Very cool!
Now I understand better what was wrong in myoriginal pull request, hopefully it will help me improve my future PRs, thanks a lot!

PS: There's a last question if I may:

I had toremove the "WEAK" attribute for SystemClock_Config(), otherwise some of these parameters* were overwritten.

=> Could it be because it was (incorrectly) in variant_generic.cpp instead ofgeneric_clock.c?

*I think it was the Clock source or pre-scaler.

The function have to be WEAK to be able to overwrite it at sketch level that's all.

OK! Thanks!