I wanted to verify that the rootfs encryption was done correctly, so I edited /etc/crypttab in the initrd and intentionally changed the UUID value to the wrong value.
I then rebooted and there were no errors at boot time and the rootfs mounted correctly.
I expected the error to occur after the reboot.
I encrypted the rootfs in the eMMC.
Is there any such thing as not using the /etc/crypttab setting in eMMC rootfs encryption?