[Bug 1761611] Re: Incorrect dtb backup file

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This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1761611

** Tags added: iso-testing

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Title:
  Incorrect dtb backup file

Status in flash-kernel package in Ubuntu:
  New

Bug description:
  Testing the latest 18.04 raspberry server image on my pi 3.  I
  upgraded the kernel to the proposed version (from 4.13* to 4.15*).
  Backups of the vmlinuz, initrd.img and dtb files were made on the
  system-boot partition automatically by flash-kernel.

  However, on closer inspection the bcm2709-rpi-2-b.dtb and
  bcm2709-rpi-2-b.dtb.bak files were the same file.  Similarly the
  bcm2710-rpi-3-b.dtb and bcm2710-rpi-3-b.dtb.bak were the same.  These
  files had changed between the 4.13* and 4.15* kernels and so they
  shouldn't be the same.  Both the *2710*.dtb and *2710*.dtb.bak are
  from the latest kernel (4.15*).  Whereas the 2709 files are from the
  old kernel (4.13*).

  The vmlinuz.bak and initrd.img.bak were correct.

  This is possibly caused because I had to modify the server image to
  work on the pi 3 (I manually copied the *2710*dtb file).  The problem
  may correct itself on subsequent kernel upgrades.

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