From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp.fulcrummicro.com (smtp.fulcrummicro.com [66.59.247.212]) by ozlabs.org (Postfix) with ESMTP id 0EB7BDDE02 for ; Sun, 30 Mar 2008 12:30:57 +1000 (EST) Received: from [192.168.4.42] (rrcs-64-183-149-178.west.biz.rr.com [64.183.149.178]) by smtp.fulcrummicro.com (Postfix) with ESMTP id E4007548358 for ; Sat, 29 Mar 2008 19:30:56 -0700 (PDT) Message-ID: <47EEFB5B.3050700@fulcrummicro.com> Date: Sat, 29 Mar 2008 19:30:51 -0700 From: Dan Wilson MIME-Version: 1.0 To: linuxppc-embedded@ozlabs.org Subject: 8543 console baud rate change problem Content-Type: text/plain; charset=ISO-8859-1; format=flowed List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , We are using ELDK 4.1, linux kernel 2.6.22 on an 8543 board with a Layer 2 switch on it (i.e., the actual packet switching is done in an external chip, not by the 8543 itself). One of our customers has encountered a strange issue with system console baud rate changes. The system console is connected to a UART port on the 8543. Here is the sequence of events: + powercycle unit at 115200 + have ping session going + establish telnet session + have L2 traffic traversing the switch + switch baud rate to any other baud rate beside 38400 + hit a few returns + switch baud rate back to 115200 and no problem + switch baud rate to 38400 + type a few char + switch baud rate back to 115200 + console is not responsive + existing ping session is still going + L2 traffic is still OK + telnet session disconnected and can not reconnect; telnet session is being served by linux ip stack + Had to power cycle to get everything back Thanks! Dan