|Summary help replacing me|
|It is well know that different motherboard manufactures implement UEFI differently. The purpose of this page is to show hardware-specific methods known to work when installing/restoring GRUB in efi mode.|
Apple Mac EFI systems
Use bless command from within Mac OS X to set
grubx64.efi as the default boot option. You can also boot from the Mac OS X install disc and launch a Terminal there if you only have Linux installed. In the Terminal, create a directory and mount the EFI System Partition:
# cd /Volumes # mkdir efi # mount -t msdos /dev/disk0s1 /Volumes/efi
Then run bless on
grub.efi and on the EFI partition to set them as the default boot options.
# bless --folder=/Volumes/efi --file=/Volumes/efi/efi/arch_grub/grubx64.efi --setBoot # bless --mount=/Volumes/efi --file=/Volumes/efi/efi/arch_grub/grubx64.efi --setBoot
Z68 Family and U47 Family
# cp /boot/efi/EFI/arch_grub/grubx64.efi /boot/efi/shellx64.efi
After this launch the UEFI Shell from the UEFI setup/menu (in ASUS UEFI BIOS, switch to advanced mode, press Exit in the top right corner and choose "Launch EFI shell from filesystem device"). The GRUB2 menu will show up and you can boot into your system. Afterwards you can use efibootmgr to setup a menu entry, for example if you have the uefi partition in /dev/sda1: (read Unified_Extensible_Firmware_Interface)
efibootmgr -c -g -d /dev/sda -p 1 -w -L "Archlinux Grub" -l '\EFI\arch_grub\grubx64.efi'
If your motherboard has no such option (or even if it does), you can use UEFI shell (Unified_Extensible_Firmware_Interface#UEFI_Shell) to create a UEFI boot option for the Arch partition temporarily.
Once you boot into the EFI shell, add a UEFI boot menu entry:
Shell> bcfg boot add 0 fs1:\EFI\arch_grub\grubx64.efi "Arch Linux (GRUB2)"
fs1 is the mapping corresponding to the UEFI System Partition and
\EFI\arch_grub\grubx64.efi is the the from the
--bootloader-id from the
grub-install command above.
This will temporarily add a UEFI boot option for the next boot to get into Arch. Once in Arch, modprobe
efivars and confirm that
efibootmgr creates no errors (no errors meaning you successfully booted in UEFI mode). Then Grub2#Install_to_UEFI_SYSTEM_PARTITION can be performed again and should successfully permanently add a boot entry in the UEFI menu.
- Boot to live media and chroot into the target system.
FROM WITHIN THE CHROOT
# mount -t vfat /dev/sdXY /boot/efi # grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=arch --recheck # grub-mkconfig -o /boot/grub/grub.cfg # mkdir /boot/efi/boot && cd /boot/efi # wget https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/ShellBinPkg/UefiShell/X64/Shell.efi # cp Shell.efi shellx64.efi && cp Shell.efi /boot/efi/boot # umount /boot/efi
- Reboot and enter the BIOS (the Delete key will do this).
- Using the arrow keys, move to the 'exit' menu and drop down to the EFI shell you just downloaded and copied to three places.
- You will need to add an entry to your boot menu manually. Below is an example, see the UEFI#Launching UEFI Shell article for more. Below is an example added a new entry to a menu with 3 current entries.
FROM WITHIN THE EFI SHELL
Shell> bcfg boot dump -v Shell> bcfg boot add 3 fs0:\EFI\arch\grubx64.efi "Arch Linux (grub manually added)" Shell> exit
- Reboot the machine and enter the BIOS.
- Navigate to the 'Boot' section and adjust the boot order to your liking with the "Arch Linux (grub manually added)" being the one on your SSD.
- Boot to this entry and enjoy your system.
Please note that this board operates on the Intel EFI v1.10 specification, and is i386 only. The normal procedure for UEFI installation can be followed, with the exception of the following changes.
- Instead of using the
grub-efi-i386has to be used
bcfgcommand is not available for pre-UEFI firmware. A
startup.nshfile can be used on the root of the EFI partition containing the path to the bootloader. For example:
grub.cfgfile has to be placed in the same directory as the grub EFI file, otherwise grub will enter the interactive shell