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

[TEST CASE]
 * I built kexec-tools for ARM64 and tested it on HW using the following 
testcase:
   $ sudo kexec -l /boot/vmlinuz-<version>-generic 
--initrd=/boot/initrd.img-<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]
   
[REGRESSION POTENTIAL]
 * Since patches are confined to arm[64] there is a low overall risk of 
regression.

[OTHER INFO]
 * You can find a Xenial kexec-tools package built for AMD64, i386 and ARM64 in 
my PPA
    https://launchpad.net/~manjo/+archive/ubuntu/devtools/
 * 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.

** Affects: kexec-tools (Ubuntu)
     Importance: High
     Assignee: Louis Bouchard (louis-bouchard)
         Status: New

-- 
[SRU] [Xenial] Enable ARM64 support in kexec-tools
https://bugs.launchpad.net/bugs/1659618
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