Hi @rubinstu,
Thanks for reaching out! So, in a standard Mender setup for Yocto on a Raspberry Pi, cmdline does not provide the root partition. That is chosen by u-boot, based on the current update state which is stored in the environment.
I have just given that a test build and validation run, and it seems to work as expected, with the one minor nitpick that I used scarthgap as I don’t have a kirkstone build ready at the moment.
So are you building something similar to meta-mender-community/kas/raspberrypi0-2w-64.yml at scarthgap · TheYoctoJester/meta-mender-community · GitHub? Can you give scarthgap a try eventually?
Also sharing the relevant parts of your local.conf, MACHINE and DISTRO might be helpful.
Greetz,
Josef