From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bay0-omc2-s23.bay0.hotmail.com (bay0-omc2-s23.bay0.hotmail.com [65.54.246.159]) by ozlabs.org (Postfix) with ESMTP id 16E26DDEEF for ; Wed, 13 Aug 2008 12:36:42 +1000 (EST) Message-ID: Content-Type: multipart/alternative; boundary="_d8107e38-3b1d-4432-807f-0f6d23042575_" From: =?gb2312?B?1uzA+7Tv?= To: Subject: serial problem of cpm2 Date: Wed, 13 Aug 2008 10:36:41 +0800 MIME-Version: 1.0 List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --_d8107e38-3b1d-4432-807f-0f6d23042575_ Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: 8bit hi everybody: These days a problem drive me to read the code about mpc8247 cpm2 smc or scc uart.The problem is that, very very occasionally when my system bring up, I find the serial port can not work. The serial port connects with smc1 and is a console port. when the problem occured, the tx of smc1 is still ok. I send 'break' to the port, and dump the register of smc . The indicators of 'break' len and 'break' times show it reciverd thesignal. Catting /proc/interrupts I find the interrupts counter do not increase.It seemed the irq of smc disabled by systerm. Somehow, when the problem occured, there were a lot of 'break' signal recived the serial port, maybe this is hardware mistake.And the mistake lead the problem. Do anyone troubled with these problem? _________________________________________________________________ 用手机MSN聊天写邮件看空间，无限沟通，分享精彩！ http://mobile.msn.com.cn/ --_d8107e38-3b1d-4432-807f-0f6d23042575_ Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: 8bit hi everybody:
  These days a problem drive me to read the code about mpc8247 cpm2 smc or scc uart.
The problem is that, very very occasionally when my system bring up, I find the serial
port can not work. The serial port connects with smc1 and is a console port. when the
problem occured, the tx of smc1 is still ok. I send 'break' to the port, and dump the
register of smc . The indicators of 'break' len and 'break' times show it reciverd the
signal. Catting /proc/interrupts I find the interrupts counter do not increase.
It seemed the irq of smc disabled by systerm. Somehow, when the problem occured, there
were a lot of 'break' signal recived the serial port, maybe this is hardware mistake.
And the mistake lead the problem.
       Do anyone troubled with these problem?

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