FC5: "Unknown interrupt or fault at EIP 00010006..."

[Gordon Hay]

Trying to install FC5 from CD, first boot fails with message

"Unknown interrupt or fault at EIP 00010006 00000060 c03a1e80"
and this message is endlessly repeated.

System is an old Compaq Proliant 2500, and FC4 runs fine.

Because of the Proliant's "memory hole", FC4 needs boot parameters
"memmap=exactmap mem=640k at 0 mem=95m at 1m"

Has something changed in this area with FC5?