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CSL and message passing

A newbie's question.

In the C6455_CSL_API reference document, why there is nothing about SRIO for message passing?

As another apporach in SRIO, DirectIO has been talked a lot in this document.

Can any body give me some hint for this question?

From other resource, I found that message passing has been closely linked with MSGQ, which is embeded in the DSP/BIOS. If I want to connect a FPGA module(with SRIO core IP)  with a C6455 DSP, which SRIO method is preferable?

Thanks a lot!