STM32F7xx: How to read DBGMCU_IDCODE from bootloader?

[fckruegel_opto]

Hi;

In order to determine exactly the chip type I'd like to read the DBGMCU_IDCODE register. When I try to do this the bootloader hangs. RM0410 44.6.1 says "Only 32 bit access support". I guess the bootloader uses byte access.

Is there a workaround?

Reading UID and FLASHSIZE works just fine.

 

[Andrew Neil]

Which bootloader are you referring to?

[fckruegel_opto]

the internal ROM bootloader

 

[Andrew Neil]

But that's fixed code, which you can't modify - so how does you reading DBGMCU_IDCODE relate to that?

Perhaps you show a minimum but complete example which illustrates the issue.

 

How to insert source code.