3 extra driver need to develop for GTA03

Joerg Reisenweber joerg at openmoko.org
Thu May 29 13:32:32 CEST 2008

Am Do  29. Mai 2008 schrieb Michael Shiloh:
> Mike (mwester) wrote:
> > andrzej zaborowski wrote:
> > ...
> >> In terms of bottlenecks I'm sure the muxer is not one, neither is the
> >> gsm module, if you want to use the usual serivces (GPRS/EDGE).  I
> >> think Harald did post some numbers from his experience in A780 project
> >> where they actually have a working kernel-side TS0710 implementation
> >> (written in a very A780 centric way unfortunately) including bit rates
> >> at which the muxer potentially starts to be the bottleneck.  Below
> >> that it's just some wasted cycles from going to userspace and back
> >> more than necessary.
> > 
> > The Linux serial driver is an abomination in itself (the only saving 
> > grace is that it's largely compatible back to the days of the ASR33 
> > teletype machine). IMO, if performance is the goal, we need to consider 
> > a custom high-speed serial driver for the UART connected to the GSM, one 
> > that gets rid of the overhead of the entire tty layer in the kernel.
> I used to own an ASR33. How would I use it with my Neo if we accept your 
> suggestion?
> :-)
> M
> p.s. it would have been quite a sight, an ASR33 connected via a Neo, 
> happily typing away with that wonderful sound only Teletypes can make...

well maybe we can start a project to abuse the headset jack and build a fancy 
adapter micbias->20mA. 20mA->HOLDbutton
;-) XD
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