On Sat, Apr 09, 2022 at 11:39:40AM +0800, Tiezhu Yang wrote: > root=UUID or root=LABEL is not supported without initrd. > It is better to update description of root= to explicitly > tell the users. These are not supported at all by the kernel. Maybe some code running in an initramfs might do some magic with these, but they have no meaning for the kernel and shouldn't really be documented here.