ok found more information:
http://www.chromium.org/chromium-os/developer-information-for-chrome-os-devi...
December 2010 Google Cr-48 Mario support unknown/no
June 2011 Samsung Series 5 Chromebook Alex support unknown/no
July 2011 Acer AC700 Chromebook ZGB support unknown/no
May 2012 Samsung Series 3 Chromebox Stumpy support yes: choose mainboard vendor samsung
May 2012 Samsung Series 5 550 Chromebook Lumpy support yes: choose mainboard vendor samsung
October 2012 Samsung ARM Chromebook Snow (aka Daisy) November 2012 Acer C7 Chromebook Parrot January 2013 Lenovo Thinkpad X131e Chromebook Stout February 2013 HP Pavilion 14 Chromebook Butterfly February 2013 Google Chromebook Pixel Link support of all 5 yes: choose mainboard vendor google if you have information about the support of the other (guess no support) please contribute..
ok and they have nice pictures of the mainboards (link above)
now we need to identify the spi chips on the board and will write up the wiki but I will try doing that tomorrow...