Thank you STOne-32. When you say ''this RAM area is not ensured by ST to be functional '' , I really hope you mean RAM area between 10k and 20k and not the first 10K area!!
Ride and IAR users, make sure you have the RAM configuration right !! This could be wrong on many of the chip variants. I have been using Ride, and this is how fixed it. Change the line ''RAMSize =20480'' to ''RAMSize =10240'' in STM32F101V8T6.sim file (in your ''....\Ride\Sim\ARM'' directory)