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Re: Using a master grub2 in UEFI

From: Ben Hildred
Subject: Re: Using a master grub2 in UEFI
Date: Sun, 29 Mar 2015 01:21:48 -0600

On Sat, Mar 28, 2015 at 5:27 PM, Barry Jackson <address@hidden> wrote:
In PC-BIOS I have always used a separate partition with it's own install of grub2 to boot into core.img of various grub2 based linux installations.

I am now trying to do the same with UEFI and have hit several issues.

grub2-install --grub-setup=/bin/true /dev/sda4
under PC-BIOS only installs grub2 to the grub2 directory with a copy of core.img in grub2/i386-pc/

Under UEFI this also makes changes in the ESP by copying /boot/grub2/x86_64-efi/core.efi as /boot/EFI/EFI/<vendor>/grubx64.efi overwriting the existing one.

How can I stop this happening?

Also, when I try to boot core.efi from another grub2 menu using something like:

menuentry 'Mageia-KDE sda4' {
search --no-floppy --label --set=root KDEMga4
multiboot /boot/grub2/x86_64-efi/core.efi
core.efi is efi not multiboot. 

I get an error: no multiboot header found

Any help would be much appreciated.


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