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

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

[Keshav P R]

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

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

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
>
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> https://lists.gnu.org/mailman/listinfo/grub-devel
>


-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko

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

[Keshav P R]

2012/1/18 Vladimir 'φ-coder/phcoder' Serbinenko <phcoder@gmail.com>:
> 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
>>
>> _______________________________________________
>> Grub-devel mailing list
>> Grub-devel@gnu.org
>> https://lists.gnu.org/mailman/listinfo/grub-devel
>>
>
>
> --
> Regards
> Vladimir 'φ-coder/phcoder' Serbinenko
>

So what you are saying is I have to set the root variable before
calling chainloader?

- Keshav