[flashrom] Winbond W25Q64FVSIG - "ERASE FAILED!"

[Nico Huber]

Hi,

On 15.09.2017 18:56, junkheap--- via flashrom wrote:
> I am trying to write to a Winbond W25Q64FVSIG EEPROM (SOIC-8) using
> Flashrom and a Raspberry Pi 3 (running up to date Raspbian). But I
> receive the message "ERASE FAILED!".
> 
> I am using the shortest wires which are practical to connect to the
> Raspberry Pi (~10CM) and I have checked many times that I have connected
> to the correct GPIO pins. To make sure that there is a good connection,
> I abandoned the clip I was using and have soldered the EEPROM to the
> pads on a daughterboard (designed for the purpose). The wires I am using
> have factory-fitted female terminals on both ends and connect tightly to
> the GPIO pins on the RPI and pin head on the daughterboard.
> 
> From what I have found some people have flashed this model of EEPROM
> successfully using Flashrom, but others have encountered the same
> problem. I have not been able to find a solution. If anyone can offer
> assistance or advice I would me most grateful. Thank you.

I see two possible causes:

1. You probably didn't connect all pins of the flash chip. You have to
   pull /HOLD and /WP high (connect them to 3V3, preferably through some
   resistor) to succeed.

2. You run the SPI interface at a too high clock. As you didn't supply
   a `spispeed` argument to the linux_spi programmer, it will at run
   at some (to me unknown) default speed.

Nico