Since the Gentoo Wiki lost their database, I can point you to their back-up:
http://www.gentoo-wiki.info/Genesi_Efik ... _usb_stick
This will help you find the right firmware commands.
I still have my older Efika images here:
(including a small one)
You can extract these on a ext2 formatted USB flash drive. (you still need a kernel too, but I suppose you have one?)
I still have an older kernel here:
Hope this helps.
If you have any problems, don't hesitate to ask - I'll do what I can.
Johan Dams, Genesi USA Inc.
Director, Software Engineering
Yep, I have a blog... PurpleAlienPlanet