Should be issues. I use a Adaptec USB / Firewire pci card with no problems. The needed modules will be ohci1394, raw1394, and sbp2. Check out this link for 1394 info on the modules. http://www.linux1394.org/
A great tool like usbview for usb is gscanbus for firewire.
edit: One thought is ieee1394 may not be compiled into or as modules with the default or precompiled update kernels. To see if you have them check by going to /lib/modules/<current_running_kernel_version/kernel/drivers/ and check to see if there is a directory called ieee1394. If you don't then you need to recompile the kernel. Easy to do under Redhat/Redhat clones.