From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from web15803.mail.cnb.yahoo.com (web15803.mail.cnb.yahoo.com [202.165.102.83]) by ozlabs.org (Postfix) with SMTP id 55051687C7 for ; Mon, 28 Nov 2005 14:21:57 +1100 (EST) Message-ID: <20051128032155.18844.qmail@web15803.mail.cnb.yahoo.com> Date: Mon, 28 Nov 2005 11:21:55 +0800 (CST) From: Sam Song To: linuxppc-embedded@ozlabs.org MIME-Version: 1.0 Content-Type: text/plain; charset=gb2312 Subject: 8248 Reboot Puzzle List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hi all, I met a reboot puzzle those days. Nearly every boards of 20 samples had a symptom that after issuing a reboot command in Linux land more than 10 times or so, the target would encounter some unexpections like hang after kernel uncompresing or reset the target when initializing USB[VT6212L] 1.1 host controller. But I never see any problem if cycle power. Then I have to switch for a replacement method. In 8248 restart function, use a GPIO to pull LOW POWER_RESET# to get a similar result and it did solve the problem. Well, if I use the GPIO to pull LOW HARD_RESET#, problems still existed. I use 2.4.31 kernel. So I wonder what the problem could be according to your experience. Can we get the same result with software as POWER_RESET does? I also want to know more on the difference among software reboot and Power On reset and Hard reset. I mean the possibble effect on target running or initialization. What I wanna to implement is a software power off and on operation. Power-on -> waitting for power button pushing in u-boot -> boot the target -> power off the target in Linux land by pushing the power button -> back to u-boot in a software power off state for next power button pressing -> ... Thanks in advance for any comments/suggestion, Sam ___________________________________________________________ 雅虎免费G邮箱－中国第一绝无垃圾邮件骚扰超大邮箱 http://cn.mail.yahoo.com