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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


Strange error debugging serial output on custom board

Hello SpecedCowboy,
thanks for the hint. I have syscalls.c in the Src folder from the beginning of the project. Strange why you had it in the Utilities.
I am using semihosting now. According to many helpful internet pages or forums I am sending a few variable values (debug info) to the console in the IDE (using printf()).
It was recommended to click on the syscalls.c (in the tree) and do Exclude from the build. It is possible to inslude it in the Properties of the file in the IDE.
This I write only because it relates with this topic and might help to someone.

vt23