On Tuesday 15 July 2008, Kalle Happonen wrote: > Yaroslav Halchenko wrote: > > indeed, especially since I see possibility for it to be twofold: if it > > is not purely an issue of SD card in place putting physical stress on > > the board somehow (would be worth checking with dummy plastic > > insert instead of real SD card), it means that > > I just ran three tests. Without SD card, with SD card with tape over the > contacts, and SD card normally. This doesn't seem to be mechanical, > since the first two cases got fixes in ~45 seconds, and with the SD card > actually in and working I stopped waiting after 10 minutes.
I did the same test with the same conclusion - physical presence of card with contacts covered gives the same result as no card - in my case fix in 135s with about 5s variation either side, 7 sats in view from a location indoors near a window. Uncovering the contacts found time and 2 sats after ~200s but no more before I gave up a couple of minutes later. I was looking for something under /sys/devices/platform/glamo3362.0/glamo-mci.0/mmc_host to power the interface down and try it that way. Not spotted anything that looks like the bluetooth or gps power interfaces though :-( Perhaps I'm looking for the wrong thing... > It'll be interesting to see what removing the SD card does to the > battery life, if anything. > > > 1. either SD card is powered all the time (which afaik is not needed for > > the flash memory ;-)), thus leading to power drain without need > > > > 2. some component on the way (e.g. capacitor) is noisy > > and emitting EM noise/interference, thus again consuming power without > > need. > > > > Could anyone verify that power consumption is not changed considerably > > whenever SD card is in but not engaged, in comparison to whenever there > > is no SD card? > > > > On Tue, 15 Jul 2008, Jay Vaughan wrote: > >>> The problem only occurs if a SD card is set in. Doesn't matter if > >>> it's mounted or in use, it just has to sit in the socket. > >> > >> oh man, if this is true, its not good news. > >> > >> > >> > >> > >> ; > > _______________________________________________ > Openmoko community mailing list > community@lists.openmoko.org > http://lists.openmoko.org/mailman/listinfo/community _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
