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Minim. iso boot grub2 d.find the root block device / memdisk
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kaTiezei
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Joined: 10 Mar 2013
Posts: 39

PostPosted: Fri Aug 30, 2013 4:47 pm    Post subject: Minim. iso boot grub2 d.find the root block device / memdisk Reply with quote

Hello,

I am trying to boot the minimal gentoo ISO through GRUB2. After trying several menu entries, the following work partly:

Code:

search --fs-uuid --set <individual uuid replaced>

menuentry "Gentoo Linux minimal install cd x86 20090623" {
  loopback loop /boot/images/install-x86-minimal-20130820.iso
  linux    (loop)/isolinux/gentoo root=/dev/ram0 init=/linuxrc  dokeymap looptype=squashfs loop=/image.squashfs cdboot initrd=gentoo.igz vga=791
  initrd   (loop)/isolinux/gentoo.igz
}

from https://forums.gentoo.org/viewtopic-t-790015-highlight-grub2+iso.html .
This boots rather quickly compared to the memtest alternative, but stops after chosing the keyboard layout with "Could not find the root block device in .
Please specify another value or press ..."

and memdisk:
Code:

### BEGIN /etc/grub.d/60_grub-imageboot ###
menuentry "Bootable ISO Image: install-x86-minimal-20130820" {
   insmod part_msdos
   insmod ext2
   set root='(hd0,msdos7)'
   search --no-floppy --fs-uuid --set=root <individual uuid replaced>
   linux16 /boot/memdisk iso
   initrd16 /boot/images/install-x86-minimal-20130820.iso
}

boots fully, but before the screen where you have to press any key in order to boot from CD it shows:
"MEMDISK: Image seems to have fractional end cylinder
MEMDISK: Image appears to be truncated"
Also the memtest version takes much longer.

Do I have to worry about the truncation, if that is real? I don't want to install anything corrupt in a new system.

And how do I fix the first one?
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