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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


Semihosting causes crash when not running in the debugger...

I’m using an STM32L476 and configured my project for semihosting, with a call to initialise_monitor_handles() and a simple printf statement. When I Debug the program runs just fine, but when I Run the whole program doesn’t seem to do anything. I can comment out the initialise_monitor_handles() and printf and the program works just fine.

I don’t care about seeing any output when not running in the debugger, but I want the program to at least work. Is there a way to detect at runtime that I’m running in the debugger so I can skip those lines or are they supposed to work when running outside the debugger, but I have something missing? There is only one run configuration for both debug and run.

Tunisia

Hi Charles,

It is quite normal that your program that uses semihostion cannot run without attached debugger.

ARM wrote:

What is semihosting?
Semihosting is a mechanism that enables code running on an ARM target to communicate and use the Input/Output facilities on a host computer that is running a debugger.


In fact, the _write routine of rdimon library generate software BKPT instructions handled by the debug agent (here openocd) .

Generally when we need to use semihosting for debugging and we need to have a release version for standalone running purpose we manage to create two different configrations :

  1. Release Configuration : in which we link against nosys.specs or you add syscalls.c
  2. Debug Configuration : in which we link against rdimon.specs, and we add a symbole (define) named DEBUG


In your source code initialise_monitor_handles() should appear within #ifdef DEBUG .... #endif


Regards,
Tarek