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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


You are viewing a reply to re-directing usart to printf  

re-directing usart2 to printf

Thanks Andrei for the help. Unfortunatly no joy.
I’ve attached my code below which is pretty much the same as you suggested, just formated as CUBE likes it.
One thing to note there doesn’t appear to be a syscalls.c file in the project generated by CUBE.