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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


STemWin Touch Input on STM32F429 (STMPE811)

I started to reply but must not have hit ‘post.’ The confusing code is in the board support package (BSP) for the discovery board and so is the responsibility of ST. I’m away from the computer at the moment so I cannot provide the file name otherwise I could be of more help. The file name is something like stm32f429i_discovery_ts.c IIRC.