5.1 on an A31p

So, after a long pause, I'm trying to get 5.x working on my IBM A31p.
I've made a boot CD from the 5.1 ISO images, vintage a week or so ago.
When I boot (in any mode, ACPI on or off, or Safe), it dies immediately
after discovering firewire:

firewire0: <IEEE1394(FireWire) bus> on fwohci0



Fatal trap 12: page fault while in kernel mode
fault virtual address  = 0x2c
fault code             = supervisor read, page not present
instruction pointer    = 0x8:0xc02e5a50
stack pointer          = 0x10:0xc0ae39b0
frame pointer          = 0x10:0xc0ae39b4
code segment           = base 0x0, limit 0xfffff, type 0x1b
                       = DPL 0, pres 1, def32 1, gran 1
processor eflags       = interrupt enabled, resume, IOPL = 0
current process        = 0 (swapper)
trap number            = 12
panic: page fault

Now what?

Cheers,

Ben.

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