Date: Wed, 7 Feb 2001 03:16:37 -0800 From: Paul Saab <paul@mu.org> To: Danny Braniss <danny@cs.huji.ac.il> 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: <20010207031637.A32676@elvis.mu.org> In-Reply-To: <E14N95Z-0004Zw-00@cs.huji.ac.il>; from danny@cs.huji.ac.il on Mon, Jan 29, 2001 at 09:51:01AM %2B0200 References: <E14N95Z-0004Zw-00@cs.huji.ac.il>
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It its the bios disk probe that is causing the machine to fault. I suppose you really dont need to probe the disks when you are netbooting. Danny Braniss (danny@cs.huji.ac.il) wrote: > im now being bitten by this one, but with a twist: > on a compaq deskpro workstation it's ok > on a dell-precision 420, it bombs. > both bioses are configured to boot via the network/pxe. > > im using the same disks for both boxes. > > i labeled the disks with: > dd if=/dev/zero of=/dev/rda0 bs=1k count=1 > disklabel -Brw da0 auto > > i then went ahead an played with vinum, all went fine on the Compaq, > i then wanted to do some comparisons, so i hooked up the disks to the Dell > and now BTX bombs. > > is there a way, that when booting from the net, btx ignores the mbr/fdisk info? > > danny > ps: im looking into the btx stuff, but will take me some time to remeber > assembler :-) > > In message <XFMail.001027190203.jhb@FreeBSD.org>you write: > } > }On 28-Oct-00 Matt Dillon wrote: > }>:> # optional dd if you are paranoid > }>:> # dd if=/dev/zero of=/dev/da0 bs=32k count=4 > }>:> fdisk -I da0 > }>:> disklabel -w -r da0s1 auto > }>:> > }>:> That's much preferable to having to use sysinstall if all you want to > }>:> do is initialize a label on a slice. > }>: > }>:Yes, this is definitely the desired behavior. > }>: > }>:-- > }>: > }>:John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ > }> > }> John, can you explain how the MBR bootstraps a slice? Should I make > }> disklabel zero-out the fdisk partition table area in the slice rather > }> then installing the dummy fdisk partition table? That is, for the > }> case where -B is used on a slice (da0s1) verses on the whole-disk (da0)? > } > }Just ignore the slice table within a slice. It is only used when boot1 > }is splatted over top of the MBR for the dangerously dedicated mode. It is > }unused and ignored otherwise. > } > }> -Matt > } > }-- > } > }John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ > }PGP Key: http://www.baldwin.cx/~john/pgpkey.asc > }"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message -- Paul Saab Technical Yahoo paul@mu.org - ps@yahoo-inc.com - ps@freebsd.org Do You .. uhh .. Yahoo!? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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