[Bug 1229738] Re: grub doesn't boot with efi and md raid root

[Andy Sayler]

I've encountered this issue as well running 12.04.3 with a 5-device RAID
6 array using grub + EFI + Secure Boot.

I worked around it by manually creating a grub.cfg file on the EFI
partition that just changes the root to the correct /boot md partition
and then reloads the actual /boot/grub.cfg file.

Details here:
http://ubuntuforums.org/showthread.php?t=2190716&p=12861263#post12861263

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to grub2 in Ubuntu.
https://bugs.launchpad.net/bugs/1229738

Title:
  grub doesn't boot with efi and md raid root

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  dick at reordberend:/tmp$ lsb_release -rd
  Description:	Ubuntu 12.04.3 LTS
  Release:	12.04

  dick at reordberend:/tmp$ apt-cache policy grub-efi-amd64
  grub-efi-amd64:
    Installed: 1.99-21ubuntu3.10
    Candidate: 1.99-21ubuntu3.10

  
  Installed 12.04.3 LTS Server using md raid1 for root partition on x86-64 box using EFI boot.

  
  Grub installs its EFI app correctly, and it launches at boot.  However, grub can't find the root partition.  Inspecting grub's config shows that it has prefix and root set to the EFI boot partition.  Manually setting those to the raid1 root partition at the grub prompt and running normal allows booting to proceed correctly (ie following the instructions at http://www.gnu.org/software/grub/manual/html_node/GRUB-only-offers-a-rescue-shell.html works).

  
  In EFI mode, grub seems to expect its grub.cfg and modules to be in the EFI partition.  However, they are all installed in the root filesystem.  The problem can be solved in the grub-install script by giving an embedded config to grub-mkimage (http://www.gnu.org/software/grub/manual/html_node/Embedded-configuration.html).  grub-install already has support for this, but it fails if the root partition is raided.

  Inside grub-install, if devabstraction_module is set (and with md as
  the root partition it will be) then config_opt_file is never set.  The
  attached patch solves the bug for me but will doubtless require
  refining to be generally applicable.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1229738/+subscriptions