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kdcadet
n00b
Joined: 19 Jan 2020
Posts: 8
Location: USA
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 Posted: Mon Feb 10, 2020 12:47 pm Post subject: Installing GRUB2 > existing EFI stub kernel to LVM/LUKS |
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Sakaki,
First of all, I'd like to thank you for your amazing EFI install guide. I have used it on two machines thus far and am very please with the results. Thank you for the work you put into helping all of us trying to get into the Gentoo world!
When I installed on my laptop things went perfectly (well apart from some naturally occurring hick-ups). When booting with the USB key inserted, Gentoo starts and prompts for the passphrase. When booting with the USB key missing Windows starts. This is ideal dual boot functionality.
However, my desktop is being a bit more difficult. It does not remember the USB key being at the top of the boot order so I have to change the settings each time I want to switch OS. I have since reinistalled and chosen to install the ESP on the internal drive. I would like to install GRUB2 to provide a boot menu on startup. When I installed GRUB2 it did not install without adding the GRUB_ENABLE_CRYPTODISK variable set to YES. I then rebooted, it prompted me for passphrase, and failed to open LUKS.
I was hoping GRUB2 could simply point to the Linux stub kernel I created using your buildkernel script. That way GRUB2 would not need to know that LUKS is even in place. Does GRUB need more than just what is contained in the .efi file to startup? If so, is there a way to put all those resources in the unencrypted ESP so that GRUB can startup without needing to access the LUKS/LVM file system?
Thank you in advance for any assistance or suggestions! |
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rufnut
Apprentice
Joined: 16 May 2005
Posts: 252
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| Posted: Mon Feb 10, 2020 1:51 pm Post subject: |
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Hi,
First part sounds like it could be fixed with a BIOS order setting.
You can also adjust the order as in this article.:
https://wiki.gentoo.org/wiki/Efibootmgr
| kdcadet wrote: | Sakaki,
it prompted me for passphrase, and failed to open LUKS.
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sounds like that is a LUKS issue but from memory certain modules are used by grub as well e.g.:
| Code: | insmod part_gpt
insmod cryptodisk
insmod luks
insmod gcry_rijndael
insmod gcry_rijndael
insmod gcry_sha1
insmod lvm
insmod ext2
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hope this helps.
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kdcadet
n00b
Joined: 19 Jan 2020
Posts: 8
Location: USA
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| Posted: Mon Feb 10, 2020 3:01 pm Post subject: |
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Simply editing the boot order does not fix my issue. Or rather, I can edit the boot order each time I want to switch from one OS to the other, but that is not my first choice of how to go about things. I would like to set things up so that I can choose on startup which OS to start.
Is it possible to load grub, and thereby the boot menu, without unlocking the drive? |
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rufnut
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Joined: 16 May 2005
Posts: 252
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rufnut
Apprentice
Joined: 16 May 2005
Posts: 252
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| Posted: Mon Feb 10, 2020 3:48 pm Post subject: |
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| kdcadet wrote: | | Is it possible to load grub, and thereby the boot menu, without unlocking the drive? |
Sure is that is what confused me on your setup.
The only direct boot setup I had like your was with gummiboot now called:
https://wiki.gentoo.org/wiki/Systemd-boot << I don't use systemd though |
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