this post was submitted on 05 Aug 2026
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Programming

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experiments with isolation on blue pill (bare-metal in C) (l0puh.github.io)
submitted 4 days ago* (last edited 4 days ago) by lopuh@programming.dev to c/programming@programming.dev
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i got an idea to build a semi-hypervisor, or rather, a supervisor, for a cortex-M3 system (i’ve chosen blue pill because it’s cheap and because i have tons of them).

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[–] litchralee@sh.itjust.works 3 points 3 days ago* (last edited 3 days ago)

I skimmed this article, but I'll revisit it later because MPU protections have always intrigued me, in terms of being a much smaller subset of the protections afforded by an MMU. That said, for work projects, I've only ever been able to make use of MPU regions for coarse-grain protection (eg prevent the DMA-dedicated regions from being accessible by everything) and not for per-task protection. So I'm always interested in ways that more isolation can be applied, precisely because it keeps code honest, which isn't a bad thing. It's no different than having software asserts.