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SubjectRe: Unexpected IO-APIC messages

The linux-smp mailing list is still alive (I won't say Active,
although some emails there do get replies).

The geocrawler archive isn't a good one to check.
Try this one instead:

You are right about the noisy message(s). The newer
IO APICs aren't in the kernel's known devices list yet.
There was a patch submitted about 2 months ago for this.
It hasn't been added to the kernel tree yet, but it
does need to be added IMO.


Dave Johnson wrote:
> When booting up 2.4.2-2smp (RH 7.1) on a new system here, the kernel
> complains about the IO-APIC register contents, and asks that mail be
> sent to
> It appears that the linux-smp list is defunct; at least there have been
> no new messages archived on geocrawler since August 2000. It also
> appears that the new IO APIC reg01.version of 0x20 was reported about
> a year ago on the linux-smp list, and reg_01.__reserved_2 of 0x80 was
> reported on this list around February 2001.
> The relevant dmesg info from our machine follows:
> ----
> testing the IO APIC.......................
> IO APIC #2......
> .... register #00: 02000000
> ....... : physical APIC id: 02
> .... register #01: 00178020
> ....... : max redirection entries: 0017
> ....... : IO APIC version: 0020
> WARNING: unexpected IO-APIC, please mail
> to
> WARNING: unexpected IO-APIC, please mail
> to
> .... register #02: 00000000
> ....... : arbitration: 00
> ----
> The APIC information from lspci -v follows:
> ----
> 03:00.0 PIC: Intel Corporation 82806AA PCI64 Hub Advanced Programmable Interrupt
> Controller (rev 01) (prog-if 20 [IO(X)-APIC])
> Subsystem: Intel Corporation 82806AA PCI64 Hub Advanced Programmable Int
> errupt Controller
> Flags: fast devsel
> Memory at fe400000 (32-bit, non-prefetchable) [disabled] [size=4K]
> ----
> If anyone is planning to do anything about new IO-APIC versions and stuff,
> at least the mailing list address should be corrected.
> If nobody cares until a bug comes along, perhaps the message should be
> changed to say "unrecognized" or "unknown" rather than unexpected, so
> the d**n users don't pee in their pants when they see the boot log
> scrolling by.
> Or maybe just parse and print out the values and refer the user to
> linux/Documentation/i386/IO-APIC.txt (which also still refers to the
> linux-smp mailing list) for further information.
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