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Re: EFI NVMe Grub does not see any disk

From: Manuel Lauss
Subject: Re: EFI NVMe Grub does not see any disk
Date: Wed, 19 Apr 2017 19:31:53 +0200

Hi Andrei,

On Wed, Apr 19, 2017 at 7:15 PM, Andrei Borzenkov <address@hidden> wrote:
> 19.04.2017 14:47, Manuel Lauss пишет:
>> Hello,
>> I'm trying to get grub running on an EFI system which only has a NVMe disk.
>> My problem is that when grub is launched by EFI (from the ESP), it
>> does not see any disks at all,
>> 'ls' just prints "(proc)" and nothing more.  Is there a way to get
>> grub to recognize the disk
>> the firmware has loaded it from?
>> It's installed this way, /boot/efi is /dev/nvme0n1p2, which is the
>> ESP. Version is 2.02_rc2
>> grub-install --efi-directory=/boot/efi --no-nvram --target=x86_64-efi
>> --compress=xz --themes="breeze" /dev/nvme0n1p2
> GRUB relies on EFI for disk access and needs BlockIO protocol on device
> so it can work with it. It may be that EFI NVMe driver on your system
> does not implement it. Can you boot EFI shell on your system? This could
> be used to verify what protocols are present for which device.

Yes EFI Shell is available, and can be used to e.g. start the grub efi binary
on the nvme device just fine.   Is there a special grub module required to
get EFI BlockIO Protocol support?


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