From owner-freebsd-stable  Mon Jan 29  0:30:15 2001
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To: John Baldwin <jhb@FreeBSD.org>
Cc: Terry Lambert <tlambert@primenet.com>, paul@mu.org (Paul Saab),
	freebsd-stable@FreeBSD.org, hackers@FreeBSD.org
Subject: Re: Really odd "BTX halted" problem booting - PXE/diskless
In-reply-to: Your message of Fri, 27 Oct 2000 19:02:03 -0700 (PDT) .
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Date: Mon, 29 Jan 2001 09:51:01 +0200
From: Danny Braniss <danny@cs.huji.ac.il>
Message-Id: <E14N95Z-0004Zw-00@cs.huji.ac.il>
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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/






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