[Sugar-devel] [support-gang] Overclocking XO / General Protection Exeption

[James Cameron]

Must be a different batch of processors or something.  Can you give us
some serial numbers and SKU numbers of the working and non-working
batch so that we can compare?  You can find these under the battery.

For XO-1, they were only tested in factory at 433/166.  If they passed
that, they shipped.

On Wed, Dec 05, 2012 at 10:16:56AM +0100, Dominik Granada wrote:
> Guys I need help / advice,
>  
> I have a problem with "General Protection Exception" on XO 1 it seems to be
> related to overclocking:
>  
> We have 30 XO from Peter (UK firends of OLPC) - no problem with those, after
> introducing DevKey and disabling-security we can flash XO with our version of
> Dex3/143 that includes overclocking and it works.
>  
> Surprisingly 10 XO we got thanks to Urs from OLPC Switzerland after flashing -
> crash with "General Protection Exception" notice. It seems to be related to
> overclocking. (as once turned off all works fine)
>  
> Any idea whether there is some more security we can turn off? (apart form
> Devkey / disable-security)
>  
> below info from my IT team:
>  
> when adding commands from ok prompt:
> ok 4c000014
> ok rdmsr
> ok u.
> ok u.
> ok 65d
> ok wrmsr
> ok boot
> works overclocked fine
> but adding a line:
>  
> 7de009e 65d 4c000014 wrmsr
> to file /boot/olpc.fth
> makes our image crash. Boot from separate olpc.fth file from usb doesn not work
> either. It works only when clock set to 433/166
> Many thanks for any hints / advice
> DG
>  
> 
> ----------------
> 
> Dominik Granada
> Prezes Zarz?du
> www.FRKS.pl
> 
> Tel.: 22 545 05 11
> Fax.: 22 545 05 10
> 

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-- 
James Cameron
http://quozl.linux.org.au/