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Re: Grub2 chainloader bootmgfw.efi not working

From: Andrei Borzenkov
Subject: Re: Grub2 chainloader bootmgfw.efi not working
Date: Tue, 15 Sep 2015 06:56:46 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0

15.09.2015 01:18, Vyacheslav Gonakhchyan пишет:
I installed grub-git and efibootmgr-git and reproduced it.
If it matters could not build efivar-git so it's few month behind.

Could you please run "lsefi" in GRUB CLI and look for paths ending with HD(...). It is structured as


Do you see entry corresponding to hd1,gpt7?

Unless you have serial console you want to do

set pager=1

otherwise it will scroll too fast. Keep in mind that there is no way to abort output once started you will have to keep paging it until end. If you have serial console, could you attach output as well as "ls -l"?

Could you also boot EFI Shell and attach output of "devtree" (you can redirect to a file on ESP).

On Mon, Sep 14, 2015 at 7:42 PM, Andrei Borzenkov <address@hidden>

14.09.2015 15:36, Vyacheslav Gonakhchyan пишет:

My Grub2 is EFI. I use grub-install --target=x86_64-efi
--efi-directory=/boot/efi /dev/sda which calls efibootmgr to load
grubx64.efi into UEFI BIOS.

OK in this case message means that grub cannot find EFI handle for $root
(i.e. in your case - partition gpt7). GRUB itself needs just disk reference
and handles partitions internally. But when launching external binary it
wants to pass it reference to device where it is located which means it
must be exported and accessible by firmware.

The first step would be to try to reproduce it using upstream sources.

echo $grub_cpu $grub_platform

Sorry, can only check it later. I'm guessing x86_64, efi-64...

On Mon, Sep 14, 2015 at 4:11 PM, Andrei Borzenkov <address@hidden>

On Mon, Sep 14, 2015 at 2:36 PM, Vyacheslav Gonakhchyan
<address@hidden> wrote:

Hi, everyone!

I have dual boot config Archlinux/Windows7 and latest packages. I am


into grub rescue mode. Or use command line. I want to tell Grub2 to load
Windows Boot Loader bootmgfw.efi. Basically grub2 refuses to do it with
error "invalid root device".

Steps to reproduce:

set root=(hd1,gpt7)
chainloader /EFI/Microsoft/Boot/bootmgfw.efi

Screen is flashing with "invalid root device".

Is your grub BIOS or EFI? What are values for grub_cpu and grub_platform?

echo $grub_cpu $grub_platform

So grub2 finds bootmgfw.efi but cannot give it control. I tried every


hd1,gpt combination to no avail.  I also tried setting root to one
and loading bootmgfw.efi from another device(hd1,gpt7).
It's strange because I can load this file from shell (shellx64.efi)


UEFI BIOS without error. Any advice is appreciated.


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