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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


Target doesn't halt when starting a debug

Particularly when changing projects, or after a few days doing a bunch of other things, when I try to start up a debug sessión, it says

Error: Target not halted
Error: failed erasing sectors 0 to 36
Error: flash_erase returned -304
shutdown command invoked

Often unplugging and replugging the ST-Link or “resetting” the USB port it gets oriented.

But sometimes it’s more serious. I recently reset the whole computer and unplugged everything.

Still hangs.

I’ve rechecked the SWD connections, the reset pin is connected as always.

I be sure all modules are stopped.

What’s going on?