Please ignore my previous comment, I introduced an err in the changelog.
Please use this cleaned up version of the patch.

** Patch added: "Yakkety kexec-tools arm64 support V3"

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  Enable ARM64 support in kexec-tools

Status in kexec-tools package in Ubuntu:
  Fix Released
Status in kexec-tools source package in Xenial:
  In Progress
Status in kexec-tools source package in Yakkety:
  In Progress
Status in kexec-tools package in Debian:
  Fix Released

Bug description:
   * kexec-tools in Xenial (16.04) currently does not support ARM64
   * Backport support for ARM64 arch from upstream
   * Majority of the patches are contained in kexec/arch/arm64/ except for
     one patch that impacts purgatory and common device tree routines.

   * I built kexec-tools for ARM64 and tested it on HW using the following
     $ sudo kexec -l /boot/vmlinuz-<version>-generic
       --command-line="root=UUID=<uuid> ro vt.handoff=7"
     $ sudo kexec -e
   * I was able to kexec the new kernel successfully.
   * [ 6702.357899] kexec_core: Starting new kernel
     [    0.000000] Booting Linux on physical CPU 0x200
     [    0.000000] Linux version <version>-generic (buildd@bos01-arm64-008)
     (gcc version 5.4.0 20160609 (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.4) )
     [    0.000000] Boot CPU: AArch64 Processor [510f8000]

   * Since patches are confined to arm[64] there is a low overall risk of

   * You can find a Xenial kexec-tools package built for AMD64, i386 and
     ARM64 in my PPA
   * This package is built using the Xenial source package for kexec-tools
     with ARM64 enablement patches applied.
   * Please pull the changes from my PPA package and integrate into Ubuntu
     Xenial kexec-tools after review.

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