On Wed, 28 Jun 2006, User Freebsd wrote:
On Wed, 28 Jun 2006, Robert Watson wrote:
On Wed, 28 Jun 2006, User Freebsd wrote:
'k, now that I'm up to 3 6-STABLE servers that are deadlocking, I'm
spending time with the remote tech today to get a serial console put
online ... how do I drop into DDB remotely, where the serial console is
going through a Portmaster Terminal server? issuing CTL-ALT-ESC, I doubt,
will work, will it?
If configured to use a serial console (console="comconsole" in
loader.conf), you can enter the debugger with BREAK_TO_DEBUGGER in the
kernel config by sending a serial break. With my portmasters, I telnet to
a TCP port to connect to the serial console, so I send a telnet break,
using ^]send break.
Have you ever had a problem with this warning: "(useful for remote
diagnostics, but also dangerous if you generate a spurious BREAK on the
serial port!)" in the handbook?
Yes. It's unusual, but once in a while I get a nervous serial port. If you
experience this, type "Cont" to continue, and then recompile your kernel with
ALT_BREAK_TO_DEBUGGER but without BREAK_TO_DEBUGGER. Here's the notes entry:
# Solaris implements a new BREAK which is initiated by a character
# sequence CR ~ ^b which is similar to a familiar pattern used on
# Sun servers by the Remote Console.
options ALT_BREAK_TO_DEBUGGER
I've not had problem a problem on any recent hardware except for my soekris.
Robert N M Watson
Computer Laboratory
University of Cambridge
_______________________________________________
freebsd-stable@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-stable
To unsubscribe, send any mail to "[EMAIL PROTECTED]"
