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"Not needing binary blobs" would be a start, wouldn't it?

I don't know, depends on a lot of stuff. If you are interested in this property from a security perspective, then no -- it's trivial to have hardware backdoors without any binary blobs.

This likely would also mean that it can't be flashed, so if you care about future maintainability, this is also a negative -- it can not be updated/fixed in the future, which may or may not make sense depending on what part we are talking about.

But if there are some kind of signature validation then it gets even more complicated (like e.g. iphone screens knowing if they are from apple or not).

> I don't know, depends on a lot of stuff. If you are interested in this property from a security perspective, then no -- it's trivial to have hardware backdoors without any binary blobs.

This is a "necessary but not sufficient" thing.

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