Re: [PATCH] linux-2.4.22-pre3_clear-smi-fix_A0

From: Maciej W. Rozycki (
Date: Tue Jul 08 2003 - 04:17:51 EST

On 7 Jul 2003, john stultz wrote:

> Some of our more recent hardware requires that SMIs are routed through
> the IOAPIC, thus when we clear_IO_APIC() at boot time, we clear the BIOS
> initialized SMI pin. This basically clobbers the SMI, which can cause
> problems with console redirection as well keeping us from being able to
> transition into full ACPI mode.

 That should be appropriately marked in the MP-table -- is it? I think
clear_IO_APIC() should use the MP-table to select pins marked as mp_INT
(and possibly mp_ExtINT) only. This way all special inputs are preserved.

 Your solution looks like a good hack for working around a broken
MP-table, but then a big fat warning should be printed about a BIOS bug.

+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+        e-mail:, PGP key available        +

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