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

Unable to debug on custom STM32 board



On your custom board, do you connect the reset line to the debug probe? By default OpenOCD expect to be able to connect to the board when it is in reset mode, using the reset line to place the MCU in reset state.

Please could you check that?

Please also try to start the debug session by adding option “-d” to the script other options and send what was displayed on the OpenOCD console?

Bernard (Ac6)