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Question concerning the serial console

To: linux-mips@oss.sgi.com
Subject: Question concerning the serial console
From: Jeff Harrell <jharrell@telogy.com>
Date: Mon, 17 Sep 2001 14:47:31 -0600
Organization: Telogy
Sender: owner-linux-mips@oss.sgi.com
I have recently ported 2.4.2 version of the Linux kernel to a development
board that I am working on.  I have built a HHL2.0 version of the filesystem
for userland apps.  I am getting output on the serial console but when I get
to a login prompt it is not handling any keyboard input.   I have included my
/dev/console node, inittab and a snippet from the xxx_setup.c for the board
that I am running.  I thought this was all that was required.  Any help in this
area would be greatly appreciated.

Jeff

------------------------------------------------

/dev/console
crw-r--r--    1 root     tty        5,   1 Sep 17 12:47 console

---------8<------ /etc/initab --------8<-------------
# /etc/inittab: init(8) configuration.
# $Id: inittab,v 1.8 1998/05/10 10:37:50 miquels Exp $
 
# The default runlevel.
id:2:initdefault:
 
# Boot-time system configuration/initialization script.
# This is run first except when booting in emergency (-b) mode.
si::sysinit:/etc/init.d/rcS
 
# What to do in single-user mode.
~~:S:wait:/sbin/sulogin
 
# /etc/init.d executes the S and K scripts upon change
# of runlevel.
#
# Runlevel 0 is halt.
# Runlevel 1 is single-user.
# Runlevels 2-5 are multi-user.
# Runlevel 6 is reboot.
 
l0:0:wait:/etc/init.d/rc 0
l1:1:wait:/etc/init.d/rc 1
l2:2:wait:/etc/init.d/rc 2
l3:3:wait:/etc/init.d/rc 3
l4:4:wait:/etc/init.d/rc 4
l5:5:wait:/etc/init.d/rc 5
l6:6:wait:/etc/init.d/rc 6
# Normally not reached, but fallthrough in case of emergency.
z6:6:respawn:/sbin/sulogin
 
# What to do when CTRL-ALT-DEL is pressed.
ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now
 
# Action on special keypress (ALT-UpArrow).
kb::kbrequest:/bin/echo "Keyboard Request--edit /etc/inittab to let this work."
 
# What to do when the power fails/returns.
pf::powerwait:/etc/init.d/powerfail start
pn::powerfailnow:/etc/init.d/powerfail now
po::powerokwait:/etc/init.d/powerfail stop
 
# This line provides a nice out-of-box experience.  For regular use, you
# should replace it with the proper getty lines below.
 
con:2345:respawn:/sbin/getty console
 
# /sbin/getty invocations for the runlevels.
#
# The "id" field MUST be the same as the last
# characters of the device (after "tty").
#
# Format:
#  <id>:<runlevels>:<action>:<process>
#1:2345:respawn:/sbin/getty 38400 tty1
#2:23:respawn:/sbin/getty 38400 tty2
#3:23:respawn:/sbin/getty 38400 tty3
#4:23:respawn:/sbin/getty 38400 tty4
#5:23:respawn:/sbin/getty 38400 tty5
#6:23:respawn:/sbin/getty 38400 tty6
 
# Example how to put a getty on a serial line (for a terminal)
#
#T0:23:respawn:/sbin/getty -L ttyS0 9600 vt100
#T1:23:respawn:/sbin/getty -L ttyS1 9600 vt100
 
# Example how to put a getty on a modem line.
#
#T3:23:respawn:/sbin/mgetty -x0 -s 57600 ttyS3

------8<---------------8<---------------

snippet from my xxx_setup.c code....

#ifdef CONFIG_SERIAL_CONSOLE
 argptr = prom_getcmdline();
 if ((argptr = strstr(argptr, "console=ttyS0")) == NULL) {
  int i = 0;
  char *s = prom_getenv("modetty0");
  while(s[i] >= '0' && s[i] <= '9')
   i++;
  strcpy(serial_console, "ttyS0,");
  strncpy(serial_console + 6, s, i);
  prom_printf("Config serial console: %s\n", serial_console);
                //  console_setup(serial_console, NULL);
                console_setup(serial_console);
 }
#endif
 
 
 

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
\ Jeff Harrell  (jharrell@telogy.com)               \
\ Telogy Networks                                   \
\ Broadband Access Group                            \
\                                                   \
\ Work: (301) 515-6537                              \
\ Fax:  (301) 515-6637                              \
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