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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


Nucleo-F103RB, incorrect SystemCoreClock value

I think there is small bug in default system_stm32f10x.c implementation. By default SystemCoreClock is set to 72000000, which is incorrect for 64MHz frequency - maximum value when HSI is used. As a result, if you select NUCLEO-F103RB and create default project, you’ll receive HSI configuration with 64MHz clock, but SystemCoreClock will give you 72MHz instead.