3G modem and USB, old & new

[Nick Hibma]

> >I've not been able to reproduce the problems reliably. But looking at
> > the symptoms somehow buffering goes pear-shaped somewhere. There is no
> > buffering being done in the u3g code.That's all handled by ucom, but to
> > me that looks like cut&paste from other code. So I presume (wildly
> > pointing fingers at code I do not yet understand) that the problem is
> > somewhere in the combination of ucom and tty layer, or perhaps even in
> > the TTY layer.
>
> I can shoot that theory down right away: It worked great when I hacked
> the magic mode bit support into ubsa.c
>
> It must be a u3g issue.

Explain that to the people that get great performance on u3g, which had big 
troubles using ubsa (the same problems you are seeing; me for one). So I am 
pretty sure I am right.

Second: I've had reports of E220 working and the same device not working and 
choking on 'AT' on the second channel. It is most definitely a buffering 
issue. Perhaps the buffers are not properly configured, but making them 
larger or smaller does not change the symptoms in any case for these 
people.

Would you know of a serial device using tty layer code with high speed 
serial links that I could look at to see what could be wrong in either u3g 
and/or ucom?

Thanks.

Nick