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

Stm32mp1 Ethernet-over-USB connection

Can you try to ping at ? If it is alive, try to connect with ssh. I’m not sure but i suspect the ssh server is not running on the stm32mp157c discovery. Can you also attached screenshot of the debug configuration startup page (Run > Debug Configurations... > ST’s STM32 MPU Debugging > $configuration_name > Startup tab )?