What now? How to proceed debugging this GSM/kernel problem?
roh at openmoko.org
Mon Apr 21 14:51:57 CEST 2008
Mike (mwester) wrote:
> So close. So very close...
> I've been expending much effort in fixing up the many suspend/resume
> issues that have been crippling the poor GTA01. At this point, the
> major ones are all resolved, but I've encountered a difficult one.
> So I have questions. This email is long, so for those with shorter
> attention spans I'll cut to the chase:
thanks a lot. still feeling a bit sick, so i will only answer what i
> a) Where is the list of known problems with the different GSM modem
> firmwares, and the list of fixes in each firmware?
we hace such a list at openmoko, but i dunno about the release ability,
will follow that up internally and report back.
> b) Is there a document that describes what we (or anyone else, for that
> matter) know about the problems or unexpected behavior of our version of
> the S3C2410 SoC UARTs, especially with regard to auto flow control and
> c) What are the real-world parameters for the GSM modem with regard to
> 1) How much data can it buffer internally?
> 2) What does it do when its internal buffers fill -- does it throw
> data away? Does it transmit despite being flow-controlled? Is there an
> AT command available to alter or control how it behaves? Can it report
> internal buffer overflows? What could trigger it to transmit despite
> being flow-controlled?
dunno, but good questions. sean c. should be able to answer that. ccing him.
> 3) Do different firmware versions for this modem behave differently in
> regard to flow control, and if so, how so?
> d) If I were to acquire a scope, are the CTS, RTS, and other signals
> between the GSM and the UART accessible on the debug board? Are there
> pads on the phone itself?
not on the debugboard, but on the device itself. should be labeled, but
in case you want to really do that, just holler.
> e) Can we do anything with gsmd, and/or phonekit, to work around the
> problem in the meantime?
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