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 two short videos (registration required) highlighting:

System Workbench for STM32

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Programming fails?

if you useCubeMX set your gpio as output puhs pull or open drain (in the device view for instance) that all what required
Generate code will have all clk and i/o setup and should work straigh away .
of course your blink code must be after all init in the main (in the infinite while loop) our on the default thread if you have enabled rtos on MX