grub2 on ubuntu 10.10 can't find loader on 1st partation

[tom oakes]

hello,

I have a computer configured with 2 disk drives configured as follows: 
shown with parted -l ubuntu:

Model: ATA WDC WD1600AAJB-0 (scsi)
Disk /dev/sda: 160GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End    Size   Type     File system  Flags
1      32.3kB  160GB  160GB  primary  ext2         boot


Model: ATA Hitachi HDS72101 (scsi)
Disk /dev/sdb: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type      File system     Flags
1      32.3kB  252GB   252GB   primary   freebsd-ufs     boot
2      252GB   503GB   252GB   primary   freebsd-ufs
3      503GB   755GB   252GB   extended                  lba
5      503GB   745GB   242GB   logical   ext3
6      745GB   755GB   9973MB  logical   linux-swap(v1)
4      755GB   1000GB  245GB   primary

As reported from freebsd fdisk -s :
# fdisk -s
/dev/ad4: 1938021 cyl 16 hd 63 sec
Part        Start        Size Type Flags
  1:          63   491519889 0xa5 0x80
  2:   491519952   491519952 0x83 0x00
  3:   983042046   491515906 0x0f 0x00
  4:  1474559856   478965312 0x83 0x00
# fdisk -s /dev/ad1
/dev/ad1: 310101 cyl 16 hd 63 sec
Part        Start        Size Type Flags
  1:          63   312576642 0xa5 0x80

the 160 GB disk does not have an OS installed.

Freebsd 8.1 is installed on the 1st slice of the 1st partition of the 
big disk. Fresh install.
ubuntu 10.10 is installed in the logical partition 5 of the extended 
partition 3. Fresh install.
grub version 2.6.35-22.

ubuntu  boots correctly when booting from the hard disk with grub2, but 
I have been unable to configure
grub2 to boot freebsd.

I can boot freebsd with a cd that I made with grub-legacy while 
attempting to install grub on
freebsd. I was never able to get freebsd to boot from the hard disk with 
grub-legacy or grub2 installed on freebsd.

I am able to mount, read only, successfully the freebsd partition from 
ubuntu.

As you can see in the grub.cfg copied below that ubuntu is loaded from 
set root='(hd1,msdos5)' This works, but is not consistent with what is 
returned by ls from the grub command line.

(hd0) (hd0,msdos6) (hd0,msdos5) (hd0,msdos4) (hd0,msdos2)
(hd0,msdos4,msdos1) (hd0,msdos1) (hd1) (hd1,msdos1)

A set from the grub command line shows: root=hd0,msdos5

Editing the set root and executing from the  splash screen I have tried 
these, (hd1,msdos1.msdos1) and (hd0,msdos1.msdos1),. I alway get an error.
Usually the error is: "No such Partition", sometime something about not 
finding the file. There is a file /boot/loader on the first slice of the 
first partition.

I can not use the chain loader as the MBR  for the big disk contains the 
one from ubuntu not from freebsd. 

I have not tried to put the commands to do a direct boot with code like 
like below, from http://forums.freebsd.org/showthread.php?t=5918, as the 
problem seems to be finding the loader file, not executing it.  I do not 
understand this code.

menuentry "FreeBSD ad4, direct" {
                insmod ufs2
                set root=(hd0,1,a)
                search --no-floppy --fs-uuid --set 4b22f9090565ab77
                freebsd                 /boot/kernel/kernel
                freebsd_loadenv         /boot/device.hints
                set FreeBSD.vfs.root.mountfrom=ufs:/dev/ad4s1a
                set FreeBSD.vfs.root.mountfrom.options=rw
        }


Is there something that I am missing in the configuration, or is this a 
bug in the way this version of grub2 finds partitions from a logical 
partitions?
Any suggestion as to what I should try next will be appreciated!

Tom

grub.cfg below
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
 set have_grubenv=true
 load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
 set saved_entry="${prev_saved_entry}"
 save_env saved_entry
 set prev_saved_entry=
 save_env prev_saved_entry
 set boot_once=true
fi

function savedefault {
 if [ -z "${boot_once}" ]; then
   saved_entry="${chosen}"
   save_env saved_entry
 fi
}

function recordfail {
 set recordfail=1
 if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then 
save_env recordfail; fi; fi
}

function load_video {
 insmod vbe
 insmod vga
}

insmod part_msdos
insmod ext2
set root='(hd1,msdos5)'
search --no-floppy --fs-uuid --set 34d13e9c-7bf7-4eda-aa21-d9461e6c2e12
if loadfont /usr/share/grub/unicode.pf2 ; then
 set gfxmode=640x480
 load_video
 insmod gfxterm
fi
terminal_output gfxterm
insmod part_msdos
insmod ext2
set root='(hd1,msdos5)'
search --no-floppy --fs-uuid --set 34d13e9c-7bf7-4eda-aa21-d9461e6c2e12
set locale_dir=($root)/boot/grub/locale
set lang=en
insmod gettext
if [ "${recordfail}" = 1 ]; then
 set timeout=-1
else
 set timeout=10
fi
play 480 440 1
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Ubuntu, with Linux 2.6.35-22-generic-pae' --class ubuntu 
--class gnu-linux --class gnu --class os {
       recordfail
       insmod part_msdos
       insmod ext2
       set root='(hd1,msdos5)'
       search --no-floppy --fs-uuid --set 
34d13e9c-7bf7-4eda-aa21-d9461e6c2e12
       linux   /boot/vmlinuz-2.6.35-22-generic-pae 
root=UUID=34d13e9c-7bf7-4eda-aa21-d9461e6c2e12 ro
       initrd  /boot/initrd.img-2.6.35-22-generic-pae
}
menuentry 'Ubuntu, with Linux 2.6.35-22-generic-pae (recovery mode)' 
--class ubuntu --class gnu-linux --class gnu --class os {
       recordfail
       insmod part_msdos
       insmod ext2
       set root='(hd1,msdos5)'
       search --no-floppy --fs-uuid --set 
34d13e9c-7bf7-4eda-aa21-d9461e6c2e12
       echo    'Loading Linux 2.6.35-22-generic-pae ...'
       linux   /boot/vmlinuz-2.6.35-22-generic-pae 
root=UUID=34d13e9c-7bf7-4eda-aa21-d9461e6c2e12 ro single
       echo    'Loading initial ramdisk ...'
       initrd  /boot/initrd.img-2.6.35-22-generic-pae
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
       insmod part_msdos
       insmod ext2
       set root='(hd1,msdos5)'
       search --no-floppy --fs-uuid --set 
34d13e9c-7bf7-4eda-aa21-d9461e6c2e12
       linux16 /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
       insmod part_msdos
       insmod ext2
       set root='(hd1,msdos5)'
       search --no-floppy --fs-uuid --set 
34d13e9c-7bf7-4eda-aa21-d9461e6c2e12
       linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
if [ "x${timeout}" != "x-1" ]; then
 if sleep --verbose --interruptible 5 ; then
   set timeout=0
 fi
fi
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply 
type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
menuentry "freebsd" {
insmod ufs2
set root=(hd1,1,a)
kfreebsd /boot/loader
} ### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  $prefix/custom.cfg ]; then
 source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###