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:
In the interests of helping others who may struggle with cryptic errors like this in my case this was caused by my NUCLEO-H745ZI-Q.xml file having become corrupted ... it was no longer an XML file but a binary file consisting mostly of nulls. I replaced it with a good version and CDT is working again as expected.