[Bug 1808056] Re: vmlinuz is very large in arm64 -raspi2

[Łukasz Zemczak]

Thanks Paolo! We'll do that once we have everything in place. For now
Dave (the person responsible for Pi images) will do some tests to make
sure we're able to handle all the upgrade cases. But what we think will
have to happen is that we'd probably ask not to backport this change
into bionic and xenial. With snaps lacking dependency handling, it would
be too easy to actually cause machines to stop working - even if in our
gadget snaps we support loading of both compressed and uncompressed
kernels (with determining which case is currently needed), there's still
the case where someone could update only the kernel and leave an old
gadget snap. So we'd probably have to stick to uncompressed kernels for
core18, only switching to .gz in core20.

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Title:
  vmlinuz is very large in arm64 -raspi2

Status in flash-kernel package in Ubuntu:
  Confirmed
Status in linux-raspi2 package in Ubuntu:
  Triaged

Bug description:
  The debs are close to the same size:

  mwhudson at ringil:~/Downloads$ ls -l linux-image-4.15.0-1030-raspi2_4.15.0-1030.32_arm64.deb 
  -rw-rw-r-- 1 mwhudson mwhudson 5398652 Dec 12 10:42 linux-image-4.15.0-1030-raspi2_4.15.0-1030.32_arm64.deb
  mwhudson at ringil:~/Downloads$ ls -l linux-image-4.15.0-1030-raspi2_4.15.0-1030.32_armhf.deb 
  -rw-rw-r-- 1 mwhudson mwhudson 6640960 Dec 12 10:42 linux-image-4.15.0-1030-raspi2_4.15.0-1030.32_armhf.deb

  But the vmlinuz on arm64 is several times larger:

  $ dpkg-deb -c linux-image-4.15.0-1030-raspi2_4.15.0-1030.32_armhf.deb 
  -rw------- root/root   6633048 2018-12-07 06:38 ./boot/vmlinuz-4.15.0-1030-raspi2
  $ dpkg-deb -c linux-image-4.15.0-1030-raspi2_4.15.0-1030.32_arm64.deb 
  -rw------- root/root  23914504 2018-12-07 06:38 ./boot/vmlinuz-4.15.0-1030-raspi2

  This forced us to make the boot partition larger for the raspi3 b+
  arm64 image we made.

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