OLPC XO 1.5 overheating problems

Ed McNierney ed at laptop.org
Sat Oct 3 11:19:57 EDT 2009

Tiago -

Well, everyone gets to contribute something to thermal problems :-)   
But the CPU's the main source and also provides internal throttling  
mechanisms to manage it (along with the external heatspreader  
mechanisms, of course).  The A-phase boards were designed to get the  
thing up and running, and for A-phase machines (produced only in the  
dozens) it's completely OK to tell folks to do all kinds of funky  
things to keep them running.

No, the FTL is integral to the microSD card itself, so we're not using  
(and don't need) an external FTL for it.

	- Ed

On Oct 3, 2009, at 10:56 AM, Tiago Marques wrote:

> Hi Ed,
> I was wondering if it's related to the CPU or Northbridge. I said the
> description was unclear to me because it didn't mention where the
> overheating was from, or if you had already found the problem. Some
> videos of pre production units were shown running with just a square
> of thermal interface material acting as an heatspreader and I found
> that odd, even for alpha level units, that Quanta was shipping them
> back to you that way.
> Also, I'd like to ask something off topic(better to post another
> mail?) but I couldn't find any description on the wiki about the flash
> controller. Are you still using one - and if so which - or are you
> just using the microSD card's FTL?
> Best regards,
> Tiago Marques
> On Sat, Oct 3, 2009 at 3:34 PM, Ed McNierney <ed at laptop.org> wrote:
>> Tiago -
>> Sure, but what kind of elaboration would you like?  These are pre- 
>> production
>> machines and have an assortment of problems, this being one of  
>> them.  I
>> think the description is pretty clear; if you have a question about  
>> it
>> please let us know - thanks!
>>        - Ed
>> On Oct 3, 2009, at 10:13 AM, Tiago Marques wrote:
>>> Hi all,
>>> Hope this is the appropriate list to post this, I apologize if not.
>>> Please be kind to redirect me to the appropriate one if so.
>>> Referring to:
>>> "The B2 prototypes have shown a tendency to overheat. We are working
>>> on a more respectable solution than simply throttling back the
>>> processor. In the meantime, be aware that the laptop may begin to
>>> function erratically if it gets too hot. This usually manifests  
>>> itself
>>> as problems reading/writing the internal SD card. "
>>> Can someone please elaborate on this?
>>> Best regards,
>>> Tiago Marques
>>> _______________________________________________
>>> Devel mailing list
>>> Devel at lists.laptop.org
>>> http://lists.laptop.org/listinfo/devel

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