Hello Maksh,
We will need a little bit more information to help you. I supposed that you have read the 2 following articles to do what you want:
https://wiki.st.com/stm32mpu/wiki/STM32MP1_Distribution_Package#Modifying_software_running_on_Arm_Cortex-M
https://wiki.st.com/stm32mpu/wiki/STM32CubeMP1_Package#Distribution_Package_for_STM32CubeMP1
At which step are you exactly blocked in your process ?
Erwan.
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