it's possible, but you must include the path to the initramfs as a kernel parameter (using DOS-style paths, not sure if unix-style works too). A linux-aware bo

it's possible, but you must include the path to the initramfs as a kernel parameter (using DOS-style paths, not sure if unix-style works too). A linux-aware bootloader will usually load the initramfs itself and pass linux the memory address where it's loaded, in UEFI the kernel gets "executed" like a normal executable, so it has a commandline but not a pre-loaded initramfs. My efibootmgr entry looks like this (root is btrfs on LUKS): HD(disk-id)/File(\vmlinux-5.6.0-2-rt-amd64) initrd=\initrd.img-5.6.0-2-rt-amd64 ro root=/dev/mapper/cryptpv0 The latter part is what you must supply manually if you want to start the kernel from the UEFI command line.