Michael <bet...@evil.elkcloner.org> writes: > can somebody please explain me the differents of these > > - echo 0 >/sys/bus/platform/devices/neo1973-pm-gsm.0/power_on
This depends on kernel version and on GTA0x revision. On all public GTA02 revisions it cuts the power to the modem, but see below. > - s3c24xx-gpio b7=0 This is usually does nothing interesting. The thing is that MODEM_ON is literally a push-button for turning on the modem when it's already powered. So after you physically connect power to the modem you has to set MODEM_ON to 1, wait for like 0.5 sec, then you should set it back to 0 (deprees push-button). That was abused by the kernel up until now, because it set it to 1 on powering and kept it until powering off. You can also wonder about modem reset line, but it's not connected on GTA02 anyway, so this has no effect. As to physically powering the modem, it depends on GPIO2 PMU (PCF50633) output, when it is set to 0, the power to the modem is cut. One funny thing also worth mentioning. Before powering off the modem one needs to change to input the GPIOs connected to the modem, or else it will drain some considerable amount of power through that. So if you want to do it yourself (and you need to if you don't use andy-tracking 8df75a337131d835d4dd8509696d684e4fa8970e or later), then use gpio utility to set H1 and H2 to input. > - echo "a...@poff" >/dev/ttySAC0 This is supposed to ask modem firmware to power off itself. Was necessary because GTA01 has no physical power switch. I don't know exact results of this command though. -- Be free, use free (http://www.gnu.org/philosophy/free-sw.html) software! mailto:fercer...@gmail.com _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
