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You are right, anti tampering, and not even that. Air gapping protects you from other threat.

Lattice for example, has strong anti-tampering features.

Then what is the best solution aside from tightly controlling the supply chain?

There isn't one, that's sort of the thing. The invisible hand of downvotes is the only thing indicating that in the thread, and thus only indirectly. We only have two choices, a magical tampering detector that bricks the whole thing (maybe desirable for some applications, if it never false positive'd), or, the vulnerability.

I'm not even sure a tampering detector would help. If this can happen, I'm fairly sure someone would figure out how to do the ocr by appending components externally.

Lots of downvotes for people asking questions out of ignorance.

You are right, it’s virtual impossible. You gotta trust the supplier.

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