From owner-freebsd-hackers@FreeBSD.ORG  Sun Jan 20 22:21:45 2008
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 6D04916A419
	for <freebsd-hackers@freebsd.org>; Sun, 20 Jan 2008 22:21:45 +0000 (UTC)
	(envelope-from kientzle@freebsd.org)
Received: from kientzle.com (h-66-166-149-50.snvacaid.covad.net
	[66.166.149.50])
	by mx1.freebsd.org (Postfix) with ESMTP id 5662D13C468
	for <freebsd-hackers@freebsd.org>; Sun, 20 Jan 2008 22:21:45 +0000 (UTC)
	(envelope-from kientzle@freebsd.org)
Received: (from root@localhost)
	by kientzle.com (8.12.9/8.12.9) id m0KMLhnu028198;
	Sun, 20 Jan 2008 14:21:43 -0800 (PST)
	(envelope-from kientzle@freebsd.org)
Received: from [10.0.0.209] (p54.kientzle.com [66.166.149.54])
	by kientzle.com with SMTP; Sun, 20 Jan 2008 14:21:43 -0800 (PST)
	(envelope-from kientzle@freebsd.org)
Message-ID: <4793C977.9000803@freebsd.org>
Date: Sun, 20 Jan 2008 14:21:43 -0800
From: Tim Kientzle <kientzle@freebsd.org>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.7.12) Gecko/20060422
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Adrian Penisoara <ady@freebsd.ady.ro>
References: <78cb3d3f0801201239x18c339a6sbc6a04d2b5670b81@mail.gmail.com>
In-Reply-To: <78cb3d3f0801201239x18c339a6sbc6a04d2b5670b81@mail.gmail.com>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
Cc: freebsd-hackers@freebsd.org
Subject: Re: Squeezing out some 70 bytes out of the boot2 loader
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 20 Jan 2008 22:21:45 -0000

Adrian Penisoara wrote:
> Hello
> 
>   I am trying to hack in some symlink support into the [sys/boot/i386/]boot2
> bootloader (for my project [1]) and I seem to fall short of about 69 bytes:
> 
...
> 
> [1] I'm trying to get support for /boot being mounted as a separate FS and
> as such I would need to have a "self-pointing" symlink (e.g. "boot -> ." )

Just because there is a symlink doesn't mean boot2 has
to follow it.

I haven't looked at the boot2 code, but I presume
there's the equivalent of "chdir boot" in there.
What if you just ignored failure (if there's no
"boot" entry or "boot" isn't a dir, assume the
boot files are in the root of the FS).

Wouldn't that work just as well and require less space?

Cheers,

Tim Kientzle