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From: Ian Stirling <root@mauve.demon.co.uk>
To: alan@lxorguk.ukuu.org.uk (Alan Cox)
Cc: linux-kernel@vger.kernel.org
Subject: Re: Changing CPU Speed while running Linux
Date: Sat, 16 Jun 2001 14:56:24 +0100 (BST)	[thread overview]
Message-ID: <200106161356.OAA08201@mauve.demon.co.uk> (raw)
In-Reply-To: <E15BG33-00083s-00@the-village.bc.nu> from "Alan Cox" at Jun 16, 2001 02:23:33 PM

> 
> > Can you dig that out? I'd like to take a look.
> > 
> > [Of course, problem is *not* solved: you still have short time when
> > kernel runs with wrong bogomips.]
> 
> Not really. WHen you do the speed change on most of these cpus you have to
> do it with IRQs off and with the PCI bridge temporarily disabled as the CPU
> disconnects from the bus during speed transititions and cannot take part in
> cache coherency

Though it's been a while, last time I read the elan sc400 (or was it the 
410, always get those two mixed up), datasheet, there were no 
special procedures needed, just change the speed.
This may have been because there is no external PCI bus.

  reply	other threads:[~2001-06-16 14:03 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-06-13 12:35 Sven Geggus
2001-06-13 13:21 ` Arjan van de Ven
2001-06-14 13:12   ` Pavel Machek
2001-06-16 10:46     ` arjan
2001-06-16 13:23     ` Alan Cox
2001-06-16 13:56       ` Ian Stirling [this message]
2001-06-13 13:41 ` Magnus Sandberg
2001-06-13 13:49   ` Dave Jones
2001-06-13 22:23 Dieter Nützel

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