Redhat 7.3/8.0 stock install with SCSI RAID

[Sean McMurray]

Hardware:
Intel SR2300 server (SE7500WV2 motherboard)
Single Xeon 2.2Ghz processor
512 MB RAM
Adaptec 2110S SCSI RAID controller
   (Adaptec I20 BIOS V001.41 (2001/07/13)  FW380)
6 Seagate ST318406LC SCSI harddrives in RAID5 array

Software:
Redhat 8.0
grub 0.91

Grub menu:
558K lower / 523200K upper memory


I've just installed Redhat 8. It installs fine and on reboot, I get the 
following screen after making a selection from the grub menu:

Booting 'Redhat Linux-up (2.4.18-3)'

root (hd0, 0)
Filesystem type is ext2fs, partition type 0x83
kernel /vmlinuz-2.4.18-3 ro root=/dev/sda3
[Linux-bzImage, setup=0x1400, size=0xfa203]

Error 28: Selected item cannot fit into memory

Press any key to continue...

(Pressing a key takes you back to the grub menu.)

I have tried turning off Int13 in the Adaptec BIOS: didn't help.
I have replaced the 2110S with a 2100S: didn't help.
I have tried installing Redhat 7.3 instead: same error.