a JTAG? if so, you can connect it for a better debugging. Please see below E2E thread, please refer to Oct 31 post for some debugging stepts
http://e2e.ti.com/support/embedded/tirtos/f/355/t/294621.aspx
- Additional comment when rebuilding loopback.out try to keep all the tools versions as they are currently in the CCS project (especially XDCtools and PDK versions).
- When you have your baseline working and you are confortable with the debugging process please add your changes on top of it and let us know how it works.
thank you,
Paula