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Date:      Fri, 27 Oct 2000 11:24:21 -0700 (PDT)
From:      Matt Dillon <dillon@earth.backplane.com>
To:        John Baldwin <jhb@FreeBSD.org>
Cc:        hackers@FreeBSD.org, "freebsd-stable@FreeBSD.ORG" <freebsd-stable@FreeBSD.org>
Subject:   Re: RE: Really odd "BTX halted" problem booting FreeBSD on VALinux h
Message-ID:  <200010271824.e9RIOLw06173@earth.backplane.com>
References:   <XFMail.001027103723.jhb@FreeBSD.org>

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:> 
:>     I was testing the PXE stuff and booting one of the boxes regularly.  
:>     All of a sudden every time I reboot I get:
:> 
:> ...
:> BIOS drive A: is disk0
:> 
:> int=00000000 err=00000000 efl=00030246 eip=00001d29
:> eax=00000000 ebs=00000390 ecx=00000000 edx=00000000
:> esi=00008db7 edi=00001c09 ebp=00000398 esp=0000038c
:> cs=c800 ds=0040 es=8db7 fs=0000 gs=0000 ss=8db7
:> cs:eip= f7 f1 33 d2 8a 4e f6 f7-f1 3d ff 03 76 03 b8 ff
:> ss:esp= 00 00 3f 00 00 00 00 00-00 00 02 00 22 0a 00 c8
:> BTX halted
:
:Int 00 is a divide by zero fault.  Note that %eax is zero.
:Do you have dangerously dedicated mode on by chance?  Some
:SCSI BIOS's _will_ crash with this if you use dangerously
:dedicated mode.
:
:-- 
:
:John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/

    Yup.

    The real question is:  Ok, so if I can't use dangerously dedicated
    mode, then how do I create a disklabel on a normal partition?  Everything
    I try using fdisk and disklabel fails.  fdisk will create a normal 
    freebsd-dedicated dos partition, but disklabel refuses to label it.

    Beyond that, our 'dangerously dedicated' disk label should at least
    contain reasonable values -- be correct enough to pass BIOS muster.
    I don't know enough about the partition format to know where the
    BIOS calculation is failing.

						-Matt



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