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Re: [olpc-software] Source repository access



On Sun, 2006-03-26 at 20:24 +0800, Jaya Kumar wrote:
> On 3/23/06, Daniel P. Berrange <berrange redhat com> wrote:
> >
> >  http://fedoraproject.org/wiki/OLPC/Projects
> 
> I took a quick look and noticed:
> 
> - AMD Geode GX2  (CS5535)
> - Requires power management updates
> 
> Good request. I've implemented power management support for CS5535/6
> audio. I assume you are using the cs5535audio driver in 2.6.16. I've
> attached the diff against vanilla 2.6.16. I haven't mainlined this yet
> because I need to test against boards with headphone/main quirks. Let
> me know how it goes for you.
> 
> - Audio: AC97 codec (probably adding support for the AD1888)
> 
> AD1888 support in ALSA seems complete to me. Are you having a specific
> problem with it?

It works as far as it goes, as far as we know.

However, it could go further ensuring parts of the chips not in use are
off, and more importantly, entirely powering the chip off when not in
use, which the 1888 is capable of, and many other chips are not able to
do.  

As you might imagine, we care a whole lot about what our minimum power
consumption is, since the CPU will be able to suspend to RAM while
keeping the display running (using our DCON chip).  So our bottom end
power consumption when, say, reading a book and not doing anything,
should be in the neighborhood of .5 watts; even if we continue to
forward packets in the mesh, (which we can also do with the CPU
suspended, due to the choice of the Marvel wirless chip), we'll be in
the neighborhood of 1 watt.

So power consumption that would be lost in the noise on most systems
will be very significant on our system.  We'll be in the values normally
only seen on PDA's.
                               Regards,
                                   - Jim


> 
> There are other items on your kernel work list that look attractive to
> me. Let me know if you actually need help on them or already have
> people to work on them.
> 
> Best regards,
> jayakumar
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-- 
Jim Gettys
One Laptop Per Child



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