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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


STLINK v2 reset not working, unable to program/debug

UPDATE: DON’T BUY A $2,- ST LINK V2 from aliexpress.

Afther spending a full day trying to make my debugger work (learning some openocd in the progress) I gave upmrgreen
I noticed that the clock speed can’t be 1000KHZ and it switches to 950Khz and thought that’s odd. I began to suspect my $2,00 ST Link V2 wasn’t the best buy. So I took my debugger apart and found out it was based on a STM32F101. My stm32F4 discovery board uses a STM32F103 chip as programmer instead (double the clock speed 36mhz >> 72mhz). So i switched to my discovery board as programmer/debugger it worked without a hitch (no modification needed to the default configuration were needed).