Reset CM7 Core from CM4 core

[Gökhan]

Hello. I have a STM32H747XI project. This MCU has both CM4 and CM7 cores. I can reset both of them, when I use NVIC_SystemReset() function. How can I reset only CM7 core from CM4 core?

[Gökhan]

Do you  have any suggestion for this?

[mƎALLEm]

Hello,

Resetting cores independently is a little bit tricky. We suggest to perform a full system reset if needed.
If we reset the CPU we need to make sure that there is no ongoing transaction with a slave that could be locked if the master is reset asynchronously to the slave.
For example, if there is an ongoing Cortex M7 access to the Flash memory and you perform a core reset, after reboot there is a risk to not have the access to the Flash due to a stall of the AXI.

 

[Gökhan]

@mƎALLEm Thank you for your answer. If I use watchDogTimers of the cores (to reset corresponding core) instead of using CM4 to reset CM7, will there be a "locking" risk like you mentioned above?