From: "Randy.Dunlap" <rddunlap@osdl.org>
To: "Russ W. Knize" <russ@knizefamily.net>
Cc: linux-smp@vger.kernel.org
Subject: Re: Tyan Tiger 100 (S1832) IO-APIC Problems
Date: Wed, 25 Feb 2004 08:44:15 -0800 [thread overview]
Message-ID: <20040225084415.78d099f5.rddunlap@osdl.org> (raw)
In-Reply-To: <1077690954.28353.6.camel@localhost>
On Wed, 25 Feb 2004 00:35:55 -0600 Russ W. Knize wrote:
| Just in case anyne might be interested, I have been trying to debug this
| issue. It seems that pirq_find_routing_table() is not locating the
| table in the range it is looking. I turned on debug trace and added
| some other debug code. The PIRQ signature is not there in that range at
| all. Without the table, the router is not identified. I also tried
| forcing ACPI to be enabled, but that didn't seem to help.
I don't know anything about the Tyan Tiger 100, but the PIRQ table
was an M$ creation for Win 98 or thereabouts. ACPI interrupt
routing has replaced it on some systems, so I don't find it
surprising that the PIRQ table isn't found. Of course, I guess
that it could be there and Linux just isn't finding it, wherever
it's hidden. Tough to say which case it is.
I also don't recall the particular problems that you are having.
Is it IO-APIC problems (as in $Subject), or is it just interrupt
routing in general? If the latter, perhaps asking your questions
on the Linux ACPI mailing list would lead to some answers for you.
(acpi-devel@lists.sf.net)
| Whether or not any of this matters in the end is a little unclear to me
| at this point. I have experience with (c)PCI, but not on x86 hardware.
| Is there an online resource that explains how the APIC is supposed to
| work in a bit more detail? There aren't very many comments in the code
| to go on.
There are APIC and IO-APIC datasheets available from Intel and
probably other processor and chipset manufacturers, but they are
sorely lacking in anything similar to a theory of operation.
--
~Randy
next prev parent reply other threads:[~2004-02-25 16:44 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-17 21:02 Tyan Tiger 100 (S1832) IO-APIC Problems Russ W. Knize
2004-02-18 6:52 ` Russ W. Knize
2004-02-19 1:38 ` Russ W. Knize
2004-02-25 6:35 ` Russ W. Knize
2004-02-25 16:44 ` Randy.Dunlap [this message]
2004-02-25 17:23 ` Russ W. Knize
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