UAPI.5 Unified Kernel Images | UAPI Group Specifications
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UAPI.5 Unified Kernel Images (UKI)# Version Changes 1.0 Initial Release A Unified Kernel Image (UKI) is a combination of an UEFI boot stub program, a Linux kernel image, an optional initrd, and further resources in a single UEFI PE file. This file can either be directly invoked by the UEFI firmware (which is useful in particular in some cloud/Confidential Computing environments) or through a boot loader (which is generally useful to allow multiple kernel versions with interactive or automatic selection of version to boot into).