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

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printf through uart


The three setvbuf calls you mention are meant to set all standard streams as unbuffered; however:

  1. the setvbuf call on stdin is really useless, as stdin is a readonly stream.
  2. the default setup for stderr is already unbuffered, so this call is usualy also useless
  3. so only the stdout call will change anything, as, by default, stdout is line buffered
    • by default printf only send characters on the serial line when it reach an end-of-line character (“\n”)
    • including “setvbuf(stdout, NULL, _IONBF, 0);” in your init routine will effectively get characters out as soon as possible