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Associate III
Apr 28, 2026 12:57 PM UTC
Question

STM32MP257 Developer/Engineering mode

Hello,

I was checking if it is possible to test my M33 NS code I generated using CubeMX would work in Developer Mode. However, the information found on internet suggest it being difficult as it requires the clock to be configured by M33 and also needs RIF accesses making it difficult. 

Without proper documentation on use case and how to use developer mode, it becomes challenging to work on a project within a stipulated time. So please, I would request for the help and Information to test and debug the code in Developer mode. Thanks for the support.

With regards
Amit

1 reply

Kevin HUBER
ST Employee
Oct 21, 2026 2:32 PM UTC

Hello ​@Amit_RS ,

Sorry for the long delay to reply.
We currently doesn’t support/explain the Engineering mode for STM32MP257 because as you said this is not something easy to do.
Only the production mode is supported as visible here: https://wiki.st.com/stm32mpu/wiki/Getting_started/STM32MP2_boards/STM32MP257x-EV1/Develop_on_Arm%C2%AE_Cortex%C2%AE-M33/Modify,_rebuild_and_reload_the_firmware_for_A35-TD_flavor

BR,
Kevin

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