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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


Linker Problem: undefined reference to `__errno'

Here are the following steps I used :
• Download the STM32Cube_FW_F4_V1.13.0 Firware Package;
• Target the STemWin_SampleDemo application in ...\STM32Cube_FW_F4_V1.13.0\Projects\STM32F429I-Discovery\Applications\STemWin\ folder;

Then :
• Launch SW4STM32 and select the workspace = ......\STM32Cube_FW_F4_V1.13.0\Projects\STM32F429I-Discovery\Applications\STemWin\STemWin_SampleDemo\SW4STM32;
• Right-click in the project explorer >> Import >> General >> Existing Projects into Workspace >> Browse >> Select STM32F429I_DISCO_MB1075 folder >> Finish;
• Launch compilation (no need to add extra settings) : Build finished successfully without error;