Date: Mon, 12 Feb 2001 22:11:40 +0100 From: Francesco Casadei <fcasadei@inwind.it> To: Danny Braniss <danny@cs.huji.ac.il> Cc: Paul Saab <paul@mu.org>, John Baldwin <jhb@FreeBSD.org>, Terry Lambert <tlambert@primenet.com>, freebsd-stable@FreeBSD.org, hackers@FreeBSD.org Subject: Re: Really odd "BTX halted" problem booting - PXE/diskless Message-ID: <20010212221140.B413@junior.kasby> In-Reply-To: <E14RAYf-0004Tu-00@cs.huji.ac.il>; from danny@cs.huji.ac.il on Fri, Feb 09, 2001 at 12:13:40PM %2B0200 References: <E14RAYf-0004Tu-00@cs.huji.ac.il>
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On Fri, Feb 09, 2001 at 12:13:40PM +0200, Danny Braniss wrote: > In message <20010207031637.A32676@elvis.mu.org>you write: > }It its the bios disk probe that is causing the machine to fault. > > I can now confirm that it's a divide by zero in the Adaptec BIOS GRRRRRR. > (in biosdisk, when 'probing' the adaptec) and it happens on a AIC 7899, but > works ok on some other ADAPTECs. > > the problem is nasty because it's not easy to zero out the first block of the > disk if you can't get the os working :-) > > }I suppose you really dont need to probe the disks when you are netbooting. > > i got the pxeboot not to check the disks but then the kernel stepped on it :-( > > is there a way to prevent BTX to halt if the 'caller' expects a div/zero? > > (in the days of the PDP/11 i could trap such things, print a message, and > continue). > > danny > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message > > end of the original message I had this problem a couple of days ago with an Adaptec AHA-2940UW SCSI controller and an IBM DDRS-34560W SCSI disk. I created one large slice in dangerously dedicated mode and I wasn't able to boot anymore: I got "BTX halted" and the registers dump. I low-level formatted the disk using the controller BIOS, recreated the slice (this time in coperative mode!) and everything worked! Francesco Casadei P.S. The DDRS-34560W uses part of the buffer for the firmware so I could safely low-level format the disk. Check if you can low-level format your disk without destroying it! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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