Help with build world - Can't mount root after bootin from /k ernel

[Jason Dictos]

Oh Boy, woops, so doing a get from stable is actual a downgrade if you're
running 5.1??

-Jason 


-----Original Message-----
From: Kevin Oberman [mailto:oberman at es.net] 
Sent: Thursday, October 16, 2003 8:52 AM
To: Jason Dictos
Cc: 'freebsd-stable at freebsd.org'

> From: Jason Dictos <jason.dictos at tapeware.com>
> Date: Thu, 16 Oct 2003 08:43:22 -0700
> 
> Hello,
> 
> 	I had freeBSD 5.1 installed, used cvsup on the stable branch, then 
> built world.
> 
> Ok so disk 2 is the fix it disc, I'll pop that sucker in and go from
there.

OK. Does that mean you were trying to downgrade from 5.1 to STABLE? If so,
that is not supported and the odds of it working are not great. Most
notably, the loader looks for the kernel in a different place
(/boot/kernel/kernel instead of /kernel) and V5 defaults to UFS2 partitions
when you newfs. (V4 does not understand UFS2, so that would explain the
failure to mount root.)

The UFS2 issue is the big one. I don't know any way around this except to
make a set of UFS1 partitions on either a different slice or a different
disk and use dd or dump/restore to get your file systems mountable under V4.
Then re-build the loader and that MAY get you bootable, but the files in
/etc and some other places may still haunt you. A clean install is probably
far easier (although you will learn a lot about FreeBSD if you do try to
downgrade.
--
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634

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