linux-kernel - Re: kernel won't boot on a Cyrix MediaGXm (Geode )

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Message-ID: <4886DB31.8070306@sieb.net>
Date:	Wed, 23 Jul 2008 00:18:09 -0700
From:	Samuel Sieb <samuel@...b.net>
To:	Juergen Beisert <jbe@...gutronix.de>
CC:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	"Rafael C. de Almeida" <almeidaraf@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Magnus Damm <magnus@...inux.co.jp>,
	takada <takada@....nifty.com>
Subject: Re: kernel won't boot on a Cyrix MediaGXm (Geode )

Juergen Beisert wrote:
> On Dienstag, 22. Juli 2008, Ingo Molnar wrote:
>> could you try to figure out which particular use of getCx86() or
>> setCx86() makes the difference? Here are the suspect nested ones, for
>> which the macro->inline change can be material:
>>
>> $ grep -n 'Cx86.*Cx86' arch/x86/kernel/*/*.c > 1
>>
>> i've applied the patch below to tip/master:
>>
>>    http://people.redhat.com/mingo/tip.git/README
>>
>> could you check whether it boots your system fine, out of box?

It doesn't.

> The only critical tweak I found is the one that changes the "Performance 
> Control Incrementer" because its settings depends on the CPU's core 
> frequency.
> Maybe this tweak should be removed, because the BIOS (hopefully) set it in a 
> way the hardware supports.
> 
This was the only line that was a problem.  See the other branch of this 
thread with Juergen Beisert.

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