According to RM0433 Rev 8:
The Run* mode is entered after a POR reset and a wakeup from Standby. In Run*
mode, the performance is limited and the system supply configuration shall be
programmed in PWR control register 3 (PWR_CR3). The system enters Run
mode only when the ACTVOSRDY bit in PWR control status register 1
(PWR_CSR1) is set to 1.
and
As long as ACTVOSRDY indicates that voltage levels are invalid, the system is in
Run* mode, write accesses to the RAMs are not permitted and VOS shall not be
changed.
Now, the startup code first jumps (bl ExitRun0Mode) to the C function `ExitRun0Mode()` which probably might involves writes to stack.
Is this construct (calling a C function from ASM) just relying on the compiler not touching the stack or am I'm reading the docs wrongly?
best regards
Torsten
Bootloader off-the-shelf
