Chromebook refusing to boot due to cgroupv1 after update

[archisman]

I downloaded the Arch Linux ARM image for this Chromebook ([url]https://archlinuxarm.org/platforms/armv8/mediatek/acer-chromebook-r13[/url]), and installed it in a USB drive as described in the page.

Afterwards, I rebooted, logged in, connected to wifi, and ran
[code]sudo pacman -Syu[/code]

The upgrade finished successfully. I rebooted, and the boot fails with the error message

[quote]Refusing to run under cgroup v1, SYSTEMD_CGROUP_ENABLE_LEGACY_FORCE=1 not specific on kernel command line.[/quote]

How do I fix it?

Please note that I installed the system and updated, without making any other changes.

I found a page ([url]https://wiki.archlinux.org/title/Cgroups#Tips_and_tricks[/url]) which suggests adding a kernel parameter, but I am unsure how to do that because the Arch Linux ARM image for Chromebook does not use grub.