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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Slow build

I have encountered a similar issue, but it happened to me with SW4STM32 v1.

It has been a while since I looked into the issue and found a solution online for it - it has something to do with the build logs that Eclipse maintains - when they get too big, build speed drops dramatically. The fix involved something like turning build logging off, along with deleting the log file. I wish I could remember the details of just what settings you had to change and which file(s) to delete. I read about how to do it on some (other) forum like Stack Overflow when I was researching the problem over a year ago. It’s more of an Eclipse bug or shortcoming, it’s not something (I think) that is unique to the Ac6’s SW4STM32 plugins.

An alternative to this fix that I discovered on my own is to change the project properties to use the “internal” builder. Do this opening a project’s properties dialog (select project root in Project Explorer pane and hit Alt-Enter), select “C/C++ Build” from the lefthand list, then select “Internal builder” from the /Builder type/ dropdown in the right dialog. Doing this will speed up the build considerably (even if you’re not experiencing the several-seconds-per-file build speed slowdown), and will produce considerably less clutter in the build console output for each source file processed.