Re: grub: eval vars for linux command / write config agnostic to other disks

[Pascal Hambourg]

Le 28/03/2020 à 21:47, Felix Miata a écrit :
> What's a LABEL or PARTLABEL or UUID for if the kernel doesn't understand it?

As I wrote, they are meant for use by an initramfs.

Without an initramfs, the kernel must mount the root filesystem by itself.
With an initramfs, the kernel mounts the initramfs and the initramfs 
mounts the root filesystem.

> OP says this: [quote]LABEL=<label> or similar are not available when choosing 
> the
> root partition.[/quote]
>
> I'd like to understand why it was said

Because the OP does not use an initramfs (no initrd line), as can be 
seen in the GRUB config.