How do I get STM32G474RE (Nucleo Board) in to the Bootloader

[Peter Allnutt]

I've read AN2606 and it says use Pattern 14 for the G474 series. My understanding from this is a new board should enter the inbuilt bootloader simply by pulling the BOOT0 pin high. This does not work for me.

Using STLink I can see the the option bits and BOOT_LOCK=0, nBoot1=1 and nSWBoot0=0. I've tried with nSWBoot0=1 to and the micro still just runs the user code in flash.

I can get into bootloader on an F4 Discovery Board and a F4 Nucleo Board by pulling the BOOT0 pin high but not my G474 Nucleo Board. What I am missing/doing wrong?

TIA

Pete

[Peter Allnutt · Accepted solution]

Ok seems I might have posted a bit prematurely. Setting option bit nSWBoot0 to 1 does seem to allow me in to the bootloader :flushed_face: Although it enters the bootloader irrespective of the BOOT0 pin state.

This observation still doesn't seem to fit in with the expected operation as per the the AN2606 document.

[RPG]

Hi Peter. Could you help me with same issue here? I am struggling trying to set same board into bootloader mode via software. Documentation mentions BOOT_LOCK which I don't know how to set it to 0.

Thanks in advance,

Raúl