Message-ID: <465049BE.5000000@cv-sv.de>
Date: Sun, 20 May 2007 15:14:38 +0200
From: Christian Volkmann <haveaniceday@cv-sv.de>
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To: Claas Langbehn <claas@rootdir.de>
CC: Simon Arlott <simon@fire.lp0.eu>, linux-kernel@vger.kernel.org,
       Andi Kleen <ak@suse.de>
Subject: Re: Via C3/C7: other flags possible ?
References: <464B9D2C.7040704@cv-sv.de> <20070517004209.GE16810@redhat.com> <200705190753.16570.ak@suse.de> <464EE2AA.3030607@cv-sv.de> <464F332C.8060904@rootdir.de> <464F5C8F.5000304@cv-sv.de> <464F7C09.8060809@cv-sv.de> <464F7F90.2000900@simon.arlott.org.uk> <4650047F.4000804@rootdir.de>
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Bit 20 in edx is set if NX is available for C7:

eax in: 0x80000001, eax = 00000000 ebx = 00000000 ecx = 00000000 edx = 00100000
( from your posting "This kernel requires the following..." )

The official VIA Eden  datasheet seems to be NDA. I have not found any
official download link on the pages:
http://www.via.com.tw/en/products/processors/c7/
The /c3/ pages contain the documentation  for the C3 family.

I do not think the NX feature can be switched on/off by regular registers.

May be it helps to play around with the bios ?
Load "default settings" => see how the NX flag acts.
Load "optimized settings" => see how the NX flags acts.

I suppose the bios developer had used one setting to test and
work with the NX flag regular.

Christian


> If you read the other thread properly you'd see that the BIOS has an option to enable or disable it... when enabled it shows up.
PS: @Simon, sorry that I missed the other thread. Too much traffic
and not enough time for me to read all. I suppose that's a fulltime job ;-)

Claas Langbehn wrote:
> Simon Arlott schrieb:
>> On 19/05/07 23:36, Christian Volkmann wrote:
>>> Christian Volkmann wrote:
>>>> Claas asked for the NX flag for the Via C3 (?) processors
>>>> in another thread.
>>
>> If you read the other thread properly you'd see that the BIOS has an
>> option to enable or disable it... when enabled it shows up.
> 
> Right, but my bios disables this after each boot-time :(
> Therefore it would be great if the kernel would not care
> about the BIOS and enable it anyway.
> 
> This seems to be a severe bug in the BIOS, but VIA does not
> deliver a new BIOS since months. :(
> 
>>
>> I can't reboot that box just to test cx8 detection (which is missing).
>>
> It works here.
> 
> 
> 
> claas
> 

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