[Bug 1476882] Re: arm64: synchronous abort booting linux

[dann frazier]

I've pushed a proposed fix - a clean cherry pick from upstream - here:

The following changes since commit
38a01d84bb5171a1af7a87bcb45d89febd74907f:

  releasing package grub2 version 2.02~beta2-26 (2015-06-14 10:05:04
+0100)

are available in the git repository at:

  https://git.launchpad.net/~dannf/grub2 origin/people/dannf/arm64
-correct-dev-path-length

for you to fetch changes up to 8b5d5f706e27bcb81a7fefa0a03fd21741228195:

  merge patched-origin/people/dannf/arm64-correct-dev-path-length into
origin/people/dannf/arm64-correct-dev-path-length (2015-07-21 19:27:30
-0600)

----------------------------------------------------------------
Leif Lindholm (1):
      arm64: set correct length of device path end entry

dann frazier (1):
      merge patched-origin/people/dannf/arm64-correct-dev-path-length into origin/people/dannf/arm64-correct-dev-path-length

 debian/.git-dpm                                                        |  4 ++--
 debian/patches/arm64-set-correct-length-of-device-path-end-entry.patch | 29 +++++++++++++++++++++++++++++
 debian/patches/series                                                  |  1 +
 grub-core/loader/arm64/linux.c                                         |  2 +-
 4 files changed, 33 insertions(+), 3 deletions(-)
 create mode 100644 debian/patches/arm64-set-correct-length-of-device-path-end-entry.patch

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https://bugs.launchpad.net/bugs/1476882

Title:
  arm64: synchronous abort booting linux

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  [Impact]
  On some UEFI firmware (debug versions of Tianocore, as well as builds from AMI), GRUB will fail with Synchronous Aborts when starting the Linux kernel. It is therefore not possible to install or run Ubuntu on these systems.

  [Test Case]
  Download the Ubuntu debian-installer netboot.tar.gz  and boot and direct a system to boot from the grubnet image within. (Currently only 15.10 and newer have this tarball, though it should eventually appear in 14.04 as an SRU).

  [Regression Risk]
  The proposed patch touches only arm64 code, which limits the impact to just arm64 systems. There are few ARM64/UEFI systems on the market/supported by Ubuntu, so the risk is quite contained.

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