Re: Dedicated grub2 partition

[Barry Jackson]

On 02/10/10 05:17, Goh Lip wrote:
> On Saturday 02,October,2010 07:07 AM, Barry Jackson wrote:
> > 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
> }

No - invalid signature error. Slack uses lilo by default and I know
nothing about lilo. Not sure if it has a bootloader in the partition
boot sector.
> 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
> }
No I'm not booting PCLOS live from the .iso, I have extracted
livecd.sqfs and isolinux (folder) from the live CD and put them in my
grubmain (your booto) partition sda1 (1GB). (It fails if these are on
high partitions). The grub menu.lst entry I use then boots it fine in
legacy.
I have just succeeded in getting it working in grub2 with:-

menuentry 'PCLOS Live' {
linux (hd0,1)/isolinux/vmlinuz vga=788 livecd=livecd fromusb
root=/dev/sda1  acpi=on fstab=rw,noauto
initrd (hd0,1)/isolinux/initrd.gz
}
Note that root=... is on the linux line, my mail client wraps it.
> 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.
Again - not an iso. just vmlinuz and an initrd which I have now got
working in grub2 with:-
menuentry 'HD Installer i586' {
linux (hd0,1)/i586/vmlinuz-all BOOT_IMAGE=all-install root=/dev/ram3
ramdisk_size=32000 vga=791
initrd (hd0,1)/i586/all.rdz
}

Both the above complain about vga= being depricated and to use
gfxpayload but they still work OK.
> Also, I don't use PCLinux, but doesn't it uses 'casper' rather than
> 'livecd'?
No my 2010 version uses livecd.
You used 'rw' in the linux line. you have 'persistent' and a
> partition for it?
No - I used the suggested kernel command in this thread (my posts are by
"barjac")
http://www.pclinuxos.com/forum/index.php/topic,74370.msg610420.html#msg610420
> Again, I am puzzled that you can boot these before grub2. Please
> confirm. I really want to know.
Yes it really works and boots faster than my main systems. A handy tool
as it uses all the draktools that I am familiar with in Mandriva - my
main distro.
> Regards - Goh Lip
Cheers - Barry