Paul Fertser wrote: > We tried to coordinate some effort at #openmoko irc channel. The guys > who have the device and abilities are: Psi, Kero and > SpeedEvil. Unfortunately, they lack time to do any serious > investigations. > Thanks Paul for the info I will keep eye for those nicknames in the list. Unfortunately I don't have access to the IRC from work and my tenable English makes me useless on any real time chat, but gives me some time to think on the problem! :) > I'm getting a gta01 soon so i very much hope i'll be able to do > something wrt power consumption (the main goal of getting a gta01 for > me). The plan is so far to physically cut (by removing 0Rs) most > consumers and analise step by step all kernel and hardware problems. > > Do not hold your breath though. > > BTW, for a start you can fix SD power control issues (due to a bad > merge the function got fubarred), if you run with SD inserted you'll > have extra ~20mA feeding card even in suspend. > Well I just looked the GTA01 schematics and SD card interface an found first design problem. ;) It can only account for ~30uA leaking from the IO_3V3 power bus to SD_3V3 power bus through R7501 and R7502 when U7501 is off. I believe we are missing blocking diode that will prevent current to flow between SD and IO power buses. (I don't remember if the simple diode can stop 30uA leak. ) Of course you are talking about ~20mA so I guess the problem is in the kernel that keeps the power to the SD card on at all time. Right? ( Signal /SD_ON coming from pin M14 on S3C2410X ).
Best regard, SAL-e _______________________________________________ devel mailing list devel@lists.openmoko.org https://lists.openmoko.org/mailman/listinfo/devel
