RTEMS | Work around STM32 H7 errata unsupported read access with unaligned address (#5110)

[Karel Gardas (@kgardas)]

Karel Gardas created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5110



## Summary

ST in its errata doc for H7 family ([ES0445](https://www.st.com/resource/en/errata_sheet/es0445-stm32h745xig-stm32h755xi-stm32h747xig-stm32h757xi-device-errata-stmicroelectronics.pdf)) in version 3 from 18-Jul-2023 adds errata record:

_Citation:_

### 2.8.4 Unsupported read access with unaligned address
#### Description
Read access with unaligned address, such as a half-word read access starting at odd address, is not supported.
#### Workaround
Compile the software that accesses the fmc region with a compiler option that ensures data alignment, such as –
no_unaligned_access

_Citation ends here._


Clearly the workaround for this errata is missing from RTEMS yet.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5110
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