RTEMS | bsps/stm32h7: make errata configurable (!184)

[Sebastian Huber (@sebhub)]

Sebastian Huber commented on a discussion on spec/build/bsps/arm/stm32h7/errata.yml: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/184#note_111638

 > +SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
 > +build-type: script
 > +copyrights:
 > +- Copyright (C) 2024 Karel Gardas
 > +do-build: null
 > +do-configure: |

I worked with other systems in the past where the memory controller had issues with misaligned access. The solution was to access the external memory through a properly configured cache and to make sure that DMA controllers don't use misaligned access. This worked quite well.

Forcing the compiler to not use misaligned access is a bit difficult since you also have to catch handwritten assembly files (memset(), memcpy(), etc.). Also you may have performance issues with packed structures (network stack).

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/184#note_111638
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