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LegionOfHell
Apprentice
Joined: 16 Mar 2019
Posts: 253
Location: Toronto, Canada
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 Posted: Sun Jun 21, 2020 10:11 pm Post subject: How to chainload two EFI partitions with grub2 ? |
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I have gentoo installed on /dev/sda :
| Code: | /dev/sda1 EFI/grub2/vfat
/dev/sda2 rootfs ext4 |
and void linux installed on /dev/nvme0n1 :
| Code: | /dev/nvme0n1p1 EFI/grub2/vfat
/dev/nvme0n1p2 rootfs ext4 |
Both disks use gpt scheme!!
Should my menu entry for Void's grub in /etc/grub.d/40_custom look like this:
| Code: | menuentry "Gentoo-grub" {
insmod
set root=(hd0,1)
linux /boot/vmlinuz
initrd /boot/initrd.img
}
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or this:
| Code: | menuentry "Gentoo-grub" {
insmod part_gpt
insmod chain
chainloader (hd0,1)+1
}
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Also, for the insmod line, Do I need to load any grub modules for this to work ? what modules do I need for this setup ?
And what if i don't decide to chainload and want Gentoo to load straight from Void's grub menu ? |
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GDH-gentoo
l33t
Joined: 20 Jul 2019
Posts: 866
Location: South America
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| Posted: Mon Jun 22, 2020 2:36 am Post subject: |
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You mean the UEFI firmware starts the GRUB installed by Void in /dev/nvme0n1p1? And you want to chain load a GRUB installed by Gentoo in /dev/sda1?
If you want to do that, which I don't find very useful except for testing, I believe it should be something like:
| Code: | menuentry 'GRUB in Gentoo's disk' {
insmod part_gpt # probably not needed
insmod fat # probably not needed either
insmod chain
search --no-floppy --fs-uuid --set=root <the filesystem UUID of /dev/sda1>
echo "Chain loading GRUB in Gentoo's disk..."
chainloader /EFI/gentoo/grubx64.efi # Use the correct pathname!
} |
If you want to start Gentoo directly from the GRUB installed in /dev/nvme0n1p1, you could probably copy the relevant menuentry { ... } and submenu { ... } blocks from Gentoo's grub.cfg to Void's /etc/grub.d/40_custom, assuming they contain a search --fs-uuid command specifying the filesystem UUID of /dev/sda2. Temporarily mount the partition that contains Gentoo's /boot/grub from Void to do that easily.
EDIT: Changing the argument of the echo command to double quotes, because it contains a single quote.
Last edited by GDH-gentoo on Mon Jun 22, 2020 1:02 pm; edited 1 time in total |
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LegionOfHell
Apprentice
Joined: 16 Mar 2019
Posts: 253
Location: Toronto, Canada
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| Posted: Mon Jun 22, 2020 3:23 am Post subject: |
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| GDH-gentoo wrote: | You mean the UEFI firmware starts the GRUB installed by Void in /dev/nvme0n1p1? And you want to chain load a GRUB installed by Gentoo in /dev/sda1?
If you want to do that, which I don't find very useful except for testing, I believe it should be something like:
| Code: | menuentry 'GRUB in Gentoo's disk' {
insmod part_gpt # probably not needed
insmod fat # probably not needed either
insmod chain
search --no-floppy --fs-uuid --set=root <the filesystem UUID of /dev/sda1>
echo 'Chain loading GRUB in Gentoo's disk...'
chainloader /EFI/gentoo/grubx64.efi # Use the correct pathname!
} |
If you want to start Gentoo directly from the GRUB installed in /dev/nvme0n1p1, you could probably copy the relevant menuentry { ... } and submenu { ... } blocks from Gentoo's grub.cfg to Void's /etc/grub.d/40_custom, assuming they contain a search --fs-uuid command specifying the filesystem UUID of /dev/sda2. Temporarily mount the partition that contains Gentoo's /boot/grub from Void to do that easily. |
thanks alot. |
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Installing Gentoo
