From owner-freebsd-current  Fri Nov 29 23:43:50 2002
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To: Manfred Antar <null@pozo.com>
Subject: Re: Update to UFS2 Superblock Format 
Cc: current@FreeBSD.ORG, Robert Watson <rwatson@tislabs.com>,
	re@FreeBSD.ORG, Poul-Henning Kamp <phk@critter.freebsd.dk>
In-Reply-To: Your message of "Fri, 29 Nov 2002 23:16:51 PST."
             <5.2.0.9.2.20021129231408.00ac35f8@pozo.com> 
Date: Fri, 29 Nov 2002 23:43:45 -0800
From: Kirk McKusick <mckusick@beastie.mckusick.com>
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	Date: Fri, 29 Nov 2002 23:16:51 -0800
	To: Kirk McKusick <mckusick@beastie.mckusick.com>
	From: Manfred Antar <null@pozo.com>
	Subject: Re: Update to UFS2 Superblock Format 
	Cc: current@FreeBSD.ORG, Robert Watson <rwatson@tislabs.com>,
	    re@FreeBSD.ORG, Poul-Henning Kamp <phk@critter.freebsd.dk>
	In-Reply-To: <200211300711.gAU7Bt59078123@beastie.mckusick.com>
	X-ASK-Info: Whitelist match

	At 11:11 PM 11/29/2002 -0800, Kirk McKusick wrote:
	>You will have to ask Puol-Henning Kamp, but I do not believe that 
	>he has yet put together a bootstrap for the i386 platform that can 
	>boot from a UFS2 filesystem. As such, I believe that you are
	>required to have a UFS1 root on the i386 at this time. I have
	>copied Poul-Henning Kamp so that he can correct me if I am incorrect
	>on this point.
	>
	>        Kirk McKusick

	Ah
	No wonder, I tried editing the /sys/boot/i386/boot2/Makefile
	to enable UFS2 bootblock but then disklabel complained that
	boot2 was too big. I will have to revert to UFS1
	Thanks
	Manfred

	==================================
	||      null@pozo.com           ||
	||      Ph. (415) 681-6235      ||
	================================== 

You have hit upon the exact problem. UFS2 has a much bigger area
reserved for the boot block, but the programs that set up disk labels
and boot blocks don't know about it yet so assume that they have to
cram into the much smaller UFS1 boot-block area.

	Kirk McKusick

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