linux-kernel - Re: Handshaking on USB serial devices

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Date:	Thu, 14 Feb 2008 12:55:21 -0500
From:	Gene Heskett <gene.heskett@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	David Newall <davidn@...idnewall.com>, Greg KH <greg@...ah.com>,
	linux-usb@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Handshaking on USB serial devices

On Thursday 14 February 2008, Alan Cox wrote:
>O> believe at several second intervals.  I can cut those messages to about
>
>> weekly by using an FDTI adaptor in its place, or I can stop them entirely
>> if
>
>Sorry don't see the connection between the two stories ?
>
>Alan

The connection is that windows people don't see those errors, linux folks do. 
I believe, but don't know how to use the tools to verify it, that the first 
byte of a packet is being thrown away about .1% of the time for the pl2303, 
but I'm not sure if the FTDI driver still suffers from a similar rash.  I 
have only one such FTDI adapter in the system atm, and its in series with 
manual heyu commands only, so it doesn't get regularly exercised.  I figure 
it will do the least damage there.  The pl2303's are all hanging on a peg 
waiting for emergency use only, they were just too much trouble when they 
miss-fire and the system issues -wall warnings several times per hour.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
The revolution will not be televised.
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