Re: [gentoo-user] Booting LiveCD iso from hard drive with GRUB legacy

[Mick]

On Monday 20 May 2013 08:18:55 Ivan T. Ivanov wrote:

> > -----Original Message-----
> > From: Mick [mailto:michaelkintzios@×××××.com]

> > Unfortunately, I don't have enough space to place the ISO in the /boot
> > partition and I don't use an initrd.
>
> initrd is an option/command of the grub itself, instead of pcdoctor.iso
> knopix iso image have to be specified and regarding space limitation ...
> image could be placed anywhere in the file system only requirements is
> that it have to be mounted/accessible by grub during boot.

OK, I pointed initrd to (hd0,10)/KNOPPIX......iso, but I don't know how to 
mount /dev/sda11 as part of the booting process.

This is how I specified it:

title Knoppix ISO
root (hd0,9)
kernel /boot/isolinux/memdisk iso raw
initrd (hd0,10)/KNOPPIX_V7.0.5DVD-2012-12-21-EN.iso

Where (hd0,9) is my /boot partition and (hd0,10) is a large partition that 
contains various images.


> > Trying to understand your grub entry - what is /boot/memdisk?  Have you
> > built
> > some eltorito image for your purpose?  How does it work?
>
> I am not sure how memdisk is working :-), it is part of sys-boot/syslinux
> My understanding is that grub is loading memdisk as a kernel/os with an
> option 'iso' and initrd option specifies what to mount as a rootfs??

Yes, that's right:

  http://www.syslinux.org/wiki/index.php/MEMDISK


Unfortunately, it can only boot some images it seems, or it can only boot them 
if they have been stored in /boot.  I copied memdisk from the KNOPPIX DVD to 
my /boot, grub finds it and runs it, but then it fails to load the Knoppix ISO 
with this error:

  MEMDISK: No ramdisk image specified!


-- 
Regards,
Mick