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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


USB CDC Host demo (FS or HS) STM32F7 Discovery

normaly you need esd proctedtion and serial terminal resistor to get a clean usb connection.
I have done sucessull USB wiring on a nucleo wiht only resistor (see any eval baord schematic for detauls).

I’m not sure to ge the issue but if you’r code and wring is correct pluging the device to some host it shall appear .
On windows it will show as unkown device and if you install ST VCP driver its will appear as a “COM” port

if you plug it to a linux hots it will apear as an usb cdc/ascm tty usable out of the box.