stm32n6 - boot fail light

Brenden_PLUS · ‎2026-04-07

The boot fail light doesn't seem to function the way i would think it would.

When

* boot 0 == 0

* boot 1 == 0

* entire external flash == 0xff

* using STM32N6-DK

The boot fail light never seems to stay on? My thought is that part of the ROM would read the data from the flash do a CRC on the data and then if it matched then turn the light off. But it always seems to turn the boot fail led off no matter whats in the flash?

Amel NASRI · ‎2026-05-15

Hi @Brenden_PLUS ,

Sorry for the late reply.

Your question may have remained unanswered because it is not clear enough.

It would be helpful if you could specify the example you are referring to.

I suggest you refer to the article STM32N6 boot ROM explained, where you can find more insights into the boot process.

-Amel

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

Andrew Neil · ‎2026-05-15

@Amel NASRI wrote:
Your question may have remained unanswered because it is not clear enough.

Indeed.

@Brenden_PLUS - please see: How to write your question to maximize your chances to find a solution

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.