@Vidar Berg : is it possible that the code above doesn't work with Keil code optimization? I am using Keil and developpement phase was fine without code optimization (level 0), then compile for production with optimization level 3 and errors occur?!
did not manage to reproduce this, but please try to add a DSB instruction after 'unprotect' line to ensure that the register is set before you access the power register (i.e., __DSB()).
