[flashrom] flashrom success with GD25Q20(B)

Gilles Auréjac gilles at polysoft.fr
Tue Jan 6 11:58:11 CET 2015

Hi Stefan,

I understand that it looks strange, but yes it is a small 6-pin package, with I maybe wrongle identified as a 6-pin sot23 (or sot23-6) package.
I'm not sure about the pinouts, though (I easily found vdd and vcc, bot on other trace are hard to follow on the board of the graphic card)
Whith a magnifier I only manage to read the two letters YU on the package... 

What is strange is with those packages I only found datasheets of smaller eeprom (1k, 2k, but not 1 or 2Mbits which is the attempted size regarding the size of bios of those products)

I'll run the command and send you photos later this day



Gilles Aurejac
Polysoft Services

Le 6 janv. 2015 à 11:10, Stefan Tauner <stefan.tauner at alumni.tuwien.ac.at> a écrit :

> On Tue, 6 Jan 2015 02:54:31 +0100
> Gilles Aurejac <gilles at polysoft.fr> wrote:
>> you're right I did wrote to the flash ship twice (and forgot the -V option the first time).
>> I'm confident that the write operation worked : I first have read and save, then updated this chip (2nd bios chip of a gtx 770 nvidia card) succesfully with flashrom and compared with an hexadecimal the 2 dumps which reported the attempted differences.
>> If you wish I can ran the write operation again and send you the result.
> Hi,
> no need, I just wanted to make sure.
> I have marked the flash chip as fully tested and will commit that later
> together with other small changes.
>> Also I did not have the same success with the 1rst bios chip which is not recognized (0Kb) by flashrom, and neither by nvflash under windows (nvflash says : unknown eeprom - BF,008D : this is a SST chip)
>> This is a 2Mbits spi eeprom with a sot-23 package.
> sot-23 would be pretty spectacular... because that has only 3 pins ;)
> I believe you mean SOIC-8 instead.
> SPI flashes can use a few different ID methods which often share (parts
> of) ID bytes. 0xBF is indeed the SST vendor ID... and 0x8d is even (the
> main) part of a known device: the SST25VF040B. But it should be
> detected ok with flashrom. Can you please send us the log produced with:
> flashrom -p buspirate_spi:dev=COM5 -VVV -o SST25VF040B_probe_spew.log
> Maybe I can spot what/if something is wrong.
> The top marking of the chip would also help very much in verifying if
> it is a SST25VF040B or something else.
> -- 
> Kind regards/Mit freundlichen Grüßen, Stefan Tauner

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