sunhme.o+SMP, the fourth QFE port interrupt mystery

[Matt]

After plugging in a Sun QFE card into an HP LH6000r, with the kernel
compiled for SMP support, the fourth port can't get an interrupt. I can
get all four ports to come up if I don't compile SMP support in, but my
interrupt allocation ends up looking like this:

root@spud:~# cat /proc/interrupts 
           CPU0       
  0:      63234          XT-PIC  timer
  1:        521          XT-PIC  keyboard
  2:          0          XT-PIC  cascade
  5:       2395          XT-PIC  megaraid
  8:          1          XT-PIC  rtc
  9:       2029          XT-PIC  aacraid, aic7xxx, eth0, HAPPY MEAL, HAPPY MEAL, HAPPY MEAL, HAPPY MEAL
 12:          0          XT-PIC  PS/2 Mouse
 14:          3          XT-PIC  ide0
NMI:          0 
ERR:          8

...which I don't believe is conducive to an efficient system :-).

I've also tried enabling Local APIC support but that causes problems
elsewhere on this particular box, so I've left that alone. 2.4.16 is
the current kernel version on here.

Anyone have a fix for this?

Cheers

Matt

PS. Being a Sun card, all of the ports have a MAC of 00:00:00:00:00:00, I
can see four unique codes on the card that must be the last six digits of
each MAC, but what is the first six for a Sun QFE? I don't have another
plugged into a Sun box to see...