From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Herbert Poetzl <herbert@13thfloor.at>
Cc: Ingo Molnar <mingo@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: apic and 8254 wraparound ...
Date: Fri, 24 Dec 2004 19:40:38 +0000 [thread overview]
Message-ID: <1103917238.18115.11.camel@localhost.localdomain> (raw)
In-Reply-To: <20041224200022.GA14956@mail.13thfloor.at>
On Gwe, 2004-12-24 at 20:00, Herbert Poetzl wrote:
> somehow I'm unable to locate it, I can see the
> 430TX and 430HX but not the 430NX and 430LX ...
>
> do you have an url for me?
Not to hand, its under the retired chipset stuff. The details are as
follows from memory
When you read one 8bit value from an 8254 timer the values latch for
read so that when you read the other half of the 16bit value you get the
value from the moment of the first read. On
neptune that didn't work right so you got halves of two differing
samples. That means the error would be worst case a bit under 300 (257
for the wrap + a few for timing)
next prev parent reply other threads:[~2004-12-24 20:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-24 0:11 apic and 8254 wraparound Herbert Poetzl
2004-12-23 23:37 ` Alan Cox
2004-12-24 20:00 ` Herbert Poetzl
2004-12-24 19:40 ` Alan Cox [this message]
2004-12-25 22:48 ` Herbert Poetzl
2004-12-26 18:08 ` Pavel Machek
2004-12-26 19:42 ` Herbert Poetzl
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