noapic only prevents that hardware interrupts are rerouted through the
io apic.
The inter processor interrupts still use the apic bus, and it's
impossible to use SMP without IPIs.
> Right now I'm running with noapic and nosmp and so far this seems to
> be working. I really would like to be able to use the second
> cpu so any suggestion would be greatly appreciated.
It could be a hardware problem, or the board uses an unusal io apic
that's not properly handled.
If you boot without noapic, are there any unusual message in the boot
log?
Perhaps
MP-BIOS bug
unknown io apic
etc.
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