Another tactic is to run the check a bunch of times, maybe in parallel. If any of them don't match then assume locked or halt. Getting multiple glitches to each

Another tactic is to run the check a bunch of times, maybe in parallel. If any of them don't match then assume locked or halt. Getting multiple glitches to each hit each check in the same way is very difficult. Literally something like if (read_flash(0xdeadbeef) != 0x1234) { count += 1; } if (read_flash(0xdeadbeef) != 0x1234) { count += 1; } ... but of course, then you have to worry about how `count` is being checked.