Tom H wrote:
On Sun, Oct 24, 2010 at 5:06 PM, tom oakes <[email protected]> wrote:
I have a computer configured with 2 disk drives configured as follows: shown
with parted -l ubuntu:
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
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.
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
}
So, at the grub cli, sdb=hd0...
How about (hd0,msdos1,bsd1)?
You should be able to get "/dev/ad4s1a"'s "(hd...)" with "grub-probe
--target=drive --device /dev/sdbXY"
I tried set root=(hd0,msdos1,bsd1) and set root=(hd1,msdos1,bsd1),
neither worked.
set root=(hd0,msdo1) found the freebsd loader but could not find the loader.
I found a long thread in the grub-devel mailing list that seemed to say
that things were broken with some installations of free bsd. Iy didn't
seem to offer a reasonable workaround so I may just give up for now.
BTW: the big disk was partitioned by the freebsd 8.1 installer. I
deleted partition 3 and created a extended partition in its place with
two logical petitions. One is used for ubuntu and the other for swap.
If anyone knows anything else I should try please let me know.
Tom Oakes
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