[Bug 1384955] Re: support compressed kernels on arm64

[dann frazier]

I verified this by:
 - MAAS deploying an HP ProLiant m400 system w/ xenial
 - enabling proposed
 - adding ppa:canonical-kernel-team/unstable (for next step)
 - installing linux-image-extra-4.8.0-37-generic 4.8.0-37.39~16.04.2
 - verified that the previous step caused flash-kernel from proposed to be installed
 - verified that the new kernel landed a compressed kernel image in /boot
 - rebooting
 - verified that i booted into the newly installed kernel


** Tags removed: verification-needed
** Tags added: verification-done

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to flash-kernel in Ubuntu.
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 Committed
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/debian-installer/+bug/1384955/+subscriptions