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

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Getting started on OSX?

Try to restart Eclipse, then go in File => New => Project… and select a C/C++ => C Project. (http://www.openstm32.org/Creating+a+new+project)
If you cannot find “Ac6 STM32 MCU Project” under the Project type“Executable”, it means the plugins installation has failed.

I just downloaded the lastest version of Eclipse C/C++ then follow installation steps and it works for me. Maybe you should re-install it from scratch.