Compaq Proliant 2xPPro hangs on boot

[Chris Boyd]

I have a Compaq Proliant 800 with dual PentiumPros that hangs on boot 
when I try to use an SMP kernel with 4.7 or 4.8.  The error messages 
are:

	Changing APIC ID for IO APIC #0 from 0 to 2 on chip
	Programming 24 pins in IOAPIC #0
	IOAPIC #0 intpin 2 -> IRQ0

at which point it hangs.

Box runs fine with a single CPU kernel.

Looking through the list archives, I found some references to changing 
a BIOS setting to resolve the problem, but this machine does not have 
any similar settings.

Any hints, tips trick, or pointers appreciated.

--Chris