When I use "Generic STM32F1 series" board with Board part number: "BluePill F108C8 (128k)", and USB support = Nothing, and Upload method: "STLink", I can use Serial output at runtime. If support is not "Nothing", there's no output on the console.
I have tried to do the same with "Generic STM32F103C series" board, and Upload method: "STLink". At runtime, I cannot make output from Serial.println go to the console.
What am I doing wrong ?