Well, if the hard disk partition is on the first hard disk then I would think the hda1 or hde1 should of worked, depending on how your native IDE controllers are being seen.
Since they weren't, I would suggest watching the kernel ring buffer post its messages and see if the RAID controller is even being seen. You can use the [shift][PgUp] keys to scroll screen back up to review the messages. The kernel you are using (vmlinuz) is probably just the bare.i kernel for regular IDE controllers and may not provide support for the controller. Therefore the kernel may not even report the hard disk as present.
Also, you might post how you are booting the system. I do not think WinXP can boot to a DOS mode or shutdown to DOS mode. I would think you need to use a floppy disk or bootable CD to boot DOS first. Then run the linux.bat file.
Perhaps it has been of some help.