RTEMS | arm/stm32f4: fix SYSCFG register layout (!1140)

Mon Mar 16 15:15:27 UTC 2026

Mohamed Ayman created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1140

Project:Branches: mohamedayman23/rtems:fix-SYSCFG-register-layout to rtems/rtos/rtems:main
Author:   Mohamed Ayman

## Summary

arm/stm32f4: fix SYSCFG register layout

The SYSCFG register block misses two reserved registers between EXTICR4 and CMPCR. This causes CMPCR to be mapped at the wrong offset (0x18 instead of 0x20). Add the missing reserved fields to preserve the correct hardware register layout according to the STM32F4 reference manual.

![Screenshot from 2026-03-16 17-15-00.png](/uploads/09bb8c7709860a55773c2846e0444035/Screenshot_from_2026-03-16_17-15-00.png){width=812 height=600}

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1140
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