02-12-2002
You mentioned the keyboard is plugged into the monitor - Do you mean a dumb terminal? Is the 'monitor' plugged into the serial port (a or b)?
Here is the info -
The definition of a headless system is one that does not have an attached
keyboard or does not have a Sun console. It will by default send the boot
information out serial port A if the keyboard or console are not attached.
Serial port B can also be used.
Attach using NULL modem cable to:
-An ascii terminal- For example, Wyse terminal
-Another Sun workstation that has a Sun console
-A Network terminal concentrator/server
Technical Support does not recommend booting off a serial port with a
modem attached or not having any type of console.
A console allows the ability to send a break signal dropping the
system to the OK prompt for diagnostics. The console device is
/dev/console.
What needs to be configured on Solaris
--------------------------------------
A. Open Boot Prom:
OK> setenv output-device ttya
OK> setenv input-device ttya
Note: the above is not necesary on tty A if the keyboard is disconnected.
It is necessary to change these setting for serial port B regardless.
Additional settings:
ttya-rts-dtr-off=false
ttya-ignore-cd=true
Syntax for changing Open Boot Prom value:
OK> setenv ttya-rts-dtr-off false
OK> setenv ttya-ignore-cd true
Use printenv to verify the following settings:
ttya-mode=9600,8,n,1,-
To change:
OK> setenv ttya-mode 9600,8,n,1,-
Run the "reset" command to make the above settings take effect
OK> reset
B. The terminal type, /etc/inittab and port monitors
Do not start port monitor services for the serial port. Verify with pmadm -l.
Make sure there are no listings for the tty port that is acting as the
console. (Solaris 2.5 ttya and ttyb have port monitor services enabled for
modem logins by default- These services need to be removed)
To remove type:
pmadm -p zsmon -r -s <SVCTAG>
SVCTAG will be ttya or ttyb.
/etc/inittab takes care of setting the console port characteristics
with the following line:
co:234:respawn:/usr/lib/saf/ttymon -g -h -p "`uname -n` console login: "
-T sun -d /dev/console -l console -m ldterm,ttcompat
By default the console terminal type is "sun" specified with the
-T option above. This means that for ascii terminals vi will not work.
Inorder for programs like vi to work the TERM variable needs to be
changed to match the "personality" of the terminal.
This can be done by modifing -T in /etc/initab to 'wyse30' (for example)
or changing the TERM variable in .login, .profile, or .cshrc or at
the command line, for example:
setenv TERM wyse30
C. Sending a Break Signal
Unpluging the serial cable is the equivalent to sending a break
and will bring the Sun box down to the OK prompt. If the cable was
not attached during bootup plugging it in may send a break. When
a Network Terminal Server is rebooted this will also send a break
and bring the Sun boxes down to the OK prompt.
What needs to be configured on the terminal
-------------------------------------------
Ascii terminals have a setup mode. For the wys30 <shift><setup> keys
will bring up the terminals parameters. Use the arrow keys and
the space bar to proceed thru the settings.
settings: 8 data bits, no parity, 1 stop bit (8, none, 1)
baud: Use 9600!
personality (modes) : vt100, wyse60, etc needs to match the Solaris
TERM variable
Related SRDB's
--------------
SRDB ID: 13758
SYNOPSIS: Headless 4.x connected to Network Terminal Server displays garbage until login.
INFODOC ID: 13760
SYNOPSIS: Ways to Send Break (L1-A) to remotely logged into serial console device.
INFODOC ID: 14672
SYNOPSIS: Solaris 2.4/2.5 Modem configuration
INFODOC ID: 13766
SYNOPSIS: Warning - ttymon cannot allocate controlling tty on /dev/console,
INFODOC ID: 13724
SYNOPSIS: Allowing root logins over modem lines in /etc/ttytab
Also:
OpenBoot Command Reference Manual
A. Setting Up a TIP connection
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iscc(7) Miscellaneous Information Manual iscc(7)
NAME
iscc - serial communications interface
SYNOPSIS
controller iscc0 at isa0
DESCRIPTION
An onboard Zilog 8530 DUART provides AXPvme-based Single Board Computers with console (CON) and auxiliary (AUX) serial communications
ports. Both serial communications ports can operate at baud rates from B50 to B38400, excluding B134 (see tty(7)).
On AXPvme Single Board Computers configured with a graphics head as the system console, the CON serial communications port (/dev/tty01) is
available for use by application programs as an additional communications port.
In the absence of a graphics head, the CON serial communications port (/dev/console) becomes the system console. When used as the serial
system console, the CON serial communications port always operates at 9600 BPS, 8-bits, and no parity.
Regardless of system console, the AUX serial communications port (/dev/tty00) is always available for use by application programs.
RESTRICTIONS
Data communications equipment attached to the CON serial communications port must be set to 9600 BPS, 8-bits, no parity when configured as
the serial system console. The iscc terminal driver enforces this restriction.
No modem control is supported for either the CON or AUX serial communications ports.
FILES
console terminal local terminal local terminal
RELATED INFORMATION
console(7), devio(7), tty(7), MAKEDEV(8) delim off
iscc(7)