[syslinux] Question: anyone seeing excessive lost characters on SYSLINUX over serial port?

Eichert, Diana deicher at sandia.gov
Mon Dec 8 05:30:50 PST 2003


This could be flow control issue, this snippet comes from the 
cyclades.c driver source,
http://gate.csl.mtu.edu/lxr/http/source/drivers/char/cyclades.c , 

"The Cyclades driver implements HW flow control as any serial driver.
The cyclades_port structure member rflow and the vector rflow_thr 
allows us to take advantage of a special feature in the CD1400 to avoid 
data loss even when the system interrupt latency is too high. These flags 
are to be used only with very special applications. Setting these flags 
requires the use of a special cable (DTR and RTS reversed). In the new 
CD1400-based boards (rev. 6.00 or later), there is no need for special 
cables."

-----Original Message-----
From: Baurjan Ismagulov
To: syslinux at zytor.com
Sent: 12/8/2003 2:36 AM
Subject: Re: [syslinux] Question: anyone seeing excessive lost characters on
SYSLINUX over serial port?

Hello, Peter!

On Fri, Dec 05, 2003 at 07:18:18PM -0800, H. Peter Anvin wrote:
> I have a user who is reporting excessive amounts of lost 
> characters when using SYSLINUX (PXELINUX actually) over a 
> serial port at 38400 bps.  What is somewhat bizarre is that 
> he has a very high quality server with a Cyclades board, and 
> yet he's losing characters in the PXELINUX->server direction.  
> Has anyone else seen this?




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