Santosh Bala created a merge request: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/901

Project:Branches: santosh.py/rtems:stm32f4_variants to rtems/rtos/rtems:main
Author:   Santosh Bala




## Summary
Adds an STM32F4 BSP variant (`arm/stm32f446ze`) with a variant linker script 
reflecting the available flash and RAM.

Also extends the STM32F4 BSP to select linker scripts per variant via option 
defaults (`STM32F4_LINKCMDS`), patterned after the H7 BSP. By default, 
`[arm/stm32f4]` uses the generic linker script while `[arm/stm32f446ze]` 
automatically selects `linkcmds.stm32f446ze`. The linker script can also be 
overridden via `STM32F4_LINKCMDS` in `config.ini`. This allows the user to 
specify their own linker files and should make it simpler to add more stm32f4 
variants going forward.

This has been tested on a Nucleo-F446ZE.

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https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/901
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