[flashrom] [coreboot] Dual flash chip mod

[Carl-Daniel Hailfinger]

I'm copying the flashrom list because this is no longer coreboot
related. Followups to flashrom at flashrom.org please.

On 29.07.2009 17:16, Peter Stuge wrote:
> Ivan Barrera A. wrote:
>   
>>> Ok. If there is physical room for another chip inside the machine you
>>> can just connect all important signals across (maybe 10 or so), build
>>> a simple transistor switching circuit for the chip select line and
>>> finally run only three wires out of the machine. They can be as long
>>> as you like.
>>>       
>> I think there is room at a side of the plcc socket i put. How long
>> could those wires be ?
>>     
>
> A few cm should be fine but keep them as short as possible.
>
> You need pins 2 (7 8) (9 10 11 12) 13 14 15 16 17 24 25 28 29 31 32
>
> Hm, that's 12 but some are the same signal. The ID pins and MODE can
> probably be tied to either VDD or VSS but check their connections on
> the original chip first.
>   

If we're dealing with FWH chips on ICH, you can solder both chips on top
of each other with all pins except ID0. ID0 needs to be connected to a
switch so that exactly one of them is high and the other one is low.


>> Or try to fix the flashrom for my board :)
>>     
>
> That would also be nice, but the chipset could be locked down a bit
> too much to make it comfortable.
>   

Still, we should try it. Ivan, can you mail flashrom at flashrom.org with
the output from "flashrom -V" for that chip?

Regards,
Carl-Daniel

-- 
http://www.hailfinger.org/