Rob,
I am using a small (4"x6") SBC board with a NS Geode GX1 and CS5530 for a project. It's a complete PC on a 3.5" formfactor (300 MHz Geode, SODIMM, floppy, IDE, CF, serial, Ethernet, USB, keyboard, mouse, Video, LCD, PC/104). See: http://www.axiomtek.com/product-info.php?cat=Embedded+PCs&model=SBC84510VEE&... The config is similar to advantech's pcm-582X series. Should be possible to get LinuxBIOS support on these.
-Andrew -- Andrew Ip Email: aip@cwlinux.com Tel: (852) 2542 2046 Fax: (852) 2542 2036 Mobile: (852) 9201 9866 Cwlinux Limited Unit 202B 2/F Lai Cheong Factory Building, 479-479A Castle Peak Road, Lai Chi Kok, Kowloon, Hong Kong. Tel: (852)2542 2046 Fax: (852)2542 2036 For public pgp key, please obtain it from http://www.keyserver.net/en.