kumquat-buildroot/target/cpio/Config.in

config BR2_TARGET_ROOTFS_CPIO
	bool "cpio the root filesystem"
	default n
	select BR2_HOST_FAKEROOT
	help
	  Build a cpio archive of the root filesystem

choice
        prompt "Compression method"
        default BR2_TARGET_ROOTFS_CPIO_NONE
        depends on BR2_TARGET_ROOTFS_CPIO
        help
          Select compressor for cpio filesystem of the root filesystem

config BR2_TARGET_ROOTFS_CPIO_NONE
        bool "no compression"
        help
         Do not compress the cpio filesystem.

config BR2_TARGET_ROOTFS_CPIO_GZIP
        bool "gzip"
        help
         Do compress the cpio filesystem with gzip.
         Note that you either have to have gzip installed on your host
         or select to build a gzip for your host. See the packages submenu.

config BR2_TARGET_ROOTFS_CPIO_BZIP2
        bool "bzip2"
        help
         Do compress the cpio filesystem with bzip2.
         Note that you either have to have bzip2 installed on your host
         or select to build a bzip2 for your host. See the packages submenu.

config BR2_TARGET_ROOTFS_CPIO_LZMA
        bool "lzma"
        help
         Do compress the cpio filesystem with lzma.
         Note that you either have to have lzma installed on your host
         or select to build a lzma for your host. See the packages submenu.

endchoice

config BR2_TARGET_ROOTFS_CPIO_COPYTO
	string "also copy the image to..."
	depends on BR2_TARGET_ROOTFS_CPIO
	default ""
	help
	  Copies the resulting image to a secondary location
	  like a tftp server's root directory.
	  
	  Example: $(IMAGE)-$(DATE).cpio$(CPIO_ROOTFS_COMPRESSOR_EXT)