From owner-freebsd-doc Mon Apr 30 21:54: 4 2001 Delivered-To: freebsd-doc@freebsd.org Received: from bazooka.unixfreak.org (bazooka.unixfreak.org [63.198.170.138]) by hub.freebsd.org (Postfix) with ESMTP id E705637B424; Mon, 30 Apr 2001 21:54:02 -0700 (PDT) (envelope-from dima@unixfreak.org) Received: from hornet.unixfreak.org (hornet [63.198.170.140]) by bazooka.unixfreak.org (Postfix) with ESMTP id 5C8B73E28; Mon, 30 Apr 2001 21:54:02 -0700 (PDT) To: Warner Losh Cc: doc@freebsd.org, bde@freebsd.org Subject: Re: ddb addition review request In-Reply-To: <200105010348.f413m4R56040@harmony.village.org>; from imp@harmony.village.org on "Mon, 30 Apr 2001 21:48:04 -0600" Date: Mon, 30 Apr 2001 21:54:02 -0700 From: Dima Dorfman Message-Id: <20010501045402.5C8B73E28@bazooka.unixfreak.org> Sender: owner-freebsd-doc@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Warner Losh writes: > --- 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 ^^^^ <-- these? > +.Nm > +will catch and dump you into the debugger. > +Machines with outher buses, or other ways of generating an NMI can also ^^^^^^^ <-- intentional? > +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. Other than that, looks good. Dima Dorfman dima@unixfreak.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-doc" in the body of the message