From owner-freebsd-stable Thu Sep 6 18:37: 6 2001 Delivered-To: freebsd-stable@freebsd.org Received: from wall.polstra.com (rtrwan160.accessone.com [206.213.115.74]) by hub.freebsd.org (Postfix) with ESMTP id 480D237B403 for ; Thu, 6 Sep 2001 18:37:04 -0700 (PDT) Received: from vashon.polstra.com (vashon.polstra.com [206.213.73.13]) by wall.polstra.com (8.11.3/8.11.3) with ESMTP id f871alg73427; Thu, 6 Sep 2001 18:36:47 -0700 (PDT) (envelope-from jdp@wall.polstra.com) Received: (from jdp@localhost) by vashon.polstra.com (8.11.6/8.11.0) id f871akT01296; Thu, 6 Sep 2001 18:36:46 -0700 (PDT) (envelope-from jdp) Date: Thu, 6 Sep 2001 18:36:46 -0700 (PDT) Message-Id: <200109070136.f871akT01296@vashon.polstra.com> To: stable@freebsd.org From: John Polstra Cc: marius@alchemy.franken.de Subject: Re: Solid hangs caused by pcm In-Reply-To: <20010907032058.A33679@alchemy.franken.de> References: <20010907032058.A33679@alchemy.franken.de> Organization: Polstra & Co., Seattle, WA Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG In article <20010907032058.A33679@alchemy.franken.de>, wrote: > > screwdriver-in-the-ISA-slot trick. We're talking hit the reset button > > here. > > uhm, a bit off-topic, but how das that trick work ? is it about triggering > an hardware interrupt? is it documented somewhere ? On most (but not all) motherboards, you can generate an NMI by shorting a certain pair of pins in an ISA connector. If you try this and fry your motherboard, don't complain to me. The pins to short together are the two ISA pins (one on each side of the slot) nearest the back of the case (where the external connectors are). Don't do this on a PCI slot. Be careful that you short the pins only to each other, and not to anything else. If it works, the NMI will drop you into ddb. John -- John Polstra jdp@polstra.com John D. Polstra & Co., Inc. Seattle, Washington USA "Disappointment is a good sign of basic intelligence." -- Chögyam Trungpa To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message