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SW4STM32 and SW4Linux fully supports the STM32MP1 asymmetric multicore Cortex/A7+M4 MPUs

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world. And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4.
You can get more information from the ac6-tools website and download (registration required) various documents highlighting:

System Workbench for STM32


Unable to single-step application code

As an exercise I un-installed System Workbench and the ST-LINK drivers. I then re-installed it and re-imported the original CubeMX project. I then rebuilt it and created a build configuration. I was able to start the debugger and single-step the code as expected. However, when I exited System Workbench and restarted it again I was again no longer to single-step.

Any ideas?