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[Solved] GRUB2 Cannot Open Root Device
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solamour
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Joined: 21 Dec 2004
Posts: 511
Location: San Diego, CA

PostPosted: Wed Nov 06, 2013 7:12 pm    Post subject: [Solved] GRUB2 Cannot Open Root Device Reply with quote

I'm at "Chainloading GRUB2 from GRUB Legacy to test the setup" section in "GRUB2 migration from GRUB Legacy" (http://www.gentoo.org/doc/en/grub2-migration.xml).

When GRUB Legacy shows up, I see my usual legacy entry and GRUB2 Chainloading. When I select my legacy entry, everything boots up fine. But when I select GRUB2 Chainloading, GRUB2 screen shows up, and I'm greeted with "VFS: Cannot open root device b2a25719-0d1e-4ab3-b76e-5ed3256d728a or unknown-block(0,0): error -6".

If I press "e" to change GRUB2 entry from "root=UUID=b2a25719-0d1e-4ab3-b76e-5ed3256d728a" to "root=/dev/sda1", then everything works fine. Please share any suggestions.

Code:
# blkid
/dev/sda1: UUID="b2a25719-0d1e-4ab3-b76e-5ed3256d728a" TYPE="ext4"


[/boot/grub/grub.cfg]
menuentry 'Gentoo GNU/Linux' --class gentoo --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-b2a25719-0d1e-4ab3-b76e-5ed3256d728a' {
    load_video
    insmod gzio
    insmod part_msdos
    insmod ext2
    set root='hd0,msdos1'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos1'  b2a25719-0d1e-4ab3-b76e-5ed3256d728a
    else
      search --no-floppy --fs-uuid --set=root b2a25719-0d1e-4ab3-b76e-5ed3256d728a
    fi
    echo    'Loading Linux 3.10.7-gentoo-r1 ...'
    linux   /boot/kernel-3.10.7-gentoo-r1 root=UUID=b2a25719-0d1e-4ab3-b76e-5ed3256d728a ro
}

__
sol


Last edited by solamour on Fri Nov 08, 2013 3:54 am; edited 1 time in total
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mv
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Joined: 20 Apr 2005
Posts: 4557

PostPosted: Wed Nov 06, 2013 8:03 pm    Post subject: Reply with quote

You cannot use root=UUID=... without an initrd. (This has nothing to do with grub/grub2: The linux kernel is not able to interpret this parameter; it can only be interpreted by an initrd).
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solamour
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Joined: 21 Dec 2004
Posts: 511
Location: San Diego, CA

PostPosted: Wed Nov 06, 2013 9:44 pm    Post subject: Reply with quote

Indeed. After creating initramfs using dracut, the system boots up without a problem using GRUB2. Thanks for taking time to respond.
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sol
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