Ah just to be clear, I would like the individual SoC units to have as little firmware as possible, for the security of the computation. An important part of th

Ah just to be clear, I would like the individual SoC units to have as little firmware as possible, for the security of the computation. An important part of the goal is to get an as "closed computational environment" as possible, where risk for BIOS/firmware infection by hacker is minimal. So just CPU, ECC RAM, ethernet, and microSD (or USB) to boot off.