Using the recent GNU ARM Eclipse v2.11
(https://gnuarmeclipse.github.io/)
and following the installation instructions to the letter
including the Packs Download (takes a while).
The eclipse-mars-gnuarm-mchf-preferences.epf contains the exported
preferences from Eclipse Mars with a working debug configuration.
If you already configured Eclipse, you may not want to use it, then
follow the "images" in Eclipse-Debug-Settings to create a debug
configuration by making the entries marked with red boxes in
a new GDB OpenOCD Debug Configuration.
You should be able to debug live with an ST-LINK V2 in
no time at all.
