The Flattened Image Tree (FIT) specification has reached its first official v1.0 release. FIT is a container format used primarily by U-Boot on embedded systems to bundle boot components — including the Linux kernel image, device tree blobs (DTBs), and other assets — into a single file. The v1.0 spec adds security architecture documentation, DM-VERITY support for filesystem image verification, shared image data via the image-data property, multi-step loading support, and a configuration command line property. These features were technically part of v0.9 but only formally tagged now. The mainline Linux kernel has supported building ARM64 Flat Image Trees since kernel 6.10. Further major changes to the spec are still in progress.
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