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000274_news@watsun.cc.columbia.edu _Wed Feb 24 16:29:49 1999.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Subject: Re: Setserial High Speed Help
Date: 24 Feb 1999 21:08:43 GMT
Organization: Columbia University
Message-ID: <7b1por$skq$1@newsmaster.cc.columbia.edu>
To: kermit.misc@mailrelay2.cc.columbia.edu
In article <7b1our$ekh$1@vixen.cso.uiuc.edu>,
C Lance Moxley <clm@uiuc.edu> wrote:
: In comp.os.linux.hardware Frank da Cruz <fdc@watsun.cc.columbia.edu> wrote:
:
: > I don't know about setserial or your serial card, but C-Kermit 7.0
: > (currently in Beta test) supports high serial speeds in Linux in the normal
: > POSIX way, i.e. without any of the hacks found in previous releases.
:
: I'm actually using Kermit (C-Kermit 7.0.195 Beta.04, 30 Jan 1999, for Linux).
:
: Here is what happens when I try to go to 230400bps:
:
: (/home/clm/) C-Kermit>set speed 230400
: ?SET SPEED fails, speed is 110
:
: It says that it is compiled to go to 460800:
:
: (/home/clm/) C-Kermit>set speed ? Transmission rate for /dev/cua2 in bits
: per second, one of the following:
: 110 1200 150 19200 230400 300 460800 50 600 9600
: 115200 134.5 1800 200 2400 38400 4800 57600 75
:
: When I drop to 115200 it works fine.
:
The problem there is that, although the API for setting the speed to 230400
is legal, the driver for the particular device does not accept that speed,
or it accepts it but misinterprets it; the failure message comes when, after
attempting to set the speed as requested, it reads it back and the result
does not match.
So... Which kernel do you have? Which distribution and version? What kind
of serial port is cua2? Does its driver support speeds in excess of 115200?
I suspect it doesn't (or if it does, that it does so through nonstandard APIs).
- Frank