Laser Your Way into Debug Mode on the RP2350

The RP2350 is actually a pretty secure chip, all things considered. It has secure boot, ARMv8’s TrustZone to split secure and non-secure execution, and you can permanently disable debug — the Pi Foundation even included glitch detection, meaning the traditional ‘zap the chip until it obeys’ technique is blocked. That’s why the [Ledger Donjon] security team went full Bond Villain and strapped everyone’s favourite fruit-flavoured microcontroller to a table with a slowly-approaching laser beam.