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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


Can't use HW reset mode to connect to Disco board using external ST-LINK v2

Hi,

I don’t think it is a good idea to let the F4 disco powered and try to connect with an ext STLink on the F4.
Maybe the reset line is still connected as you said.

You should be able to debug your custom board with the ext STlink V2.
On the 20 pins header of stlink V2, you must connect:
- The 2 SWD lines (7 for SWDIO and 9 for SWDCLK)
- GND lines (at least one of pin 8, 10, 14, 18 or 20 or all of them)
- VDD appli of your custom board on pin 1
- STlink RST on pin 15

Rgds,
Laurent