Date: Thu, 03 May 2001 18:52:14 -0400 From: cjm88@home.com To: stable@FreeBSD.ORG Subject: Re: Strange BTX halted error Message-ID: <3AF1E11E.13F5B110@home.com> References: <Pine.BSF.4.33.0105011046470.30516-100000@sdmail0.sd.bmarts.com> <200105011806.f41I6UN69612@earth.backplane.com> <20010502110520.B340@iv.nn.kiev.ua> <200105022114.f42LETo95078@earth.backplane.com>
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I had a similar experience... Had to use DOS fdisk utility to put a SCSI disk that had been previously entirely dedicated to FBSD (in a dangerous way :) ) to being useable again as a bootable FBSD drive. It burnt a couple of evening's worth of time since the install process doesn't complain. It let's you go throught the entire install process... everything looks good until you exit install... reboot... and poof! you get a "missing operating system" message from the BIOS. All it took to fix it was to actually use DOS fdisk to create an active partition and then format it with the /S option. Maybe this will help someone avoid the same issue. C Matt Dillon wrote: > :... > :> dangerously dedicated partitions. It's what prompted me to fix the > :> disklabel code to allow boot blocks to be installed on slices. > :> Unfortunately, the only way I could fix my particular problem was > :> to get rid of my dangerously dedicated partition which meant blowing > :> away the hard drive and repartitioning and relabeling it. > : > :If disk is `dangerously dedicated', sector 0:0:1 is occupied with boot1, > :which does not use master PT area (0x1BE-0x1FF) and even contains > :a simple fake valid PT. Did you ever try to set there something syntactically > :valid for your BIOS and enough to allow loading of specific "bootloader"? > :If you did, what was the problem? > > Yah, I tried that... didn't work. What did work was blowing away > (zeroing) the beginning of the disk and then re-partitioning it > from scratch using a real DOS disk partition and boot0 (using fdisk -BI), > and installing boot1 and boot2 on the FreeBSD slice with disklabel's > new ability to install boot sectors on slices, using > 'disklabel -w -r -B da0s1 auto'. That worked. I incorporated the > sequence into the disklabel manual page near the end of the EXAMPLES > section. > > :P.S. On our FreeBSD hosts bunch we almost proved practically that the > :only safe partitioning is to create DOS slices (with below-cyl-1024 > :bootable one) with LBA geometry specified to fdisk. Any another approach > :leads to something strange effects: e.g. BTX cannot load /boot/loader > :and loads kernel directly, with natural `nlist failed'. But we never > :tried to change fake PT on dedicated disk directly. > : > :/netch > > I haven't had to do that. Yet. > > -Matt > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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