I ran into a weird issue when my Raspberry Pi 4 updated itself. This Pi is setup with a Zymkey in developer mode and a LUKS encrypted system running Ubuntu Server 20. I have the unattended-updates package setup to install security updates and reboot my device. After the reboot, my device would no longer boot up. It prints a single message after the bootloader “Could not get clk -51”. I’ve since reflashed the sd card and it is now working fine.
Now like I said this system is in developer mode. It’s only a testbench and not critical, and the devices that I’ve deployed in production mode have continued to work just fine. I’m just trying to figure out what might have gone wrong and the first big difference between the devices that are working fine and this one is the mode the Zymkey is in. So while I have no clue if the Zymkey was the problem I’d like to ask the question of whether it could have been? Would the Zymkey forget a stored LUKS key if it was in dev mode?