AUM tests fail on RPi4

Background

Test case aum-offline-upgrade-branch fails on RPi4 with

AUM-Message: 16:47:24.656: Upgrade status: Unknown
Feb 26 16:47:24 apertis apertis-update-[1056]: Ostree upgrade failed: Installing kernel: regfile copy: No space left on device

https://lava.collabora.dev/scheduler/job/12867605#L8373

Reproducibility

How often the issue is hit when repeating the test and changing nothing (same device, same image, etc.)?

Put the ✅ in the most appropriate entry:

always
✅ often, but not always
rarely

Impact of bug

RPI4 cannot be upgraded from v2023 to v2024 or newer

Attachments

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Root cause

The issue seems to be caused by the fact that the boot partition is smaller in RPi4 than in the other images due to the presence of the firmare partition.

Apertis ARM64 images boot partition 256 M Apertis ARM64 RPi4 images boot partition 192 M

However, since the upgrade-branch tests flashes and old image and then tries to upgrade it, a fix in the image layout needs to be backported to the image used in the first step.