[bsder]

> Getting access to architecture details of the TI PRU would necessitate an NDA, would it not?

Nope. All the information is right in the publicly available architecture manuals. However, you don't need to copy the PRUs, per se. All this can be done with RISC-V.

The important parts are deterministic execution, the register file sideload between paired processors, and, possibly, single cycle instruction execution. None of these are precluded by using RISC-V.

And, given how large his PIO stuff is, I'd argue it would be better to do this with RISC-V.