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From this open issue #5470 and discussions in the Adafruit discord server, it looks like the builds for the stm32H7 family have been broken for a while.
Based on my tests, it seems the problem is using the ITCM memory -- it generates a hard fault at runtime. Using the default code placement with no ITCM allows CircuitPython to run correctly.
I am still investigating what causes the hard fault -- help would be welcome -- but these changes are a temporary workaround to make the existing stm32H7 builds usable again.