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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


Breakpoint at the wrong line

Something is wrong with the previous answers.

The optimization option (-O) has a number (0-3). As the number increases, the optimization that the compiler does increases.

When debugging, you want to turn the optimization off (-O0).

When you release your code you want to test and release with higher levels of optimization (-O3).

If your toolchain is set with debug set to 3 and release set to 0, that’s just wrong.

Andrei