On 17.09.2017 03:51, junkheap(a)tiscali.co.uk wrote:
Thank you for the help Nico.
Your advice was successful. After connecting /HOLD & /WP to 3.3V,
Flashrom wrote & verified the W25Q64SIG without any error messages.
After previously checking the datasheet I thought that it was necessary
to do that. But I have little experience of electronics and thought it
wise to seek advice before trying, as all of the guides to programming
EEPROMs with Raspberry Pi I found on the web had always left those pins
Most guides probably assume that the chip is still soldered to a board.
In that case the circuit on the board pulls /HOLD and /WP already.
PS. Please always keep the mailing list in CC when you respond. Some
email clients have an extra button (e.g. "Reply all") for that.
On 16/09/2017 13:57, Nico Huber wrote:
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
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.