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

Unable to select the target board "Current board target is invalid !"

Same problem on STM32CubeMX version 5.6, the auto-generated code is missing the linker script and the target is not defined.
Resolved by importing the linker script from an example project located in the STM32Cube repository folder and by defining the mcu name inside the auto-generated “project name”.xml file ( the element name that define the mcu is “mcuId”).