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RP2350: need cache flush in microcontroller.nvm #9783

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merged 1 commit into from
Nov 2, 2024

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@dhalbert dhalbert commented Nov 1, 2024

The lower-level flash-write code in supervisor/internal_flash.c does cache flushing when PSRAM is in use. Some of that code is duplicated in microcontroller.nvm, but it didn't have the cache flushing.

  • Make a simple API to wrap around low-level flash writes.
  • Call it from the nvm code, and use it in internal_flash.c.
  • Update to a safer cache-flushing scheme, as mentioned in Update RP2350 cache flushing #9770.

Also see:
https://forums.raspberrypi.com/viewtopic.php?t=378249

There may later be pico-sdk support for some of this:
raspberrypi/pico-sdk#1983
raspberrypi/pico-sdk#2005

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@jepler jepler left a comment

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makes sense as a potential bug source.

@dhalbert dhalbert merged commit 24a8927 into adafruit:main Nov 2, 2024
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@dhalbert dhalbert deleted the rp2350-nvm-write-flush-cache branch November 2, 2024 17:00
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Successfully merging this pull request may close these issues.

Writing to the NVM on the RP2350 crashes to Safe Mode, CP-9.2.0 Update RP2350 cache flushing
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