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

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Hi Kevin,
Yes, System Workbench for STM32 is able to debug all ST boards and chips(if you don’t find it, just do an update by “Help >> Check for updates...”); there is a lot of work invested in keeping up-to-date with chip and board releases...
Regarding import from mbed, it is still a bit complex (you should look at Importing an mbed program for more explanation) but it should become simpler soon as the export of System Workbench project by mbed is in the works...
Bernard (Ac6)