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EFI stub
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Introduction
EFI stub allows you to boot Linux kernel directly from UEFI. It is simple and fast alternative to using separate boot loader.
Configure kernel
Configure kernel to use UEFI stub.
Under Processor type and features:
[*] EFI runtime service support [*] EFI stub support [*] Built-in kernel command line (root=/dev/sda3 rootfstype=ext4 net.ifnames=0) Built-in kernel command string
Make UEFI boot partition
Create a 500MB partition on /dev/sda1 using gdisk.
root # gdisk /dev/sda Command: n ↵ Partition Number: 1 ↵ First sector: ↵ Last sector: +500M ↵ Hex Code: EF00
Format the partition to FAT32.
root # mkfs.vfat -F 32 /dev/sda1
Copy kernel to boot partition
Kernel filename has to end with .efi for UEFI to detect it.
root # cp arch/x86/boot/bzImage /boot/linux.efi
Make UEFI boot entry
UEFI boot entry can be made with sys-boot/efibootmgr
root # emerge -av efibootmgr root # efibootmgr -c -d /dev/sda -p 1 -L "Funtoo Linux" -l "\linux.efi"