Skip site navigation (1)Skip section navigation (2)
Date:      Fri, 9 Jan 2009 22:45:15 +0100
From:      Nick Hibma <nick@van-laarhoven.org>
To:        Poul-Henning Kamp <phk@phk.freebsd.dk>
Cc:        freebsd-current@freebsd.org
Subject:   Re: 3G modem and USB, old & new
Message-ID:  <200901092245.16450.nick@van-laarhoven.org>
In-Reply-To: <23654.1231535410@critter.freebsd.dk>
References:  <23654.1231535410@critter.freebsd.dk>

next in thread | previous in thread | raw e-mail | index | archive | help
> >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



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200901092245.16450.nick>