On Thu, 2021-11-25 at 17:02 +0300, Сергей Янович wrote:
> On Wed, 2021-11-24 at 13:17 +0300, Mike Banon wrote:
> 
> > P.S. I hope that your 1.8V chip wasn't partially damaged by a
> > temporary usage of 3.3V on it
> 
> It is possible, but seems unlikely. The chip correctly responds to
> flasrom probing queries. I suspect I activated a write protection of
> some kind. /WP is high at 1.81V now. So I am investigation software WP
> in the chip now.

SOLVED. For reference.

I guessed correctly. Both CMP and WPS bits got set in the status
register. The chip was successfully flashed after both bits were
cleared. I used a small C program for reading and writing. The program
was made along examples in [1].

1. 
https://www.emcraft.com/stm32f769i-discovery-board/accessing-spi-devices-in-linux

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