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[dann frazier <dann.frazier@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Andy Whitcroft (apw)

** Also affects: linux-hwe-edge (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: linux (Ubuntu Xenial)

** Changed in: linux-hwe-edge (Ubuntu Xenial)
     Assignee: (unassigned) => Andy Whitcroft (apw)

** Changed in: flash-kernel (Ubuntu Xenial)
     Assignee: (unassigned) => dann frazier (dannf)

** Changed in: flash-kernel (Ubuntu Xenial)
       Status: Triaged => In Progress

** Description changed:

- When building an upstream kernel using "make deb-pkg" and not any of the
- Ubuntu-specific kernel build methods (such as debian/rules binary-
- headers binary-generic), the resulting linux-image deb package includes
- a gzip-compressed kernel image (copied from Image.gz, not Image). When
- such a deb package is installed on an arm64 system (such as McDivitt)
- and flash-kernel is run, it always calls "mkimage" with "-C none", which
- results in a uImage that can't boot.
+ [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.
  
- The attached patch adds a check to the mkimage_kernel() function in
- /usr/share/flash-kernel/functions to determine whether the kernel image
- is gzip-compressed or not, and calls "mkimage" with the appropriate "-C
- gzip" or "-C none" option. I have tested this patch on McDivitt, with
- both standard Ubuntu 3.13.0-37 and upstream 3.18-rc1 kernels, and it
- works for me.
+ [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.

** Changed in: debian-installer (Ubuntu Xenial)
     Assignee: (unassigned) => dann frazier (dannf)

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

** Changed in: debian-installer (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: debian-installer (Ubuntu)
   Importance: Undecided => High

** Changed in: flash-kernel (Ubuntu)
   Importance: Undecided => High

** Changed in: flash-kernel (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: flash-kernel (Ubuntu)
     Assignee: (unassigned) => dann frazier (dannf)

** Changed in: debian-installer (Ubuntu)
     Assignee: (unassigned) => dann frazier (dannf)

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Changed in: linux-hwe-edge (Ubuntu Xenial)
   Importance: Undecided => High

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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:
  In Progress
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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