They have a "secondary processor exception" that requires nonfree firmware to be hidden and immutable, leading to nonsense like this:https://puri.sm/posts/librem5-solving-the-first-fsf-ryf-hurdle/ …
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If the firmware is instrospectable (like, say, by living on the filesystem and not physically having secret flash memories for it to hide in) that's a pretty good start.
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RYF says the main CPU cannot be loading the firmware. In most cases that implies the firmware is also not readable by it, because it has to be stored in out-of-band read-only memory and loaded by some external mechanism.
End of conversation
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