Re: Dedicated grub2 partition

[Goh Lip]

On Saturday 02,October,2010 07:07 AM, Barry Jackson wrote:
> On 01/10/10 15:42, Goh Lip wrote:
> > On Friday 01,October,2010 10:24 PM, Barry Jackson wrote:
> > > I currently use a dedicated grub legacy partition to chainload into many
> > > grub legacy systems. Is it possible to set up grub2 in a dedicated
> > > partition without having grub2 installed in any of the systems that it
> > > will chainload into?
> >
> > Barry, please see...
> > http://forum.nginx.org/read.php?26,67573
> >
> > I too had a dedicated grub partition in grub-legacy (with great help
> > from Herman of http://members.iinet.net/~herman546/p20.html), but I
> > changed it to grub2; and yes, you will need to chainload if none of the
> > OS is in grub2 (but why not?).
> >
> > Good luck, regards - Goh Lip
> >
> >
> > _______________________________________________
> > Help-grub mailing list
> > address@hidden
> > http://lists.gnu.org/mailman/listinfo/help-grub
> Thanks Goh,
> I have it working - almost.
> I upgraded an Ubuntu installation to 10.04 and used that to
> grub-install, after installing grub2, as the original had been down
> graded to legacy grub.
>
> Most of my menu entries are simple chainloads into grub legacy systems
> like this in menu.lst :-
>
> title Mandriva 2010.1 x86-64
> root (hd0,20)
> chainloader +1
>
> which in grub.cfg becomes:-
>
> menuentry 'Mandriva 2010.1 x86-64' {
> set root=(hd0,21)
> chainloader +1
> }
>
> However I have some more complex legacy grub entries which as yet I
> can't figure out. For example :-
>
> title Slackware 13
> root (hd0,22)
> kernel /boot/vmlinuz root=/dev/sda23 ro vga=788
>
> title PCLinuxOS Live
> kernel (hd0,0)/isolinux/vmlinuz livecd=livecd vga=788 fromusb
> root=/dev/sda1 acpi=on fstab=rw,noauto
> initrd (hd0,0)/isolinux/initrd.gz
>
> title HD Installer i586
> kernel (hd0,0)/i586/vmlinuz-all BOOT_IMAGE=all-install root=/dev/ram3
> ramdisk_size=32000 vga=791
> initrd (hd0,0)/i586/all.rdz
>
> Any ideas on the right way to go with these in grub2?
>
> Barry


For Slackware, wouldn't this work?
menuentry 'Slackware' {
set root=(hd0,23)
chainloader +1
}

For PCLinuxOS and HDInstaller, you're booting off the livecd iso, so you 
will need
menuentry "PCLinux Livecd" {
loopback loop (hd0,1)/<path_to_iso>/xxxPClinuxxxxxx.iso
linux (loop)/boot/isolinux/vmlinuz findiso=<path_at_iso_mount/xxxxxx.iso 
boot=livecd vga=788 fromusb
initrd (loop)/boot/<path_to_iso_mount_boot>/initrd.gz
}

Barry, can you really get this live iso booted before grub2? That is 
from grub-legacy?

Boot entry (all-install) of HDinstaller looks wrong and I don't know 
what boot it uses for the iso file; check this out by manually mounting 
first..
"mount -o loop xxxxxxxxxx.iso /mnt/xxx"
Modify accordingly.

Also, I don't use PCLinux, but doesn't it uses 'casper' rather than 
'livecd'? You used 'rw' in the linux line. you have 'persistent' and a 
partition for it?

Again, I am puzzled that you can boot these before grub2. Please 
confirm. I really want to know.

Regards - Goh Lip