su, 2008-07-13 kello 03:48 -0700, Russell Sears kirjoitti: > The current software drivers do not save any state between GPS locks, so > the GPS device is needlessly re-downloading information from the > satellites each time it turns on. Downloading the data seems to require > a much better/more consistent signal than calculating the phone's > current position.
Doesn't just seem to, it does need a better signal. And yeah, being able to restore that data and/or get it from the network should provide much quicker first fixes. From #openmoko: <DocCod> cold start: like 10 minutes for a fix <DocCod> agps data feeded immediately after start: fix in 1 minute or less <DocCod> between 2 tall buildings, btw Anyway, as for the GPS problems some are having, I got a fix relatively quickly on a phone another guy had problems with from the first Finnish group batch. The difference mostly that he used some of the frontends and I grepped the device node directly. So there might've been some software glitches at work with eg. gsmd getting confused at the chip output (which includes large amounts of those spurious error messages and stuff). (Of course, it _might_ have been a flaky but not consistently faulty connection too; we'll keep an eye on the device if it starts acting up again.) So anyone who's having GPS problems should probably make sure it's hardware by checking out the GPS chip output at the lowest level by doing something like: echo 1 > /sys/devices/platform/s3c2440-i2c/i2c-adapter/i2c-0/0-0073/neo1973-pm-gps.0/pwron grep GPGGA /dev/ttySAC1 And seeing if there'll be fix-looking data within, say, 10 minutes to be sure, on a decent exposure of the sky. (You can do that remotely in a screen session and then attach to it with "screen -dr" from the OpenMoko terminal to make it easier to type it in but still get the output from the Neo.) See http://wiki.openmoko.org/wiki/GPS on what a fix looks like. Hope this helps someone. -- Mikko Rauhala - [EMAIL PROTECTED] - <URL:http://www.iki.fi/mjr/> Transhumanist - WTA member - <URL:http://www.transhumanism.org/> Singularitarian - SIAI supporter - <URL:http://www.singinst.org/> _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community