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[bug #45853] Fix iPXE support

From: Vít Ondruch
Subject: [bug #45853] Fix iPXE support
Date: Tue, 01 Sep 2015 10:04:48 +0000
User-agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:40.0) Gecko/20100101 Firefox/40.0


                 Summary: Fix iPXE support
                 Project: GNU GRUB
            Submitted by: vo_x
            Submitted on: Tue 01 Sep 2015 10:04:47 AM GMT
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 2.02~beta1
         Reproducibility: None
         Planned Release: None



Description of problem:
Trying to boot Fedora using iPXE from GRUB [1], it does not work. Following
the manual how to add the boot menu item, the boot fails with the "kernel too
old" message. Failure with similar symptoms was already reported as bug

This is probably caused due to iPXE kernel reporting its version as 1.0.0+:

$ file /boot/bfo.lkrn 
/boot/bfo.lkrn: Linux kernel x86 boot executable bzImage, version 1.0.0+
(a937), RO-rootFS,

$ file /boot/vmlinuz-3.18.7-200.fc21.x86_64 
/boot/vmlinuz-3.18.7-200.fc21.x86_64: Linux kernel x86 boot executable
bzImage, version 3.18.7-200.fc21.x86_64
(address@hidden, RO-rootFS, swap_dev 0x5, Normal VGA

This is rather naive to check some Kernel features by its version. How many
features are backported into RHEL Kernel versions? Could you please decide if
required functionality is available by other means?

BTW I originally reported the issue against fedora-infrastructure [2].

[1] http://boot.fedoraproject.org/
[2] https://fedorahosted.org/fedora-infrastructure/ticket/4437

Version-Release number of selected component (if applicable):
$ rpm -q grub2

I originally reported the issue here:

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1215693


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