1.1. It must be able to run 100% free software. No closed BIOS. No binary
firmware loaded to any part of the system with meaningful access to my
data. (CPU, GPU, network card, etc.)

Firmwares on latest AMD APUs:

1) NB firmware - most likely needed for PCIe - never tried without
2) SB firmware - IMC - you dont need to load this
3) XHCI - you dont need to  load this - no USB3.0
4) CPU microcode - you will have problems if you don't load this (need to check)
5) ATOM tables - you can interpret them via kernel driver
6) GPU firmware - no GPU and no modesetting

You lose.

Yes you do. But what about IOMMU? You could authorize DMA accesses but not sure if this shields SB stuff.

Also, why the backdoor would be in FW when it could be directly in the HW? You will never know, except if you build your own system on FPGA....

Thanks
Rudolf

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