From owner-freebsd-questions@FreeBSD.ORG Tue Jul 19 11:01:05 2005 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3594D16A41C for ; Tue, 19 Jul 2005 11:01:05 +0000 (GMT) (envelope-from dexter@ambidexter.com) Received: from tortoise.way.lv (7.lmuza.lv [195.13.151.139]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6ACC543D46 for ; Tue, 19 Jul 2005 11:01:03 +0000 (GMT) (envelope-from dexter@ambidexter.com) Received: from localhost (localhost [127.0.0.1]) by tortoise.way.lv (Postfix) with ESMTP id A85591FED57; Tue, 19 Jul 2005 14:00:45 +0300 (EEST) Received: from tortoise.way.lv ([127.0.0.1]) by localhost (tortoise [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 07636-08; Tue, 19 Jul 2005 14:00:40 +0300 (EEST) Received: from [192.168.1.100] (unknown [62.85.46.110]) by tortoise.way.lv (Postfix) with ESMTP id 97EFB1FED52; Tue, 19 Jul 2005 14:00:40 +0300 (EEST) Mime-Version: 1.0 Message-Id: In-Reply-To: <6.1.0.6.2.20050719032713.10bf1da0@cobalt.antimatter.net> References: <6.1.0.6.2.20050719032713.10bf1da0@cobalt.antimatter.net> Date: Tue, 19 Jul 2005 14:00:48 +0300 To: Glenn Dawson , freebsd-questions@freebsd.org From: Michael Dexter Content-Type: text/plain; charset="us-ascii" ; format="flowed" X-Virus-Scanned: by amavisd-new-20030616-p10 (Debian) at way.lv Cc: Subject: Re: Remove GRUB? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 Jul 2005 11:01:05 -0000 >>I was experimenting with the GRUB bootloader and would now like to >>remove it. Something went wrong and I must now use a bootable CD >>that gives me an option to "boot to the first partition" and the >>system boots fine. >> >>man bsdlabel gives: >> >>Installing Bootstraps >> If the -B argument is specified, bootstrap code will be read from the >> file /boot/boot and written to the disk. >> >>Assuming that this affects the mbr of the who drive, I tried: >> >>localhost# bsdlabel -B /dev/ad0 >>localhost# bsdlabel: /dev/ad0: no valid label found >> >>No problem, let's try the root partition: >> >>bsdlabel -B /dev/da0s1a >> >>No error, it blinked the hard drive activity light and appears to >>have done something but alas, it still reports a GRUB error 21 >>rather than given any sign of the FreeBSD loader. >> >>Any pointers to the rescue/install procedures applicable to this? > >Did you use fdisk to check and see if the first slice is marked as >active? Here's a sample from one of my systems: > >Media sector size is 512 >Warning: BIOS sector numbering starts with sector 1 >Information from DOS bootblock is: >The data for partition 1 is: >sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD) > start 63, size 10474317 (5114 Meg), flag 80 (active) > beg: cyl 0/ head 1/ sector 1; > end: cyl 651/ head 254/ sector 63 >The data for partition 2 is: >sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD) > start 10474380, size 10458315 (5106 Meg), flag 0 > beg: cyl 652/ head 0/ sector 1; > end: cyl 1023/ head 254/ sector 63 >The data for partition 3 is: > >The data for partition 4 is: > > >note the flag 80 in the first entry. The results appear similar: localhost# fdisk ad0 ******* Working on device /dev/ad0 ******* parameters extracted from in-core disklabel are: cylinders=155061 heads=16 sectors/track=63 (1008 blks/cyl) Figures below won't work with BIOS for partitions not in cyl 1 parameters to be used for BIOS calculations are: cylinders=155061 heads=16 sectors/track=63 (1008 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: sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD) start 63, size 81915372 (39997 Meg), flag 80 (active) beg: cyl 0/ head 1/ sector 1; end: cyl 1023/ head 254/ sector 63 The data for partition 2 is: sysid 131 (0x83),(Linux native) start 81915435, size 61432560 (29996 Meg), flag 0 beg: cyl 1023/ head 255/ sector 63; end: cyl 1023/ head 254/ sector 63 The data for partition 3 is: sysid 130 (0x82),(Linux swap or Solaris x86) start 143347995, size 12948390 (6322 Meg), flag 0 beg: cyl 1023/ head 255/ sector 63; end: cyl 1023/ head 254/ sector 63 The data for partition 4 is: localhost# On a related note, once working, how does one configure the FreeBSD loader to give the Linux partition as an option? It seems to have happened "automagically" in the past. Thanks, Michael.