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Using a master grub2 in UEFI

From: Barry Jackson
Subject: Using a master grub2 in UEFI
Date: Sat, 28 Mar 2015 23:27:23 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

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

I get an error: no multiboot header found

Any help would be much appreciated.


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