Hi!
I have a P4-M266 AMPTRON motherboard. It's not supported by flashrom-0.9.1. It has SST(MPF)39SF020A.
The board looks like this:
http://www.motherboard.cz/mb/amptron/P4-M266A.htm
The wiki page says, flashrom supports PM266 - Albatron. It looks like:
http://www.motherboard.cz/mb/albatron/PM266A.htm
I attached the "./flashrom" output, and an "lspi -v -v" output.
I hope, this helps for You.
I have another motherboards, which are not supported.
Thanks for Your reply,
Gabor Szogyenyi