From owner-freebsd-doc  Mon Apr 30 23:53:29 2001
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To: Bruce Evans <bde@zeta.org.au>
Subject: Re: ddb addition review request 
Cc: doc@freebsd.org
In-reply-to: Your message of "Tue, 01 May 2001 15:45:51 +1000."
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References: <Pine.BSF.4.21.0105011531140.32403-100000@besplex.bde.org>  
Date: Tue, 01 May 2001 00:53:22 -0600
From: Warner Losh <imp@harmony.village.org>
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Based on your comments, and Dima's, I've reworked it a little:

.Sh HINTS
On machines with an ISA expansion bus, a simple NMI generation card can be
constructed by connecting a push button between the A01 and B01 (CHCHK# and
GND) card fingers.
Momentarily shorting these two fingers together may cause the bridge chipset to
generate an NMI, which causes the kernel to pass control to
.Nm .
Some bridge chipsets do not generate a NMI on CHCHK#, so your mileage may vary.
The NMI allows one to break into the debugger on a wedged machine to
diagnose problems.
Other busses bridge chipsets may be able to generate NMI using bus specific
methods.

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