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[Launchpad Bug Tracker <1384955@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package debian-installer -
20101020ubuntu451.10

---------------
debian-installer (20101020ubuntu451.10) xenial; urgency=medium

  [ dann frazier ]
  * arm64/xgene-uboot: Set the correct compression flag when generating
    a uImage of a gzip'd kernel. LP: #1384955.
  * Tell GRUB to load the gzio module on arm64 now that we're booting
    a compressed kernel. LP: #1632473.

  [ Adam Conrad ]
  * Add HWE variants for all architectures except powerpc (LP: #1662712)
  * Move master kernels to 4.4.0-62.
  * Rebuild to pick up new components (LP: #1572620, #1558271)

 -- Adam Conrad <adconrad@xxxxxxxxxx>  Tue, 07 Feb 2017 07:13:40 -0700

** Changed in: debian-installer (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1384955

Title:
  support compressed kernels on arm64

Status in debian-installer package in Ubuntu:
  Fix Released
Status in flash-kernel package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux-hwe-edge package in Ubuntu:
  New
Status in debian-installer source package in Xenial:
  Fix Released
Status in flash-kernel source package in Xenial:
  Fix Released
Status in linux-hwe-edge source package in Xenial:
  New
Status in flash-kernel package in Debian:
  New

Bug description:
  [Impact]
  Ubuntu kernels >= hwe-y (4.8) will no longer boot on xgene/uboot systems. The image size appears to have outgrown the defined firmware region, and u-boot will error out with a checksum mismatch error. A solution for this is to start shipping a compressed kernel (Image.gz target). flash-kernel needs updating to detect a compressed kernel and set the appropriate uImage compression flag. Similarly, d-i needs updating because it does it's own uImage generation.

  [Test Case]
  Boot an hwe-y kernel on an xgene/uboot system (APM Mustang, HP ProLiant m400).

  [Regression Risk]
  The necessary code is in place and in-use for yakkety, and no issues have been discovered there. The SRU involves clean cherry-picks of that code for d-i & f-k. The kernel side needs to be modified to pull in the correct version of flash-kernel for xenial.

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