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stm32f7, stm32h7: Avoid speculative reads from QSPI

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As recommended in AN4760 the memory region where the QSPI flash can be
memory mapped should be configured to be Strongly ordered memory. This
works around an issue where a speculative read from the CPU may cause
later problems with using the QSPI bus.

This avoids #57466.

Signed-off-by: Ole Morten Haaland <omh@icsys.no>
This commit is contained in:
Ole Morten Haaland 2023-05-02 07:58:56 +02:00 • committed by Carles Cufí
commit 1d8dc008e5
4 changed files with 17 additions and 0 deletions
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dts/bindings/base/zephyr,memory-region.yaml
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@ -25,6 +25,7 @@ properties:
- "FLASH"
- "PPB"
- "IO"
- "EXTMEM"
description: |
Signify that this node should result in a dedicated MPU region. The
region address and size are taken from the <reg> property, while the MPU