linux-kernel - Re: System clock runs too fast after 2.6.27 -> 2.6.28.1 upgrade

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Date:	Sun, 25 Jan 2009 12:17:25 +0100
From:	Florian Fainelli <florian.fainelli@...ecomint.eu>
To:	john stultz <johnstul@...ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Miklos Vajna <vmiklos@...galware.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Gabriel C <nix.or.die@...glemail.com>,
	CSÉCSY László <boobaa@...galware.org>,
	r.schwebel@...gutronix.de, sven@...gus.net
Subject: Re: System clock runs too fast after 2.6.27 -> 2.6.28.1 upgrade

Le Saturday 24 January 2009 02:36:30 john stultz, vous avez écrit :
> On Fri, Jan 23, 2009 at 3:04 AM, Ingo Molnar <mingo@...e.hu> wrote:
> > * john stultz <johnstul@...ibm.com> wrote:
> >> I'd think this would ideally be more of a subarch in the config
> >> selection like the AMD Elan is, so folks know it really is not just a
> >> extra-support feature and in fact limits what hardware you can use the
> >> resulting kernel on.
> >
> > a better solution is that if RDC is set [it is unset by default] we
> > should turn PIT_TICK_RATE into a variable, defaulting it to 1193182. If a
> > real RDC or ELAN system is running, that variable is changed during early
> > bootup, in the init functions for those platforms.
>
> Took a quick look at this, and I don't see any detection code for
> either RDC. The X86_ELAN config also has no conditionals, but maybe
> the elan cpufreq code can help here.
>
> Florian: Is there any way we can check very early (ie: in setup_arch)
> for an RDC box?

Sorry for answering so late.

We cannot rely on the cpuid since there is not one, nor the bios, since most 
(if not all) boards use RedBoot as a bootloader. If we have PCI initiliazed, 
we could check the presence of a R6040 Ethernet MAC.
-- 
Cordialement, Florian Fainelli
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