Hello list,
Is there a nullconsole in BSD, similar to the nullconsole in FreeBSD?
I have a WRAP box where I need to use the serial port to interface an
external device. I don't want the default console on the serial port,
because any kernel console messages would disturb the communication.
the WRAP, "set tty pc0" in /etc/boot.conf still uses the serial
port. This might be due to some BIS setting, but I'd rather not
change that as re-setting the BIS seems to be non-trivial.
What I'm looking for is a "set tty none" or similar in /etc/boot.conf.
Any ideas?
I'll go ahead and implement it myself.
TIA
Martin Hedenfalk

1/17/07, Martin Hedenfalk <martin.hedenfalk (AT) gmail (DOT) comwrote:
Hello list,

Is there a nullconsole in BSD, similar to the nullconsole in FreeBSD?

I have a WRAP box where I need to use the serial port to interface an
external device. I don't want the default console on the serial port,
because any kernel console messages would disturb the communication.

Comment out the line in "/etc/syslog.conf" that sends stuff to
"/dev/console". my 4.0-current box that isthe default BTW

# Uncomment this line to send "important" messages to the system
# console: be aware that this could create lots of output.
err;auth.notice;authpriv.none;kern.debug;mail.crit /dev/console

==Adriaan==

1/17/07, Martin Hedenfalk <martin.hedenfalk (AT) gmail (DOT) comwrote:
Hello list,

Is there a nullconsole in BSD, similar to the nullconsole in FreeBSD?

I have a WRAP box where I need to use the serial port to interface an
external device. I don't want the default console on the serial port,
because any kernel console messages would disturb the communication.

Comment out the line in "/etc/syslog.conf" that sends stuff to
"/dev/console". my 4.0-current box that isthe default BTW

# Uncomment this line to send "important" messages to the system
# console: be aware that this could create lots of output.
err;auth.notice;authpriv.none;kern.debug;mail.crit /dev/console

==Adriaan==

Wednesday 17 January 2007 17:15, Martin Hedenfalk wrote:
Is there a nullconsole in BSD, similar to the nullconsole in FreeBSD?

Not that I know but you could always set it to a non-existant tty (com1?), I
guess.
But that's not the problem here though

the WRAP, "set tty pc0" in /etc/boot.conf still uses the serial
port. This might be due to some BIS setting, but I'd rather not
change that as re-setting the BIS seems to be non-trivial.

This sounds like the BIS is redirecting vga to the serial port and if that is
the case the only way to use the serial port is to disable the console
redirection in BIS.

What I'm looking for is a "set tty none" or similar in /etc/boot.conf.
If the WRAP is using console redirection this wont help.

Lars Hansson

1/17/07, Lars Hansson <lars (AT) unet (DOT) net.phwrote:
Wednesday 17 January 2007 17:15, Martin Hedenfalk wrote:
Is there a nullconsole in BSD, similar to the nullconsole in FreeBSD?

Not that I know but you could always set it to a non-existant tty (com1?), I
guess.
But that's not the problem here though

I've tried it, and "set tty com1" didn't work. Not sure exactly what
happened but it didn't boot properly anyway.

the WRAP, "set tty pc0" in /etc/boot.conf still uses the serial
port. This might be due to some BIS setting, but I'd rather not
change that as re-setting the BIS seems to be non-trivial.

This sounds like the BIS is redirecting vga to the serial port and if that is
the case the only way to use the serial port is to disable the console
redirection in BIS.
--
What I'm looking for is a "set tty none" or similar in /etc/boot.conf.
If the WRAP is using console redirection this wont help.

If it was possible to set the default console to "nullconsole", ie
discarding all console I/, what other part of the system would write
(directly) to pc0?

-martin

Wed, Jan 17, 2007 at 06:32:33PM +0800, Lars Hansson wrote:
Wednesday 17 January 2007 17:15, Martin Hedenfalk wrote:
Is there a nullconsole in BSD, similar to the nullconsole in FreeBSD?

Not that I know but you could always set it to a non-existant tty
(com1?), I guess. But that's not the problem here though

the WRAP, "set tty pc0" in /etc/boot.conf still uses the serial
port. This might be due to some BIS setting, but I'd rather not
change that as re-setting the BIS seems to be non-trivial.

This sounds like the BIS is redirecting vga to the serial port and if
that is the case the only way to use the serial port is to disable the
console redirection in BIS.

What I'm looking for is a "set tty none" or similar in /etc/boot.conf.
If the WRAP is using console redirection this wont help.

Why not? If you set the system console device to some non-existent com1,
as you state above, and disable most everything in /etc/ttys, wouldn't
you be able to make sure the system doesn't use the vga port?

Joachim

Wednesday 17 January 2007 19:39, Martin Hedenfalk wrote:
If it was possible to set the default console to "nullconsole", ie
discarding all console I/, what other part of the system would write
(directly) to pc0?

The BIS messages that appear before the S or bootloader is even running.

Lars Hansson

Wednesday 17 January 2007 19:47, Joachim Schipper wrote:
Why not? If you set the system console device to some non-existent com1,
as you state above, and disable most everything in /etc/ttys, wouldn't
you be able to make sure the system doesn't use the vga port?

I wa thinking of the messages that the BIS itself usuallt outputs and that
those would interfere with whatever device is connected.
setting tty to com1 apparently doesn't work either.

Lars Hansson

1/17/07, Joachim Schipper <j.schipper (AT) math (DOT) uu.nlwrote:
Wed, Jan 17, 2007 at 06:32:33PM +0800, Lars Hansson wrote:
If the WRAP is using console redirection this wont help.

there is no such thing, as wrap is headless anyway.

Why not? If you set the system console device to some non-existent com1,
as you state above, and disable most everything in /etc/ttys, wouldn't
you be able to make sure the system doesn't use the vga port?

Joachim
--

there is no vga port on the wrap

http://www.pcengines.ch

1/17/07, Lars Hansson <lars (AT) unet (DOT) net.phwrote:
Wednesday 17 January 2007 19:39, Martin Hedenfalk wrote:
If it was possible to set the default console to "nullconsole", ie
discarding all console I/, what other part of the system would write
(directly) to pc0?

The BIS messages that appear before the S or bootloader is even running.

Sure, but that output would be acceptable.

I'll implement a nullconsole and post a patch to tech@.

-martin

10:15 Wed 17 Jan , Martin Hedenfalk wrote:
Hello list,

Is there a nullconsole in BSD, similar to the nullconsole in FreeBSD?

in /usr/src/sys/kern/subr_prf.c

in printf function:
-- retval = kprintf(fmt, TCNS | TLG, NULL, NULL, ap);
++ retval = kprintf(fmt, TLG, NULL, NULL, ap);

and recompile it.

I don't know if this is a good thingbut for now i use it :)

fabioFVZ

CN 2007 :)