Hi All,
I had a hell of a time sussing how do get slackware to install on a 5i Raid control ler but did it in the end, I have documented what I have done (I hope it makes sense) to save others having to pull their hair out
Install Slackware
then reboot onto with the CD and log in as root
then mount /dev/cciss/c0d0p1 /mnt -t ext3
cciss is how the HP/compaq 5i raid controller is known
change to /mnt/etc
make sure your lilo.conf is similar to below
chroot /mnt/
lilo -M /dev/cciss/c0d0 mbr
and reboot

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xxxxxx:/etc# cat lilo.conf
# LILO configuration file
# generated by 'liloconfig'
#
# Start LILO global section
lba32 # Allow booting past 1024th cylinder with a recent BIOS
boot = /dev/cciss/c0d0p1
#compact # faster, but won't work on all systems.
#prompt
#timeout = 5
# VESA framebuffer console @ 1024x768x256
vga = 773
# Normal VGA console
# vga = normal
# VESA framebuffer console @ 1024x768x64k
# vga=791
# VESA framebuffer console @ 1024x768x32k
# vga=790
# VESA framebuffer console @ 1024x768x256
# vga=773
# VESA framebuffer console @ 800x600x64k
# vga=788
# VESA framebuffer console @ 800x600x32k
# vga=787
# VESA framebuffer console @ 800x600x256
# vga=771
# VESA framebuffer console @ 640x480x64k
# vga=785
# VESA framebuffer console @ 640x480x32k
# vga=784
# VESA framebuffer console @ 640x480x256
# vga=769
# ramdisk = 0 # paranoia setting
# End LILO global section
# Linux bootable partition config begins
image = /boot/vmlinuz
root = /dev/cciss/c0d0p1
label = Slackware
read-only # Non-UMSDOS filesystems should be mounted read-only for checking
# Linux bootable partition config ends