RTEMS | bsp/stm32f4: compute flash latency based on system clock (!1204)

[Mohamed Ayman (@mohamedayman23)]

Mohamed Ayman created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1204

Project:Branches: mohamedayman23/rtems:resolve-stm32f4-bspstart-TODO to rtems/rtos/rtems:main
Author:   Mohamed Ayman



## bsp/stm32f4: compute flash latency based on system clock

Replace the hardcoded flash latency configuration with a calculation based on the system clock frequency.

The previous implementation always configured the flash latency to 5 wait states, which is only optimal for the highest supported clock frequencies. Lower system clock configurations could operate with fewer wait states, improving performance.

Introduce a helper function to determine the minimum required flash latency according to the STM32F4 reference manual and apply it during clock initialization before enabling the PLL.

This ensures correct and more efficient flash access timing across different system clock configurations.

![Screenshot from 2026-04-16 12-37-40.png](/uploads/4b2484f1e3ecb0276a682efe2825c934/Screenshot_from_2026-04-16_12-37-40.png){width=553 height=600}

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1204
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