Thank you for your answers, so it means it is just a matter of configuration.... or a sofware bug maybe?
So I check again, on my board it is written:
- stm32f3discovery (MB1035C)
- I commanded it directly on ST website : http://www.st.com/en/evaluation-tools/stm32f3discovery.html
- I check the targeted MCU (Navigate to Project -> Properties -> C/C++ Build -> Settings -> Target) it is the good one
what should I do/try?