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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?

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      Last update: 2005-09-29 05:30    [W:0.024 / U:24.496 seconds]
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