[Bug 1384955] Update Released

[Adam Conrad]

The verification of the Stable Release Update for flash-kernel has
completed successfully and the package has now been released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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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 Committed
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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