Date: Mon, 30 Apr 2001 21:48:04 -0600 From: Warner Losh <imp@harmony.village.org> To: doc@freebsd.org Cc: bde@freebsd.org Subject: ddb addition review request Message-ID: <200105010348.f413m4R56040@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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-doc" in the body of the message
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