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

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FreeRTOS running, SUCCESS!

to have cdc revceive_fs you must kick of reception , it will then be called in isr by usb stack when data will come from host, You start the rx by calling

uint8_t USBD_CDC_ReceivePacket(USBD_HandleTypeDef *pdev)

note that many hal driver and f/w will fail with freertos mainly because of usage hal_tick for time out or delay.

systick isr priority is