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

[Paolo Pisati]

On the kernel side, the switch to a compressed kernel is a trivial
change:

diff --git a/debian.raspi2/rules.d/arm64.mk b/debian.raspi2/rules.d/arm64.mk
index ada61b8..9f82433 100644
--- a/debian.raspi2/rules.d/arm64.mk
+++ b/debian.raspi2/rules.d/arm64.mk
@@ -3,7 +3,7 @@ build_arch      = arm64
 header_arch    = arm64
 defconfig      = defconfig
 flavours       = raspi2
-build_image    = Image
+build_image    = Image.gz
 kernel_file    = arch/$(build_arch)/boot/Image
 install_file   = vmlinuz
 no_dumpfile    = true

Feel free to send such a change to the kernel ml once userspace issues
(classic and core) are sorted out.

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https://bugs.launchpad.net/bugs/1808056

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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