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

SW3STM32 Fw_F4_V1.9 CDC-Standalone success but CDT issues

Many thanks for the quick response - you’re right, it cleared itself up after I left it running for some period - I went away and came back 4hours later.

BTW followed the instructions for ST-LINK to SWD to pyboard.org STM32F405 and worked nicely. Will do a post on it tomorrow.