Turns out this is wrong. debian itself would use vmlinuz for arm64 and
in fact also does that i.e in "linux-update-symlinks" which takes its
"stem" from

https://salsa.debian.org/kernel-team/linux-base/-/blob/master/lib/DebianLinux.pm#L79

And on the other side of the story ... debians kernel build sets the
arm64 stem

https://salsa.debian.org/kernel-team/linux/-/blob/master/debian/config/arm64/defines#L14

I will send patches.

Henning

Am Mon, 25 Jan 2021 17:31:28 +0300
schrieb Anton Mikanovich <ami...@ilbers.de>:

> We are performing gunzip from vmlinuz on arm64, so output should have
> correct naming.
>
> Signed-off-by: Anton Mikanovich <ami...@ilbers.de>
> ---
> Changes since v1:
> - Add RECIPE-API-CHANGELOG entry.
> ---
> RECIPE-API-CHANGELOG.md | 5 +++++
> meta/conf/bitbake.conf | 1 +
> meta/recipes-kernel/linux/files/debian/isar/install.tmpl | 6 +++---
> 3 files changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/RECIPE-API-CHANGELOG.md b/RECIPE-API-CHANGELOG.md
> index cc45f3f..bd8a204 100644
> --- a/RECIPE-API-CHANGELOG.md
> +++ b/RECIPE-API-CHANGELOG.md
> @@ -282,3 +282,8 @@ like /boot/efi to avoid such issues.
> ### Deprecate BUILD_DEPENDS in u-boot-custom.inc
>
> Use DEBIAN_BUILD_DEPENDS instead, to align with deb_debianize.
> +
> +### Change kernel image name for arm64
> +
> +Kernel image name for arm64 platforms is vmlinux now. Image format
> was +not changed (uncompressed executable) but now it is named
> correctly. diff --git a/meta/conf/bitbake.conf
> b/meta/conf/bitbake.conf index acce55d..9859456 100644
> --- a/meta/conf/bitbake.conf
> +++ b/meta/conf/bitbake.conf
> @@ -61,6 +61,7 @@ CACHE = "${TMPDIR}/cache"
> KERNEL_FILE ?= "vmlinuz"
> KERNEL_FILE_mipsel ?= "vmlinux"
> KERNEL_FILE_riscv64 ?= "vmlinux"
> +KERNEL_FILE_arm64 ?= "vmlinux"
>
> OVERRIDES =
> "${DISTRO_ARCH}:${COMPAT_OVERRIDE}:${MACHINE}:${DISTRO}:forcevariable"
> FILESOVERRIDES = "${DISTRO_ARCH}:${MACHINE}" diff --git
> a/meta/recipes-kernel/linux/files/debian/isar/install.tmpl
> b/meta/recipes-kernel/linux/files/debian/isar/install.tmpl index
> 8eca4c7..69fb88d 100644 ---
> a/meta/recipes-kernel/linux/files/debian/isar/install.tmpl +++
> b/meta/recipes-kernel/linux/files/debian/isar/install.tmpl @@ -26,9
> +26,9 @@ do_install() { fi krel="$(${MAKE} O=${O} -s
> --no-print-directory kernelrelease)" case "${ARCH}" in
> - mips|powerpc|riscv) kimage_path="boot/vmlinux-${krel}" ;;
> - um) kimage_path="usr/bin/vmlinux-${krel}" ;;
> - *) kimage_path="boot/vmlinuz-${krel}" ;;
> + mips|powerpc|riscv|arm64) kimage_path="boot/vmlinux-${krel}"
> ;;
> + um)
> kimage_path="usr/bin/vmlinux-${krel}" ;;
> + *) kimage_path="boot/vmlinuz-${krel}"
> ;; esac
>
> print_settings