Sebastian, please, could you install following package[1] in Tumbleweed OS and report back. This new version fixes reboot in my case. Some background information. I was using ancient SD/MMC/CompactFlash card reader to test this. Reboot happens once after _cold_ boot. It looks like even RPi vendor firmware has issues with this device too because they are few timeout messages show on the HDMI monitor connected to device. [1] https://download.opensuse.org/repositories/hardware:/boot/openSUSE_Factory_ARM/aarch64/u-boot-rpiarm64-2023.04-226.1.aarch64.rpm