From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1766009AbXG0TeB (ORCPT ); Fri, 27 Jul 2007 15:34:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762619AbXG0Tdw (ORCPT ); Fri, 27 Jul 2007 15:33:52 -0400 Received: from adsl-70-250-156-241.dsl.austtx.swbell.net ([70.250.156.241]:57241 "EHLO gw.microgate.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758338AbXG0Tdv (ORCPT ); Fri, 27 Jul 2007 15:33:51 -0400 Message-ID: <46D33636.7070200@microgate.com> Date: Mon, 27 Aug 2007 14:38:14 -0600 From: Paul Fulghum User-Agent: Thunderbird 2.0.0.0 (Windows/20070326) MIME-Version: 1.0 To: Tilman Schmidt CC: Lee Howard , Alan Cox , Robert Hancock , linux-serial@vger.kernel.org, tytso@mit.edu, rmk@arm.linux.org.uk, linux-kernel@vger.kernel.org Subject: Re: serial flow control appears broken References: <46A84B4A.6070902@shaw.ca> <46A8C6F1.4080309@howardsilvan.com> <20070726173121.70088a92@the-village.bc.nu> <46A98845.8010806@howardsilvan.com> <46A9F712.70706@imap.cc> In-Reply-To: <46A9F712.70706@imap.cc> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Tilman Schmidt wrote: > Could this be related? > > http://lkml.org/lkml/2007/7/18/245 > > Quote: > "I've recently found (using 2.6.21.4) that configuring a serial ports > (ST16654) which use the 8250 driver using setserial results in the > UART's FIFOs being disabled (unless you specify autoconfig)." That would make sense. Lee's error is a hardware FIFO overrun which could occur if the FIFO is being disabled as described in your link (by trying to set the uart type with setserial). Since the tty flow control is only triggered by the line discipline in response to ldisc buffer levels and not hardware FIFO overruns, you would never see any flow control action as reported by Lee. -- Paul Fulghum Microgate Systems, Ltd.