[Bug 1636838] Please test proposed package

[Chris J Arges]

Hello Yung, or anyone else affected,

Accepted flash-kernel into xenial-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/flash-
kernel/3.0~rc.4ubuntu62.1.1 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: linux-firmware-raspi2 (Ubuntu Xenial)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1636838

Title:
  Failed to boot

Status in flash-kernel package in Ubuntu:
  Fix Released
Status in linux-firmware-raspi2 package in Ubuntu:
  Fix Released
Status in linux-raspi2 package in Ubuntu:
  Confirmed
Status in u-boot package in Ubuntu:
  Fix Released
Status in flash-kernel source package in Xenial:
  Fix Committed
Status in linux-firmware-raspi2 source package in Xenial:
  Fix Committed
Status in linux-raspi2 source package in Xenial:
  New
Status in u-boot source package in Xenial:
  Fix Committed

Bug description:
  [Impact]

   * Unable to boot into system after upgrade to 4.4.0-1030.37

  [Test Case]

   * fresh install ubuntu-16.04.1-preinstalled-server-
  armhf+raspi2.img.xz

   * enable -proposed and 'apt full-upgrade'

  [Regression Potential]

   * red led still on, but few green led blinks then stay at the black
  screen(hdmi on)

  [Other Info]

   * restore the working boot partition backup image could recover the
  situation

  [Solution]

  * The latest X/raspi2 kernel in -proposed blows the space the
  bootloader reserves for the DTB, making the board unbootable (it only
  happens with classic rpi2 images created by the Foundation, Snappy is
  fine)

  * Ppa:p-pisati/misc has these 3 new packages that fix it:

   - linux-firmware-raspi2 - contains the latest Broadom fw release, and
     upon installation checks that /boot/firmware/config.txt contains the
     new DTB memory location, and if not, it does the necessary
     modification on behalf of the user
   
   - flash-kernel - modifies uboot.env to find the DTB in the new memory location
   
   - uboot -  update uboot to work with the new boot firmware (aka skip
     serial initialization if already done by the fw), contains the
     mkknlimg required when installing a new u-boot binary and correctly
     installs the uboot binary in the vfat partition

  [How to test it]

  * Install a fresh foundation image, add my misc ppa and the xenial
  -proposed repository, apt-get update && dist-upgrade, once the board
  completes the upgrade reboot it.

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