Re: "not a valid root device" error in UEFI chainloader command

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 18.01.2012 03:54, Keshav P R wrote:
> Hi,
>       I tried to manually chainload UEFI shell from grub2 terminal in
> x86_64 firmware. I get
>
> > insmod part_gpt
> > insmod fat
> > chainloader (hd0,gpt1)/shellx64.efi
> error: not a valid root device
Setting "root" isn't just for convenience inside GRUB, with some loader 
(multiboot, chainloader, bsd) it's actually passed to the payload as its 
root. If you forget to set it, it obviously won't work
> If I use
>
> > set pager=1
> > set debug=all
> > chainloader (hd0,gpt1)/shellx64.efi
> [long rows of text - but no visible error]
> > boot
> [shell launched]
>
> However a menuentry like
>
> menuentry "UEFI Shell" {
>         search --fs-uuid --no-floppy --set=root ${_uefi_sys_fs_uuid}
>         chainloader (${root})/shellx64.efi
> }
>
> works. I can reproduce this error everytime I try to manually
> chainload from grub2 terminal, but does not occur even once when
> loaded via menuentry. Thanks in advance.
>
> Regards.
>
> Keshav
>
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--
Regards
Vladimir 'φ-coder/phcoder' Serbinenko