Re: grub doesn't know ufs filesystem

Roberto Nunnari <roberto.nunnari@xxxxxxxx> · Thu, 15 Dec 2005 15:42:24 +0100

One more note.. let's call 'bad' the pc that grub doesn't
like and ok the others.. and note that the two pc have
identical disk drives.. so..
bad# fdisk
******* Working on device /dev/ad0 *******
parameters extracted from in-core disklabel are:
cylinders=29777 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=29777 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 30009357 (14653 Meg), flag 80 (active)
        beg: cyl 0/ head 1/ sector 1;
        end: cyl 1023/ head 254/ sector 63
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>

ok# fdisk
******* Working on device /dev/ad0 *******
parameters extracted from in-core disklabel are:
cylinders=29777 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=29777 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 30009357 (14653 Meg), flag 80 (active)
        beg: cyl 0/ head 1/ sector 1;
        end: cyl 1023/ head 3/ sector 63
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>

as you can see, there's a difference in the end head..
bad says end head is 254, while ok says end head is 3
Could that be a source of trouble?

bad# disklabel ad0s1

# /dev/ad0s1:

8 partitions:

#        size   offset    fstype   [fsize bsize bps/cpg]

  a:   524288        0    4.2BSD     2048 16384 32776

  b:  1048576   524288      swap

  c: 30009357        0    unused        0     0         # "raw" part, 
don't edit

  d:   524288  1572864    4.2BSD     2048 16384 32776

  e:   524288  2097152    4.2BSD     2048 16384 32776

  f: 27387917  2621440    4.2BSD     2048 16384 28552

ok# disklabel ad0s1

# /dev/ad0s1:

8 partitions:

#        size   offset    fstype   [fsize bsize bps/cpg]

  a:   524288        0    4.2BSD     2048 16384 32776

  b:   996992   524288      swap

  c: 30009357        0    unused        0     0         # "raw" part, 
don't edit

  d:   524288  1521280    4.2BSD     2048 16384 32776

  e:   524288  2045568    4.2BSD     2048 16384 32776

  f: 27387917  2569856    4.2BSD     2048 16384 28552

the disklabel is essentialy the same.. apart from the
size of the swap and consequently the offset of the
rest of the internal partitions..
Again.. any ideas?
--
Robi
Harley D. Eades III wrote:

On Wed, 2005-12-14 at 08:36 -0800, Micah wrote:
Roberto Nunnari wrote:
Hello list.
Please also reply to my mailbox, as I'm not on the list.
Thank you.
I have a old grub floppy that I use time to time to
boot/recover pc with different OS.. Today I wanted to
boot a freebsd 5.3-RELEASE-p23 box, but to my surprise
grub reported:
Filesystem type unknown, partition type 0xa5
and thus cannot mount /boot/loader
So I thought I'd make a grub floppy with a recent version,
but even with version 0.97 things won't change..
# cd /usr/ports/sysutils/grub

# make install

# grub

[ Minimal BASH-like line editing is supported.  For the first word, TAB

  lists possible command completions.  Anywhere else TAB lists the 
possible

  completions of a device/filename. ]
grub> root (hd0,0,a)
Filesystem type unknown, partition type 0xa5
grub> kernel /boot/loader
Error 17: Cannot mount selected partition
grub> root (hd0, <TAB>
Possible partitions are:
  Partition num: 0, [BSD sub-partitions immediately follow]
    BSD Partition num: 'a',  Filesystem type unknown, partition type 0xa5
    BSD Partition num: 'b',  Filesystem type unknown, partition type 0xa5
    BSD Partition num: 'd',  Filesystem type unknown, partition type 0xa5
    BSD Partition num: 'e',  Filesystem type unknown, partition type 0xa5
    BSD Partition num: 'f',  Filesystem type unknown, partition type 0xa5
grub> quit
# mount
/dev/ad0s1a on / (ufs, local, soft-updates)
devfs on /dev (devfs, local)
/dev/ad0s1e on /tmp (ufs, local, soft-updates)
/dev/ad0s1f on /usr (ufs, local, soft-updates)
/dev/ad0s1d on /var (ufs, local, soft-updates)
linprocfs on /usr/compat/linux/proc (linprocfs, local)
devfs on /var/named/dev (devfs, local)
Any hint/thought/advice?
Best regards.

I just installed grub from ports and duplicated your test and it works 
fine.  I'd start by checking your installation and making sure you don't 
have any other grubs in your path.  Some of the grubs that ship with 
Linux distros do not support ufs.  Do a find/locate on grub to see what 
turns up.  Do a which grub, you should get /usr/local/sbin/grub.  If 
not, issue /usr/local/sbin/grub from a command prompt and duplicate your 
test.  If that's broken, make sure your ports tree is up to date, make 
sure /usr/ports/devel/autoconf259 /usr/ports/devel/automake19 
/usr/ports/devel/gmake are up to date (grub's build dependancies) then

deinstall, clean, and reintsall the grub port.

HTH,
Micah
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I can second this, I use grub all the time, as well as test grub2 on
FreeBSD and both work great for me.
--Harley 
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Re: grub doesn't know ufs filesystem

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