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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


Connect to custom board STM32L053 - STLINK-V2 - SWD

Hello,

Can you tell us the config ?
ST-Link V2 and STM32L476 ?
Did you connect Reset line from ST-link to the L4 target ?

The change has been done to connect to the target under reset so you can reconnect to a device that is in low power mode for example.
The reset config changed is in stm32l4.cfg file.

Are you using SWD mode ?
If not, can you try in SWD.

Rgds,
Laurent