From owner-freebsd-doc  Mon Apr 30 20:48: 7 2001
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To: doc@freebsd.org
Cc: bde@freebsd.org
Subject: ddb addition review request
Date: Mon, 30 Apr 2001 21:48:04 -0600
From: Warner Losh <imp@harmony.village.org>
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Hope this is the right place for this.

Please comment on the following addition to the ddb(4) man page:

Warner

Index: ddb.4
===================================================================
RCS file: /home/imp/FreeBSD/CVS/src/share/man/man4/ddb.4,v
retrieving revision 1.12
diff -u -r1.12 ddb.4
--- ddb.4	2001/03/09 03:07:53	1.12
+++ ddb.4	2001/05/01 03:46:07
@@ -522,6 +522,16 @@
 .Sq Li :
 and modifiers as described above.
 .El
+.Sh HINTS
+If you have a machine with an ISA bus, then you can connect a pushbutton
+between A01 and B01 (CHCHK# and GND).
+Shorting thse two signals together causes an NMI, which 
+.Nm
+will catch and dump you into the debugger.
+Machines with outher buses, or other ways of generating an NMI can also
+provide a hardware solution to break into a hung machine.
+Some bridge chipsets do not actually generate a NMI on CHCHK#, so your
+milage may vary.
 .Sh SEE ALSO
 .Xr gdb 1
 .Sh HISTORY

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