[CentOS] Booting from Compact Flash

Hi all,

Advance apologies if this is OT; if so, please mail me offlist.

A client is considering using CentOS5.1 for an embedded project.  They 
will be booting from Compact Flash.
The CF in the device is being controlled by a VIA VT6421 SATA/RAID 
controller.

Are there drivers available or must we truly 'roll our own' when 
compiling the 2.6x kernel for this?  I've done some searching in the 
archives and on the site, but to no avail
Also, are there any pitfalls we should be aware of up front? (any 
experience here is better than ours at this point!)

Any help will be greatly appreciated.

Thanks in advance,
-Ray