Translations:EFI stub/2/en
From Gentoo Wiki
The (U)EFI firmware present in many computers functions as a boot manager, allowing systems to boot by the use of a compatible EFI bootloader. By making the Linux kernel itself such a bootloader, called an EFI stub. This configuration boots without the need for secondary bootloader. This article provides instructions on configuring and installing kernels in the EFI System Partition (ESP) of a computer running in EFI mode.