FYI
The Asus P8P67 Pro B3 Rev. flashes properly. It's not on your list so I thought I would let you know. I recently updated my BIOS to 3207 which really sucked and messed up a lot of uefi features. I mean bad. No way to downgrade via Asus. Downgrading 3207 back to 2303 worked without any problems. Your software is a life saver!
Some info: flashrom v0.9.5.1-r1508 on Linux 3.4.0-rc5-ger (x86_64), built with libpci 3.1.7, GCC 4.6.2, little endian flashrom is free software, get the source code at http://www.flashrom.org
Calibrating delay loop... OK. Found chipset "Intel P67". Enabling flash write... OK. Found Macronix flash chip "MX25L3205" (4096 kB, SPI) at physical address 0xffc00000.