From owner-freebsd-hackers Wed May 10 16: 1:52 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from rover.village.org (rover.village.org [204.144.255.49]) by hub.freebsd.org (Postfix) with ESMTP id 4416337B969 for ; Wed, 10 May 2000 16:01:47 -0700 (PDT) (envelope-from imp@harmony.village.org) Received: from harmony.village.org (harmony.village.org [10.0.0.6]) by rover.village.org (8.9.3/8.9.3) with ESMTP id RAA55971; Wed, 10 May 2000 17:01:44 -0600 (MDT) (envelope-from imp@harmony.village.org) Received: from harmony.village.org (localhost.village.org [127.0.0.1]) by harmony.village.org (8.9.3/8.8.3) with ESMTP id RAA96028; Wed, 10 May 2000 17:01:22 -0600 (MDT) Message-Id: <200005102301.RAA96028@harmony.village.org> To: Peter Jeremy Subject: Re: Can NMI drop a hanging FreeBSD kernel into DDB? Cc: wc.bulte@chello.nl, hackers@FreeBSD.ORG In-reply-to: Your message of "Thu, 11 May 2000 08:51:22 +1000." <00May11.085127est.115442@border.alcanet.com.au> References: <00May11.085127est.115442@border.alcanet.com.au> <00May11.070143est.115219@border.alcanet.com.au> <20000510231004.A1871@jedi.wbnet> Date: Wed, 10 May 2000 17:01:22 -0600 From: Warner Losh Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message <00May11.085127est.115442@border.alcanet.com.au> Peter Jeremy writes: : Grounding IOCHK* does cause an NMI on the only PCI machine I've tried : it on. It looks like this is maskable in the Intel PIIX3 (and : presumably later) chips, so it may depend on the BIOS. All but one of my machines do that. I have a special card :-) : I don't know whether this will still work if the PCI bus is hung. I : know it doesn't work when I wedge that machine, but I'm not sure what : is wedging (since I'm not playing with untested PCI hardware, I think : it's not the PCI bus). I've had the pci bus hang when undebugged hardware was plugged into it... When the machine was in this state it was impossible to break into the debugger. I don't know what is hanging either... Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message