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

SW 1.3 - HAL 1.7 - several "could not be resolved" warnings


Yes, adding low level drivers as external libraries will allow to share them between projects in the workspace.

Regarding your errors, these are errors generated by Eclipse due to indexing errors. You should be able to correct these by re-indexing your workspace: On the application and library project you could right click >> Index >> Rebuild


Thank, that solved my problem!