Without initramfs/initrd support, the following kernel command line won't work:
linux /bzImage root=UUID=666c2eee-193d-42db-a490-4c444342bd4e ro
How can I identify my root partition via UUID without the need for an initramfs/initrd?
I can't use a device name like /dev/sda1 either, because the partition resides on a USB-Stick and needs to work on different machines.