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Currently, usr/gen_initramfs.sh takes care of all the use-cases:
[1] generates a cpio file unless CONFIG_INITRAMFS_SOURCE points to
a single cpio archive[2] If CONFIG_INITRAMFS_SOURCE is the path to a cpio archive,
use it as-is.[3] Compress the cpio file according to CONFIG_INITRAMFS_COMPRESSION_*
unless it is passed a compressed archive.To simplify the script, move [2] and [3] to usr/Makefile.
If CONFIG_INITRAMFS_SOURCE is the path to a cpio archive, there is
no need to run this shell script.For the cpio archive compression, you can re-use the rules from
scripts/Makefile.lib .Signed-off-by: Masahiro Yamada