linux-mips
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Re: about serial console problem

To: Barry Wu <wqb123@yahoo.com>
Subject: Re: about serial console problem
From: Marc Karasek <marc_karasek@ivivity.com>
Date: 23 Jul 2001 10:29:20 -0400
Cc: linux-mips@oss.sgi.com
In-reply-to: <20010723065125.26642.qmail@web13905.mail.yahoo.com>
References: <20010723065125.26642.qmail@web13905.mail.yahoo.com>
Sender: owner-linux-mips@oss.sgi.com
This sounds like a problem I ran into on another processor/platform.
What are you using for a ramdisk?  Is it busybox?  There was a bug in
0.51 busybox that would not let it accept input from a console on a
serial port.  It had to do with the init for the serial port.  You can
check the patch file below to see the problem that was in busybox...

--- init.c.orig Sat Apr 21 17:46:57 2001
+++ init.c      Sat Apr 21 17:46:31 2001
@@ -276,7 +276,7 @@

        /* Make it be sane */
        tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
-       tty.c_cflag |= HUPCL|CLOCAL;
+       tty.c_cflag |= CREAD|HUPCL|CLOCAL;

        /* input modes */
        tty.c_iflag = ICRNL | IXON | IXOFF;

On 22 Jul 2001 23:51:25 -0700, Barry Wu wrote:
> 
> Hi, all,
> 
> I am porting linux 2.4.3 to our mipsel evaluation
> board. Now I meet a problem. Because I use edown
> to download the linux kernel to evaluation board.
> I update the serial baud rate to 115200.
> I use serial 0 as our console, and I can use
> printk to print debug messages on serial port.
> But after kernel call /sbin/init, I can not
> see "INIT ...  ..." messages on serial port.
> I suppose perhaps I make some mistakes. But when
> I use 2.2.12 kernel, it ok.
> If someone knows, please help me. Thanks!
> 
> Barry
> 
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--
/*************************
Marc Karasek
Sr. Firmware Engineer
iVivity Inc.
marc_karasek@ivivity.com
(770) 986-8925
(770) 986-8926 Fax
*************************/


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