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Whacking UEFI into booting Ubuntu 12.04 via grub2
Want to use UEFI 2.x to load grub2-efi and then the kernel? This is /fairly/ simple if you're already booted with BIOS/CSM.
(Hopefully you left enough space to create a EFI boot partition somewhere. It can be quite small.)
1. Format disk (say /dev/sdX) with GPT label. Use gdisk.
2. Create smallish partition (64MB) with type EF00 and name 'EFI System Partition'.
3. Format partition as FAT32.
4. mkdir /efiboot and make an fstab entry to automount the small partition.
5. Mount partition.
6. mkdir -p /efiboot/EFI/grub/ /efiboot/EFI/boot/
7. apt-get install grub-efi-amd64
8. grub-install /dev/sdX
9. cp /efiboot/EFI/grub/grub.efi /efiboot/EFI/boot/bootx64.efi
10. update-grub
11. Reboot. Enter F1 setup.
12. Create boot option for fsX:\EFI\grub\grub.efi named Ubuntu, then exit setup and boot it. If your UEFI won't let you create boot options, then system will find bootx64.efi from step 9 and use that instead.
13. When you're satisfied, go back to gdisk and tell it to recreate protective MBR. This erases your legacy grub2 installation.
(Hopefully you left enough space to create a EFI boot partition somewhere. It can be quite small.)
1. Format disk (say /dev/sdX) with GPT label. Use gdisk.
2. Create smallish partition (64MB) with type EF00 and name 'EFI System Partition'.
3. Format partition as FAT32.
4. mkdir /efiboot and make an fstab entry to automount the small partition.
5. Mount partition.
6. mkdir -p /efiboot/EFI/grub/ /efiboot/EFI/boot/
7. apt-get install grub-efi-amd64
8. grub-install /dev/sdX
9. cp /efiboot/EFI/grub/grub.efi /efiboot/EFI/boot/bootx64.efi
10. update-grub
11. Reboot. Enter F1 setup.
12. Create boot option for fsX:\EFI\grub\grub.efi named Ubuntu, then exit setup and boot it. If your UEFI won't let you create boot options, then system will find bootx64.efi from step 9 and use that instead.
13. When you're satisfied, go back to gdisk and tell it to recreate protective MBR. This erases your legacy grub2 installation.