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From: Matthew Dillon <dillon@apollo.backplane.com>
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To: Scott Long <scottl@samsco.org>
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cc: freebsd-current@freebsd.org
Subject: Re: Potential source of interrupt aliasing
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    Sheesh Scott, you don't have to be nasty about it.  I'm just trying to
    help.  I've seen billions of interrupt routing related problems but
    not one interrupt aliasing issue.

    What I/O APIC chipset and stepping does Doug have on that motherboard?
    Intel has a ton of errata for their I/O APICs.  I see a mention of
    having to turn off earlier revs of the chip and revert to legacy 
    'boot interrupt' operation, but that's the only mention I see,
    and it's only for old versions (< B-0 stepping) of the 80332.  

    Still, perhaps the BIOS is doing this even with later revs of the chip
    in the MB.

    There's a reference to the '80332 I/O Processor' developers manual which
    implies a more detailed explanation of 'boot interrupt' operation.

    http://www.intel.com/design/iio/specupdt/27392703.pdf 

						-Matt