How to setup efi stub

get uuid of the root partition, also set the correct disk and partition in the commands and replace with current uuid of your root partition.

# Linux zen kernel
sudo efibootmgr --create --disk /dev/nvme0n1 --part 1 --label "Arch Linux" --loader /vmlinuz-linux-zen --unicode 'root=UUID="b3e4dcc5-be66-43e6-a66c-42c5d4a25e73" rootfstype=btrfs rootflags=subvolid=256 quiet loglevel=3 systemd.show_status=auto rd.udev.log_level=3 vt.global_cursor_default=0 nmi_watchdog=0 zswap.enabled=0 nvidia-drm.modeset=1 rcutree.rcu_idle_gp_delay=1 rw initrd=\amd-ucode.img initrd=\initramfs-linux-zen.img'

# linux lts kernel
sudo efibootmgr --create --disk /dev/nvme0n1 --part 1 --label "Arch Linux Lts" --loader /vmlinuz-linux-lts --unicode 'root=UUID="b3e4dcc5-be66-43e6-a66c-42c5d4a25e73" rootfstype=btrfs rootflags=subvolid=256 quiet loglevel=3 systemd.show_status=auto rd.udev.log_level=3 vt.global_cursor_default=0 nmi_watchdog=0 zswap.enabled=0 nvidia-drm.modeset=1 rcutree.rcu_idle_gp_delay=1 rw initrd=\amd-ucode.img initrd=\initramfs-linux-lts.img'

# linux zen kernel with debug
sudo efibootmgr --create --disk /dev/nvme0n1 --part 1 --label "Arch Linux Debug" --loader /vmlinuz-linux-zen --unicode 'root=UUID="b3e4dcc5-be66-43e6-a66c-42c5d4a25e73" rootfstype=btrfs rootflags=subvolid=256 nmi_watchdog=0 zswap.enabled=0 nvidia-drm.modeset=1 rcutree.rcu_idle_gp_delay=1 rw initrd=\amd-ucode.img initrd=\initramfs-linux-zen.img'