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SubjectRe: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
Rene Herman wrote:
>>
>> Yes, we do. It's exactly this side effect which makes this safer than
>> either 0x80 or 0xED -- it's a port that *guaranteed* can't be
>> reclaimed for other purposes without breaking MS-DOS compatibility.
>
> I see that with CR0.NE set (*) we indeed don't care about IGNNE#...
>
> However, I'm worried about this comment in arch/x86/kernel/i8259_32.c
>
> ===
> /*
> * New motherboards sometimes make IRQ 13 be a PCI interrupt,
> * so allow interrupt sharing.
> */
> ===
>
> Is it really safe to just blindly negate IRQ13 on everything out there,
> from regular PC through funky embedded thingies?
>

It's not any IRQ 13, it's IRQ 13 from the FPU.

-hpa


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