Reason for GPS problems found!

[nick loeve]

Hi

On Wed, Jul 16, 2008 at 9:33 AM, Alexey Feldgendler
<alexey at feldgendler.ru> wrote:
> On Tue, 15 Jul 2008 22:41:44 +0200, ian douglas
> <ian.douglas at iandouglas.com> wrote:
>
>>>> The note attached said:
>>>> "GPS internal antenna issue appears to respond positively to cranking
>>>> RF_3V to 3.6V from 3.0V."
>
>>> it is a SNR issue for sure, and to boost SNR you either
>>> boost signal (which is what voltage raise does) or you reduce noise
>>> (which what removal of SD card seems to be doing).
>
>> Andy submitted another patch within the last day or so that toyed with
>> the voltage levels of the SD circuitry, but his notes indicate that it's
>> more to do with data stability than noise/interference with the GPS unit.
>
> I'd love to test with that patch. Is it in a daily build?

FWIW i just flashed
http://buildhost.openmoko.org/daily/freerunner/200807/20080715/uImage-om-gta02-latest.bin
today and i got a fix outside with my sd card inserted. Previously i
never saw a satellite unless i took it out.

Did that build have the patches i see at
http://git.openmoko.org/?p=kernel.git;a=shortlog;h=andy ?

Cheers

>
>
> --
> Alexey Feldgendler <alexey at feldgendler.ru>
> [ICQ: 115226275] http://feldgendler.livejournal.com
>
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-- 
Nick Loeve