Re: search --label not working on mmcblk

[Andrei Borzenkov]

On 26.10.2021 12:38, Matthias Schoepfer wrote:
> Hi!
> 
> I have quite a funny behavior that I am not able to grasp. I am using
> grub on an "embedded" device to switch between two root file system
> partitions (A / B update schema). To set / read the partition, I use the
> grubenv. This part works as a charm.
> 
> Now I switched to eMMC as storage. I gave it a gpt partition table and
> besides a EFI parition, I have the root partition labeled rootfs1 and
> rootfs2. Since the numbers of the devices may be different when for
> example a USB drive is attached, I am using the PARTLABELs for getting
> the root device.
> 
> While
> 
> search --label rootfs1
> 

It searches for filesystem label, not for partition label.

> finds the rootfs1, it does not find
> 
> search --label rootfs2
> 
> even if I give the correct hints. When I boot "manually" with
> (hd3,gpt3), everything works and the linux kernel is finding the root
> partition given as
> 
> root=PARTLABEL=rootfs2 rootwait
> 
> What can I do to debug this?!
> 

Show output of blkid after booting Linux with both devices connected.

> I am using grub2 as shipped with yocto hardknott:
> 
> https://alpha.gnu.org/gnu/grub/grub-2.06~rc1.tar.xz
> 
> Modules build in: boot linux ext2 fat serial part_msdos part_gpt normal
> efi_gop iso9660 search loadenv test acpi squash4 all_video multiboot2
> 
> Any help how to tackle this is appreciated.
> 
> Regards,
> 
>    Matthias
> 
> 
>