Date: Fri, 27 Oct 2000 02:14:05 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: Mike Smith <msmith@mass.osd.bsdi.com> Cc: freebsd-stable@freebsd.org, hackers@freebsd.org Subject: Re: Really odd "BTX halted" problem booting FreeBSD on VALinux hardware Message-ID: <200010270914.e9R9E5Y03182@earth.backplane.com> References: <200010270826.e9R8QWF01184@mass.osd.bsdi.com>
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:>
:> :I'm just curious. How many disks are in this box? We saw something
:> :similar here at work and it turned out that there were multiple disklabels
:> :on the other disks and for somereason it was confusing the loader.
:> :We dd'd the bad sections off and everything worked.
:
:Are you sure it's confusing the loader? Matt's fault address puts it in
:the BIOS at 0xc800, which is probably the SCSI adapter's BIOS...>
I'm confusing something. If I clear the disk by dd'ing it, the machine
boots (diskless) fine.
If I do this:
dd if=/dev/zero of=/dev/da0 bs=32k count=4
dd if=/dev/zero of=/dev/da1 bs=32k count=4
disklabel -w -r da0 auto
disklabel -w -r da1 auto
reboot
The machine will boot diskless just fine. fdisk reports:
Information from DOS bootblock is:
The data for partition 1 is:
<UNUSED>
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
sysid 165,(FreeBSD/NetBSD/386BSD)
start 63, size 143363997 (70001 Meg), flag 80 (active)
beg: cyl 0/ sector 1/ head 1;
end: cyl 731/ sector 63/ head 254
*****************************************************
If I install boot blocks it seems to whack the partition info, and if
I reboot after this point the machine is fracked -- the boot loader blows
up in the BIOS (i.e. the BIOS blows up) trying to scan the disks.
disklabel -B da0
disklabel -B da1
fdisk da0
******* Working on device /dev/da0 *******
parameters extracted from in-core disklabel are:
cylinders=8924 heads=255 sectors/track=63 (16065 blks/cyl)
Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=8924 heads=255 sectors/track=63 (16065 blks/cyl)
Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
<UNUSED>
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
sysid 165,(FreeBSD/NetBSD/386BSD)
start 0, size 50000 (24 Meg), flag 80 (active)
beg: cyl 0/ sector 1/ head 0;
end: cyl 1023/ sector 63/ head 255
reboot...
BEWM!!!!!!!
*****************************************************
HEEELP! Why is the simple installation of boot blocks by disklabel
screwing up the partition table?
-Matt
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