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[Achille Fouilleul <achille.fouilleul@xxxxxxxx>]

I think there is a bug, even in the latest (3.13.0-23.45) revision.
It probably affects any 32-bit EFI system.

One easy way to fix it is to insert the following line in
efi_32.c:efi_map_region():

        set_bit(EFI_OLD_MEMMAP, &x86_efi_facility);

This helps ensure that the function efi.c:runtime_code_page_mkexec() is called by efi_enter_virtual_mode().
I have rebuilt the kernel with this change and my machine runs fine now.

A temporary workaround is to use the efi=old_map kernel parameter.

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https://bugs.launchpad.net/bugs/1301590

Title:
  System does not boot

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I'm currently stuck with the 3.13.0-19-generic version.
  With both 3.13.0-20 and 3.13.0-21, the boot process fails very early: even without "quiet splash" in the kernel command line, I do not get any message beyond those of EFI GRUB (loading kernel & initrd).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-21-generic 3.13.0-21.43
  ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
  Uname: Linux 3.13.0-19-generic i686
  ApportVersion: 2.14-0ubuntu1
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  achille    2265 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Apr  2 22:05:04 2014
  HibernationDevice: RESUME=UUID=400897eb-e3fd-4d74-9494-e71d1dd2517b
  InstallationDate: Installed on 2010-05-01 (1432 days ago)
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  MachineType: Apple Computer, Inc. Macmini1,1
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-19-generic root=UUID=d71e39d9-2cd3-4fa5-911e-b6bc7301ec72 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-19-generic N/A
   linux-backports-modules-3.13.0-19-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-02-22 (39 days ago)
  dmi.bios.date: 10/12/06
  dmi.bios.vendor: Apple Computer, Inc.
  dmi.bios.version: MM11.88Z.0055.B08.0610121326
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Mac-F4208EC8
  dmi.board.vendor: Apple Computer, Inc.
  dmi.board.version: PVT
  dmi.chassis.asset.tag: Asset Tag
  dmi.chassis.type: 4
  dmi.chassis.vendor: Apple Computer, Inc.
  dmi.chassis.version: Mac-F4208EC8
  dmi.modalias: dmi:bvnAppleComputer,Inc.:bvrMM11.88Z.0055.B08.0610121326:bd10/12/06:svnAppleComputer,Inc.:pnMacmini1,1:pvr1.0:rvnAppleComputer,Inc.:rnMac-F4208EC8:rvrPVT:cvnAppleComputer,Inc.:ct4:cvrMac-F4208EC8:
  dmi.product.name: Macmini1,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Computer, Inc.

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