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

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J-Link support



The right value to use in this case would be “${openstm32_compiler_path}\arm-none-eabi-gdb.exe” (the .exe is in fact optional); going this way allows you to not depend on th einstallation directory and use the last version of the debugger when you update System Workbench (by “Help >> Check for Updates...”)