[Gta04-owner] Modem closes serial line after active calls (sometimes)

Neil Jerram neil at ossau.homelinux.net
Thu May 3 13:16:12 CEST 2012

Simon Busch <morphis at gravedo.de> writes:

> On 29.04.2012 15:56, Radek Polak wrote:
>> On Saturday 28 April 2012 12:44:10 Simon Busch wrote:
>>> As far as I got the details from that thread there is no clean solution
>>> for the disconnecting modem just a workaround as Radek implemented it
>>> for qtmoko, right?
>> Yup, i found no clean solution. Currently i switch to 2G on modem 
>> initialization - this seems to help + after 30s of unsuccessful reads i 
>> restart whole QtMoko + some other hacks:
> Yeah, 2G seems to solve the problem. I tried with limiting the radio
> access to 2G only and never got a disconnect from the modem.
> Disabling 3G generally for the GTA04 is nothing we really want. So I am
> thinking about just limiting the radio access to 2G when dealing with
> calls. When a call is incoming or outgoing we have to switch the radio
> access to 2G and switch it back to ANY when we're done with call
> handling. Let's see if this works not just in theory ...

Nice idea!

In parallel, though, I believe Nikolaus was going to look into the
possibilities for modem firmware upgrade.  Nikolaus, is there any news
on that?


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