If you are talking about support for any raid devices created by this controller, then I would highly recommend going with a more modern distro, like Fedora http://fedoraproject.org/. As the others say, the new kernel and dm-multipath versions have support for this controller.
Fedora 12 was recently released, and I can confirm it has support for this raid controller. You can try a "Live" version that can boot from CD/DVD or a USB drive, without touching your harddisks. You can also try another Live distribution like PartedMagic: http://partedmagic.com/ I've used 4.5 and it properly detected a raid0 on this controller. Previous version of Fedora and PartedMagic only showed the individual drives, even though they were in a raid.
A quick note, since support was recently added, I know it isn't in Red Hat Enterprise Linux 5.4 (this is what CentOS 5 is built from), and it absolutely would not be in CentOS 4. RHEL (and thus CentOS) are built from stable Fedora releases, meaning anything in F12 would not appear in RHEL/CentOS until version 6. Check the timeline here:
http://en.wikipedia.org/wiki/RHEL
The latest RHEL/CentOS are based on Fedora 6, which was released in 2007. RHEL/CentOS 4 were released in 2005.