config BR2_TARGET_ROOTFS_CPIO bool "cpio the root filesystem (for use as an initial RAM filesystem)" help Build a cpio archive of the root filesystem. This is typically used for an initial RAM filesystem that is passed to the kernel by the bootloader. 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. If you use the cpio archive as an initial RAM filesystem, make sure the kernel contains the decompression algorithm selected here. 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. config BR2_TARGET_ROOTFS_CPIO_BZIP2 bool "bzip2" help Do compress the cpio filesystem with bzip2. config BR2_TARGET_ROOTFS_CPIO_LZMA bool "lzma" help Do compress the cpio filesystem with lzma. config BR2_TARGET_ROOTFS_CPIO_LZO bool "lzo" help Do compress the cpio filesystem with lzop. config BR2_TARGET_ROOTFS_CPIO_XZ bool "xz" help Do compress the cpio filesystem with xz. endchoice