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SubjectRe: [PATCH] MSI interrupts: disallow when no LAPIC/IOAPIC support
On Tue, Sep 27, 2005 at 11:37:50PM +0100, Alan Cox wrote:
> On Maw, 2005-09-27 at 17:26 -0400, Jeff Garzik wrote:
> > Grant Grundler wrote:
> > > I've no clue why folks thought it was better to ignore
> > > the IO APIC on UP kernels.
> >
> > Hysterical raisins: the -majority- of the early uniprocessor systems
> > that claimed IOAPIC support were broken.
>
> Not really broken in most cases, but since nobody was using the APIC
> board makers didn't bother wiring for it.

ok. Any clue how PCI IRQs got routed/handled on those boxes?
Did UP boards have an 8259 PIC and an IRQ line to the CPU?
Could an 8529 PIC even co-exist with an IO APIC?

Or was it something more silly like BIOS mfgs had no version
of Windows that could grok a IRQ routing table and thus no
incentive to enable that feature?

thanks,
grant
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