Start Up error
-> Mithil
You have to install 64bit version as well STM32 Workbench as Java 64 bit version - in my case it have helped.
For more help in such problems see:
http://www.ashout.com/fix-java-started-returned-exit-code13-eclipse/
Related content
Development tools for Zephyr on STM32
Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.
Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.