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Re: Boot off PCIe NVMe SSD by chain booting into its grub

From: Pascal Hambourg
Subject: Re: Boot off PCIe NVMe SSD by chain booting into its grub
Date: Sat, 1 May 2021 22:09:21 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:78.0) Gecko/20100101 Thunderbird/78.10.0

Le 01/05/2021 à 14:32, Vladilen Kozin a écrit :

- install your OS on that SSD,
- put /boot onto USB stick
- copy over whatever incantation /dev/SSD/boot/grub/grub.cfg has to
load the kernel and initrd,
- but also copy your kernel ash initrd image over to /boot/ on that
USB and have Grub boot into that.

You do not have to copy anything. Just mount a USB drive partition as /boot at installation time, and install GRUB in that drive MBR.

So, instead I would like to also employ indirection but somehow chain
into Grub installed on that SSD. That's probably not Grub's own
"chain" cause it still won't see that drive.


Maybe I could put some
kernel / initrd on USB that would boot with those drives visible and
then have it run Grub on SSD somehow?

The kernel cannot run the boot loader. It only works the other way around.

Or maybe I can load a kernel and
initrd into memory which will probe and find that drive and then Grub
would be able to see somehow?

You may be able to do this with kexec.

Or maybe there's some magical Grub module already that can find these

AFAIK GRUB has no native NVMe driver yet.

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