Re: [isar-cip-core][PATCH v1 0/5] Add support for delta kernel binary update

[Jan Kiszka <jan.kiszka@siemens.com>]

On 13.08.25 15:46, Shivanand Kunijadar wrote:
> This patch series enables the delta kernel binary updates along with
> rootfs. When rdiff is selected it generates deltas for both kernel and rootfs.
> 
> In the CI, we just change PV value to 2.0 for the second image and there
> is no change (code) in the kernel binary at the moment. Do you think building
> the second image with RT kernel is appropriate here to verify delta
> kernel updates? 

Right, we may need a better delta example for the kernel. I originally
chose that (prior to delta updates) for having changes both in the
kernel and the rootfs that have to correlate. But we actually already
have a link because the ID or hash of the rootfs needs to be stored in
the UKI and, thus, updated in lock-step with the image.

For delta demonstration, we likely need a small change in the rootfs
only. Maybe enable/disable CONFIG_IMAGE_TESTING / kas/opt/test.yml? Or
something artificial and truly small, but that would clutter our menu...

Jan

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