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numpad0
on Sept 13, 2025
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486Tang – 486 on a credit-card-sized FPGA board
Didn't they have issues with `LOCK CMPXCHG`(not the 8B)? This is out of my depth and I am not sure, but it sounds similar to the f00f bug.
1:
https://en.wikipedia.org/wiki/Intel_Quark#Segfault_bug
neerajsi
on Sept 14, 2025
[–]
Yes, they did have the bug with the lock prefix. IOT people at Microsoft got NT booting on the Quark and we ran into that problem. I wound up writing a small tool to patch out all the lock prefixes.
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1: https://en.wikipedia.org/wiki/Intel_Quark#Segfault_bug