Single Stepping with STM32F7
Just to follow up myself:
http://www.keil.com/support/docs/3778.htm
describes the problem as a problem connected to the M7 core revision. Argh!
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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.