[LinuxBIOS] mcp55 flashrom problem

Ward Vandewege ward at gnu.org
Thu Mar 1 15:04:19 CET 2007

On Thu, Mar 01, 2007 at 11:40:28AM +0100, Stefan Reinauer wrote:
> Ward Vandewege wrote:
> > So, you've verified that the image that flashrom reads matches what you can
> > download from the manufacturers website (extracted)?
> There will often be small differences between those, too. ie. in the
> "DMI area".

Sure. This one was entirely different.

> > Flashrom doesn't crash or anything here, and it might just *write* fine (not
> > tested yet), but reading gives the wrong data. 
> Don't try it unless reading works reliably. Writing "requires reading"
> for the write to work. (It polls for the data to "arrive" in the chip")

Yeah, sure.

> > We know, because we got the ID
> > for the chip back, that at least a couple of writes to the chip succeeded.
> Weird. This is a pretty good sign that shadowing is disabled, normally.
> Maybe not all of shadowing is disabled? only half the chip?

I really don't know. I'm glad we caught this bug though - given that this
board doesn't have a socket (at least in the rev that we have), it might have
led to a nasty surprise for someone.


Ward Vandewege <ward at fsf.org>
Free Software Foundation - Senior System Administrator

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