From owner-freebsd-questions@FreeBSD.ORG  Thu Mar 10 20:02:46 2005
Return-Path: <owner-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 B57C616A4CE
	for <freebsd-questions@freebsd.org>;
	Thu, 10 Mar 2005 20:02:46 +0000 (GMT)
Received: from web52608.mail.yahoo.com (web52608.mail.yahoo.com
	[206.190.39.146])
	by mx1.FreeBSD.org (Postfix) with SMTP id 2B79C43D31
	for <freebsd-questions@freebsd.org>;
	Thu, 10 Mar 2005 20:02:46 +0000 (GMT)
	(envelope-from davidclear@yahoo.com)
Received: (qmail 78141 invoked by uid 60001); 10 Mar 2005 20:02:45 -0000
Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
	s=s1024; d=yahoo.com;
	b=Um8LHaUlznParbDiNOh/w8yuF9F5p+jr3Pa8B5CX9unKiSk+jgKtSXPWUKWdifZdZmHEg5S9bLdyQLZY+dOhrSlYAb25tDVTWpLNnAmTIwJSJnqcVrcYEHfRgNPyhAZ265gOZz7y7VtEM46QNx4/AS12J7EuNRb26huNAG21Cjk=
	;
Message-ID: <20050310200245.78139.qmail@web52608.mail.yahoo.com>
Received: from [69.237.122.17] by web52608.mail.yahoo.com via HTTP;
	Thu, 10 Mar 2005 12:02:45 PST
Date: Thu, 10 Mar 2005 12:02:45 -0800 (PST)
From: David Clear <davidclear@yahoo.com>
To: freebsd-questions@freebsd.org
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Subject: FreeBSD-4.11 - Need help with booting with an MD_ROOT
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 10 Mar 2005 20:02:47 -0000

I have been trying, unsuccessfully, to boot a
kernel with an embedded root filesystem.  I've
searched the mailing lists and the web without finding
an answer.  I hope someone here can help.

Here's the procedure I have used:

1. My kernel is built with options: MFS, MD_ROOT and
MD_ROOT_SIZE=32768.

2. A disk image is produced using:

cd /
dd if=/dev/zero bs=1024 count=32768 of=mdimg
vnconfig -s labels -c vn0 mdimg
disklabel -rw vn0 auto
disklabel -e vn0
copy the c: to a: and change the FS type to 4.2BSD
newfs -b 8192 -f 1024 -U /dev/vn0a
mount /dev/vn0a /mnt
tar cf - bin etc sbin | ( cd /mnt && tar xpf - )
umount /mnt
vnconfig -u vn0

The filesystem contents aren't supposed to be useful
at this point - I just want to get it to mount

3. I install the filesystem image into the kernel
using:

/usr/src/release/write_mfs_in_kernel kernel mdimg

4. In /boot/loader.conf I add:

vfs.root.mountfrom="ufs:/dev/md0a"

Now I reboot with the kernel, and I get:

Mounting root from ufs:/dev/md0a
Root mount failed: 22
Mounting root from ufs:/dev/md0c
Root mount failed: 22

... and then it prompts for a root filesystem.


The EINVAL (error 22) is coming from
kern/subr_diskslice.c:806:

if (part != RAW_PART
    && (sp->ds_label == NULL || part >= sp->ds_label))
  return (EINVAL);        /* XXX needs translation */

Specifically, part = 0 (!= RAW_PART) and sp->ds_label
= NULL.


I hope it's a trivial step I am missing, but right now
I am stuck.

Sage advice is appreciated.

Regards,
David.