linux-kernel - Re: IO-APIC + timer doesn't work

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Date:	Thu, 21 Dec 2006 14:40:01 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Lu, Yinghai" <yinghai.lu@....com>
Cc:	"Tobias Diedrich" <ranma+kernel@...edrich.de>,
	"Linus Torvalds" <torvalds@...l.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Andi Kleen" <ak@...e.de>, "Andrew Morton" <akpm@...l.org>
Subject: Re: IO-APIC + timer doesn't work

"Lu, Yinghai" <yinghai.lu@....com> writes:

> -----Original Message-----
> From: ebiederm@...ssion.com [mailto:ebiederm@...ssion.com] 
> Sent: Thursday, December 21, 2006 12:47 PM
> To: Lu, Yinghai
>>> +static int add_irq_entry(int type, int irqflag, int bus, int irq,
> int apic, int
>>> pin)
>
>>This is fairly sane but probably belongs in mptable.c as a helper.
>
> mparse.c?

yep.

>>I am still trying to understand this enable_8259A_irq(0) case.
>>As far as I can tell this is a very backwards way of enabling
>>an ExtINT, as such it shouldn't be used until later.
>
>>YH do you have any insight why on some Nvidia chipsets we apic 0 pin 2
> doesn't
>>work for the timer interrupt.  I thought that was what we were using in
> LinuxBIOS
>>for the mptable.
>
> CK804's has problem. But later one seems fixed that problem.

Do you have any details?

Eric
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