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SubjectRe: [PATCH v4] irq: add quirk for broken interrupt remapping on 55XX chipsets
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On Thu, Apr 4, 2013 at 1:33 PM, Bjorn Helgaas <bhelgaas@google.com> wrote:
>> See my last email to Bjorn. Doing this in early-quirks in such a way that we
>> can detect an iommu that has interrupt remapping enabled (so we don't just
>> unilaterally print this quirk all the time) requires that we be able to parse
>> acpi tables very early in the boot. If you know of how to do that, I can make
>> this happen. If not, I suppose another alternative would be to have the early
>> quirk set a flag that tells us this is a bogus chip, and if we try to enable irq
>> remapping with that flag set, we should fail, and report the error at that time,
>> but I'm not sure I like that solution.
>
> I like that solution :) It seems very simple -- you don't have to
> parse any tables or anything.

You are right, we don't need to parse any acpi tables.

just add one quirk in early-quirk.c to set
disable_irq_remap = 1;

Thanks

Yinghai


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