[flashrom] flashrom success with GD25Q20(B)

Stefan Tauner stefan.tauner at alumni.tuwien.ac.at
Tue Jan 6 13:44:58 CET 2015

On Tue, 6 Jan 2015 11:58:11 +0100
Gilles Auréjac <gilles at polysoft.fr> wrote:

> 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

There exist sot23-6 SPI *EEPROM* chips with the usual EEPROM densities
of a few kilobits, but I don't think there exist any NOR *flash* chips
with such a package. Of course it could be a custom package but I won't
believe it until I see it :)

I believe that nvflash is operating on an entirely different chip than
you do externally with flashrom (I presume you have hooked up an
external programmer to the chip). You should look out for a SOIC-8
chip. Either that or a BGA chip that won't be very easy to interact
with externally...
Kind regards/Mit freundlichen Grüßen, Stefan Tauner

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