RE: [PATCH 4/4] x86_64 ioapic: Improve the heuristics for whencheck_timer fails.

[Lu, Yinghai]

-----Original Message-----
From: ebiederm@xxxxxxxxxxxx [mailto:ebiederm@xxxxxxxxxxxx] 
Sent: Monday, January 08, 2007 8:11 AM
To: Linus Torvalds
Cc: Tobias Diedrich; Lu, Yinghai; Andrew Morton; Adrian Bunk; Andi
Kleen; Linux Kernel Mailing List
Subject: [PATCH 4/4] x86_64 ioapic: Improve the heuristics for when
check_timer fails.

>I have tested this on an Nvidia board that reports that apic 0 pin 2
>works when it does not and this code successfully programs apic 0 pin 0
>into ExtINT mode.

For some CK804 boards, BIOS forget set to 8254 timer to apic0/pin2, and
still leave it at apic0/pin0. but mptable and acpi said 8254 timer is to
apic0/pin2. At such case we should try apic0/pin0 with INT mode instead
of ExtINT mode.

YH




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