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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 two short videos (registration required) highlighting:

System Workbench for STM32


Printf via SWV doesn't print anything

Tunisia

>> I have added the syscalls.c(into the source location, where main.c is)...My source configuration is 72MHz (system clock), I have included CMSIS workspace in my directory... Changed the write routine... Still doesn’t work... Code compiles, but doesn’t work...
⇒ You need to solder the ‘Solder Bridge’ SB10 (SWO)

>> I am running a GPIO example, not RTOS. Will this method mentioned by you still work?
⇒ YES

>> In addition, I have couple more question. how adding syscalls.c and changing the _write() function changes the implementaion of printf? how the syscall.c changes the implementation in ?
⇒ Simply because printf send the string characters one by one using the _write routine (avoid using -specs=nosys.specs in linker miscellaneous flags)

>> I really need get printf or ITMSend recieve working as ap. I am using stm32f3 Discovery. How to determine the clock frequency and port number so that we can see in STLInk? Please advice.
⇒ as your cpu frequency is 72MHz, then use 72000000 as System clock and Stimulus port 0