STM32L496: HardFault in FreeRTOS's xPortPendSVHandler when booting on bank 2

[milidam]

Hi,

I am trying to use the dual-bank mechanism of a STM32L496 MCU.

Using `BFB2` bit of User Configuration register, I am able to switch between bank 1 and bank 2.

My application, using FreeRTOS, runs without problem in bank 1.

However, when I set the `BFB2` bit, it properly boots from bank 2 (I can follow traces sent on the UART proving it), but I systematically get a HardFault, forced from a UNALIGNED fault, that seems to occur during the execution of FreeRTOS's `xPortPendSVHandler`.

Any idea what could be the cause of it ? or how to workaround it?

Thanks in advance for your help.

[Saket_Om]

Hello @milidam 

Please, ensure that the vector table offset register (VTOR) point to the correct address in the bank 2.

[milidam · Accepted solution]

Hi @Saket_Om ,

Thanks for the hint. However, that is the solution I could find on several forums when looking for similar problems, but it did not solve mine.

On the other hand, I think I found a solution: I was using FreeRTOS' `ARM_CM3` port, instead of the `ARM_CM4` (STM32L496 is Cortex-M4-based). With the later, I can run from bank2, so far, without HardFault.