[Bug 1859478] [NEW] Use the 5.3 kernel for the raspi3 bionic 18.04.4 images

[Łukasz Zemczak]

Public bug reported:

[Impact]

Currently our bionic images only support the pi2, pi3 and cm3 families
of devices. For 18.04.4 we would also like to enable support for the pi4
(available in eoan+). For this to work, kernel support is required -
this can be achieved by either backporting all the needed pi4 patches to
the 4.15 kernel *or* using the 5.3 raspi one from focal that has already
been tested and working. We decided that using 5.3 is the smartest and
safest bet, so for this to work we need to use a different kernel
flavour - linux-raspi2-5.3.

This requires a change in livecd-rootfs to pull in the new kernel
flavour for our raspi3 images.

[Test Case]

Build a raspi3 classic bionic image via cdimage with -proposed enabled.
Confirm that linux-raspi2-5.3 is used instead of linux-raspi2.

[Regression Potential]

None really. The only thing that could go wrong is that the raspi3
images would be using the wrong kernel - but that would fail
verification then.

** Affects: livecd-rootfs (Ubuntu)
     Importance: Critical
         Status: Invalid

** Affects: livecd-rootfs (Ubuntu Bionic)
     Importance: Critical
     Assignee: Łukasz Zemczak (sil2100)
         Status: In Progress

** Also affects: livecd-rootfs (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: ubuntu-image

** Changed in: livecd-rootfs (Ubuntu)
   Importance: Undecided => Critical

** Also affects: livecd-rootfs (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: livecd-rootfs (Ubuntu Bionic)
   Importance: Undecided => Critical

** Changed in: livecd-rootfs (Ubuntu)
       Status: New => Invalid

** Changed in: livecd-rootfs (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: livecd-rootfs (Ubuntu Bionic)
     Assignee: (unassigned) => Łukasz Zemczak (sil2100)

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https://bugs.launchpad.net/bugs/1859478

Title:
  Use the 5.3 kernel for the raspi3 bionic 18.04.4 images

Status in livecd-rootfs package in Ubuntu:
  Invalid
Status in livecd-rootfs source package in Bionic:
  In Progress

Bug description:
  [Impact]

  Currently our bionic images only support the pi2, pi3 and cm3 families
  of devices. For 18.04.4 we would also like to enable support for the
  pi4 (available in eoan+). For this to work, kernel support is required
  - this can be achieved by either backporting all the needed pi4
  patches to the 4.15 kernel *or* using the 5.3 raspi one from focal
  that has already been tested and working. We decided that using 5.3 is
  the smartest and safest bet, so for this to work we need to use a
  different kernel flavour - linux-raspi2-5.3.

  This requires a change in livecd-rootfs to pull in the new kernel
  flavour for our raspi3 images.

  [Test Case]

  Build a raspi3 classic bionic image via cdimage with -proposed
  enabled. Confirm that linux-raspi2-5.3 is used instead of linux-
  raspi2.

  [Regression Potential]

  None really. The only thing that could go wrong is that the raspi3
  images would be using the wrong kernel - but that would fail
  verification then.

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