Getting raid card to work with linux?

Hi all,

I have a SuperMicro P5DBE with two P2-400's and 256M of ram.
There is one 3.2G ide drive connected to the first ide cable from the
mb that is set to master. There is one cdrom drive connected to the
second ide cable set to master. It loads Ubuntu 6.10 server i386
just fine. I also have a Silicon Image, Inc pci raid card plugged into
pci slot 4 on the mb with two Seagate 250G hd's connected to the
first ide channel. During the post, the mb sees the pci card and
assigns irq 10 to it. When I am in Linux and type the lspci command
I get:

00:12.d PCI Host Controller, Silicon Image, Inc., SIL0680 .....

So Linux sees it. But when I go to the /dev directory there should
be a file there called hde so I can partition and format the array and
it is not there. The one for the first hard drive connected to the mb
is there and it is called hda but hde is missing.

So my question is how do I get the pci card to work?

thanks,
charles......