STM32MP157 run, not debug, M4 in engineering mode?

[DCajigal]

For one project we would want to use only de M4 core of the SM32MP157 MPU. We want this because we have no time to learn how to develop the whole application using linux and the whole potential of the MPU, but we would want to have the hardware ready for a future update. We have been trying to use the M4 core in engineering mode, but we have been only able to debug the code. When we unplug the board and replug it the code is not executed. The board that we are using is the STM32MP157A-DK1. Thank you in advance for the help

[Olivier GALLIEN · Accepted solution]

Hi @DCajigal​ ,

This is simply not possible with STM32MP157.

Engineering mode is a specific mode for development/debug purpose.

For normal boot operation, A7 is master and you can't escape to deal with Linux part in order to launch M4 code.

Please refer to our online documentation https://wiki.st.com/stm32mpu/wiki/Category:STM32_MPU_microprocessor_devices

Olivier

[DCajigal]

Thanks for the answer!