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Date:      Fri, 09 Feb 2001 12:13:40 +0200
From:      Danny Braniss <danny@cs.huji.ac.il>
To:        Paul Saab <paul@mu.org>
Cc:        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:  <E14RAYf-0004Tu-00@cs.huji.ac.il>
In-Reply-To: Your message of Wed, 7 Feb 2001 03:16:37 -0800 .

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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




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