Super cool info! That helps a lot - I think we would have never been able to figure this out without your help.
Many many thanks! Oh... is there an AT command to query for the modem's firmware version? I assume that if the firmware is too old, there is no way to upgrade it "in the field", i.e. at my desk? Cheers nils Harald Welte schrieb: > Guys, I'll collect all the respective information and put it in a > public wiki page. > > Will let you know once that is done. > > The general idea is that the gsm modem firmware checks if the handshake > lines currently permit sending another character to the phone. If the > handshake permits it, the cpu must be alive and it proceeds sending > data. > > if the RTS/CTS handshake does not permit sending of any further > characters, the modem will assert a GPIO line (connected to an EINT > capable input of the S3C24xx). The interrupt line will remain asserted > until the S3C24xx has changed the RTS/CTS handhsake to allow the modem > to send characters again. > > So to do this, the following conditions need to be fulfilled: > > 1) a firmware post may-16-2007 needs to be present in the gsm modem > This is true for all phones bought during phase 1 in the online > shop. However, I currently don't really know what firmware version > was present in the GTA01Bv4 that we sent to phase 0. > > 2) the suspend code probably still needs to correctly configure the > RTS/CTS lines (i.e. put them in GPIO mode, and set them to their > desired "don't send any more characters" level) > > So in this case, any data from the GSM modem will wake up the cpu for > processing of that data. The GSM modem has some internal buffer (I > don't know how big right now) that should be sufficient for buffering > the data until the CPU is alive. > > This also means that gsmd will eventually have to re-program the GSM > modem to make sure only relevant unsolicited response codes are sent > during suspend. You usually don't want a signal level change to cause > a CPU wake up, only things like incoming message / call. > > As indicated, more details on the soon to be created public wiki page > > Cheers, -- kernel concepts GbR Tel: +49-271-771091-12 Sieghuetter Hauptweg 48 Fax: +49-271-771091-19 D-57072 Siegen Mob: +49-176-21024535 --
