From owner-freebsd-hackers@FreeBSD.ORG  Fri Aug  3 09:45:58 2012
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Date: Fri, 03 Aug 2012 12:45:49 +0300
From: Daniel Braniss <danny@cs.huji.ac.il>
Message-ID: <E1SxES5-000LNc-Dz@kabab.cs.huji.ac.il>
Subject: 9.1-PRERELEASE and entering kdb weirdness
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Hi,
with 8,x an previous, I compile kernel with
	options 	KDB
	options 	DDB

	options 	ALT_BREAK_TO_DEBUGGER

and so hitting control+alt+escape would enter the debugger on the console,
or CR ~ ^b on the serial console.

the same config on 9.1, only if 
	sysctl debug.kdb.break_to_debugger=1
which allows BREAK on the serial, the control+alt+escape works on the console.

from NOTES:
# Options for serial drivers that support consoles:
options 	BREAK_TO_DEBUGGER	# A BREAK on a serial console goes to
					# ddb, if available.

can someone clarify?

cheers,
	danny