On Fri, Mar 29, 2024 at 12:29 PM Simon Glass <sjg@xxxxxxxxxxxx> wrote: > > Add a script which produces a Flat Image Tree (FIT), a single file > containing the built kernel and associated devicetree files. > Compression defaults to gzip which gives a good balance of size and > performance. > > The files compress from about 86MB to 24MB using this approach. > > The FIT can be used by bootloaders which support it, such as U-Boot > and Linuxboot. It permits automatic selection of the correct > devicetree, matching the compatible string of the running board with > the closest compatible string in the FIT. There is no need for > filenames or other workarounds. > > Add a 'make image.fit' build target for arm64, as well. > > The FIT can be examined using 'dumpimage -l'. > > This uses the 'dtbs-list' file but processes only .dtb files, ignoring > the overlay .dtbo files. > > This features requires pylibfdt (use 'pip install libfdt'). It also > requires compression utilities for the algorithm being used. Supported > compression options are the same as the Image.xxx files. Use > FIT_COMPRESSION to select an algorithm other than gzip. > > While FIT supports a ramdisk / initrd, no attempt is made to support > this here, since it must be built separately from the Linux build. > > Signed-off-by: Simon Glass <sjg@xxxxxxxxxxxx> > --- > > Changes in v12: > - Avoid showing FIT message if V=0 Acked-by: Masahiro Yamada <masahiroy@xxxxxxxxxx> -- Best Regards Masahiro Yamada
