Re: PCI MSI breaks when booting with nosmp

[Pavel Machek]

On Mon 2008-04-21 21:44:34, Andi Kleen wrote:
> Pavel Machek wrote:
> > On Mon 2008-04-21 20:45:05, Andi Kleen wrote:
> >> Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx> writes:
> >>> Ok, I see this too on my desktop machine.  It looks like we're not getting 
> >>> interrupts setup correctly in the nosmp case.  Still digging through to see 
> >>> why though...
> >> NoSMP disables the io-apic and a lot of modern systems don't work
> >> without APIC.
> > 
> > Are you sure? I still boot DOS on very recent boxes, and they seem to
> > work. How can PC-compatible machine require an APIC?
> 
> The machine doesn't, but the drivers do. DOS likely doesn't use all
> hardware.

Should we be fixing drivers?

Do drivers even know? I'd expect core code in arch/x86 to shield
details of interrupt routing from them..

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