First time responder so I apologize in advance if I forget some of the mailing list etiquette but...

I had previously installed CentOS 5.5 on a Geode LX platform (the ALIX boards available from PC Engines) and to accomplish this I simply used another PC to install to the compact flash card and modified what I needed to before booting the ALIX PC with it (SDA to HDA mainly).

If the option is available to you that is by far the easiest way to go about it.