I am curious though, is the above notion of having hardware require signed
firmware an implication brought down by UEFI? If so do you have any pointers
to where this is stipulated? Or is it just a best practice we assume some
manufacturers are implementing?

It's a mix of best practice and meeting the so called 'secure boot'
requirements. In the non Linux space exactly the same problems exist in
terms of trusting devices and firmware, building a root of trust and even
more so when producing 'hardened' platforms.

Some stuff isn't - USB devices for example don't get to pee on random
memory so often isn't signed.

Alan
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