I just got a chance to take a quick look at the boot message from
NetBSD/hpcmips.  It looked fairly normal, with one exception:

...
pcic0 at isa1 port 0x3e0-0x3e1 iomem 0x70000-0x73fff irq 1507331
pcic0: controller 0 (Intel 82365SL Revision 1) has sockets A and B
pcic0: controller 1 (Intel 82365SL Revision 1) has sockets A and B
pcmcia0 at pcic0 controller 0 socket 0
pcmcia1 at pcic0 controller 0 socket 1
pcmcia2 at pcic0 controller 1 socket 0
pcmcia3 at pcic0 controller 1 socket 1
../../../../arch/hpcmips/vr/vr.c(294): vr_bus_reset() not implemented.
ISA IRQ 3 -> GPIO port 23
pcic0: using irq 1507331 for socket events
button manager
...

Note the very large irq for socket events.  I suspect that is bogus,
since it doesn't look like a small integer, nor an address, nor a
bitmask with one bit set.  Can anybody comment on that?  The only good
sign that I can see is that the irq does match the probe message's irq
:-).

Warner