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[bug #37771] Assignment grub_mm_base = NULL causes boot failure on EFI

From: Aaron Haviland
Subject: [bug #37771] Assignment grub_mm_base = NULL causes boot failure on EFI
Date: Mon, 19 Nov 2012 02:00:38 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.94 Safari/537.4


                 Summary: Assignment grub_mm_base = NULL causes boot failure
on EFI
                 Project: GNU GRUB
            Submitted by: ah42
            Submitted on: Mon 19 Nov 2012 02:00:36 AM GMT
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: Aaron Haviland
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: Bazaar - trunk
         Reproducibility: Every Time
         Planned Release: None



The statement in grub-core/lib/relocator.c:591:
  grub_mm_base = NULL;
causes my system to lock-up when booting in EFI mode. I have determined this
through liberal placement of grub_dprintf's, and eventually commenting out the
offending line.

By commenting this line out, I am able to progress further in the boot
sequence, but I am still unable to boot (have yet to determine *that* cause)

I haven't quite worked out why it only happens on EFI booting, since as far as
I can tell, it's not in an EFI-specific code section.

Also reported on launchpad as LP #1080521


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