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You have been subscribed to a public bug by Jan Groenewald (jan-aims):

dick@reordberend:/tmp$ lsb_release -rd
Description:	Ubuntu 12.04.3 LTS
Release:	12.04

dick@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.

** Affects: grub2 (Ubuntu)
     Importance: High
         Status: Triaged


** Tags: patch precise
-- 
grub doesn't boot with efi and md raid root
https://bugs.launchpad.net/bugs/1229738
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