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

[Dave Jones]

I've put together an update for flash-kernel that handles booting an
uncompressed image (to support existing arm64 installs), a self-
compressed image (to support existing armhf installs), and a gzip'd
image (to support the proposed format). It assumes the kernel is called
"vmlinuz" in all cases (because that's currently the case, and I presume
will continue to be the case in future).

Just finishing up testing today, but I've already confirmed it works on
pi2, pi3, and pi3+ with all (supported) kernel cases - just cm3 and cm3+
to go. The update also switches the pi2 case to using the same boot-
script as all the rest. I'll ping Lukasz for a review when everything's
confirmed as working.

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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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