<P> EFI Boot Stub makes it possible to boot a Linux kernel image without the use of a conventional UEFI boot loader . By masquerading itself as a PE / COFF image and appearing to the firmware as a UEFI application, an x86 kernel image with EFI Boot Stub enabled can be directly loaded and executed by a UEFI firmware . Such kernel images can still be loaded and run by BIOS - based boot loaders; thus, EFI Boot Stub allows a single kernel image to work in any boot environment . </P> <P> Linux kernel's support for the EFI Boot Stub is enabled by turning on option CONFIG_EFI_STUB (EFI stub support) during the kernel configuration . It was merged into version 3.3 of the Linux kernel mainline, released on March 18, 2012 . Gummiboot (a.k.a. systemd - boot) is a simple UEFI boot manager that loads and runs configured UEFI images, accessing only the EFI system partition . Configuration file fragments, kernel images and initrd images are required to reside on the EFI system partition, as Gummiboot does not provide support for accessing files on other partitions or file systems . Linux kernels need to be built with CONFIG_EFI_STUB enabled so they can be directly executed as UEFI images . </P> <P> The mount point for the EFI system partition is usually / boot / efi, where its content is accessible after Linux is booted . </P> <Table> <Tr> <Td> </Td> <Td> This article's factual accuracy may be compromised due to out - of - date information . Please update this article to reflect recent events or newly available information . (January 2017) </Td> </Tr> </Table>

What is /boot/efi in linux