## Configuration for initramfs# config INITRAMFS_SOURCE	string "Initramfs source file(s)"	default ""	help	  This can be either a single cpio archive with a .cpio suffix or a	  space-separated list of directories and files for building the	  initramfs image.  A cpio archive should contain a filesystem archive	  to be used as an initramfs image.  Directories should contain a	  filesystem layout to be included in the initramfs image.  Files	  should contain entries according to the format described by the	  "usr/gen_init_cpio" program in the kernel tree. 	  When multiple directories and files are specified then the	  initramfs image will be the aggregate of all of them. 	  See <file:Documentation/early-userspace/README> for more details. 	  If you are not sure, leave it blank. config INITRAMFS_ROOT_UID	int "User ID to map to 0 (user root)"	depends on INITRAMFS_SOURCE!=""	default "0"	help	  This setting is only meaningful if the INITRAMFS_SOURCE is	  contains a directory.  Setting this user ID (UID) to something	  other than "0" will cause all files owned by that UID to be	  owned by user root in the initial ramdisk image. 	  If you are not sure, leave it set to "0". config INITRAMFS_ROOT_GID	int "Group ID to map to 0 (group root)"	depends on INITRAMFS_SOURCE!=""	default "0"	help	  This setting is only meaningful if the INITRAMFS_SOURCE is	  contains a directory.  Setting this group ID (GID) to something	  other than "0" will cause all files owned by that GID to be	  owned by group root in the initial ramdisk image. 	  If you are not sure, leave it set to "0". config RD_GZIP	bool "Support initial ramdisks compressed using gzip" if EXPERT	default y	depends on BLK_DEV_INITRD	select DECOMPRESS_GZIP	help	  Support loading of a gzip encoded initial ramdisk or cpio buffer.	  If unsure, say Y. config RD_BZIP2	bool "Support initial ramdisks compressed using bzip2" if EXPERT	default !EXPERT	depends on BLK_DEV_INITRD	select DECOMPRESS_BZIP2	help	  Support loading of a bzip2 encoded initial ramdisk or cpio buffer	  If unsure, say N. config RD_LZMA	bool "Support initial ramdisks compressed using LZMA" if EXPERT	default !EXPERT	depends on BLK_DEV_INITRD	select DECOMPRESS_LZMA	help	  Support loading of a LZMA encoded initial ramdisk or cpio buffer	  If unsure, say N. config RD_XZ	bool "Support initial ramdisks compressed using XZ" if EXPERT	default !EXPERT	depends on BLK_DEV_INITRD	select DECOMPRESS_XZ	help	  Support loading of a XZ encoded initial ramdisk or cpio buffer.	  If unsure, say N. config RD_LZO	bool "Support initial ramdisks compressed using LZO" if EXPERT	default !EXPERT	depends on BLK_DEV_INITRD	select DECOMPRESS_LZO	help	  Support loading of a LZO encoded initial ramdisk or cpio buffer	  If unsure, say N. choice	prompt "Built-in initramfs compression mode" if INITRAMFS_SOURCE!=""	help	  This option decides by which algorithm the builtin initramfs	  will be compressed.  Several compression algorithms are	  available, which differ in efficiency, compression and	  decompression speed.  Compression speed is only relevant	  when building a kernel.  Decompression speed is relevant at	  each boot. 	  If you have any problems with bzip2 or LZMA compressed	  initramfs, mail me (Alain Knaff) <alain@knaff.lu>. 	  High compression options are mostly useful for users who are	  low on RAM, since it reduces the memory consumption during	  boot. 	  If in doubt, select 'gzip' config INITRAMFS_COMPRESSION_NONE	bool "None"	help	  Do not compress the built-in initramfs at all. This may	  sound wasteful in space, but, you should be aware that the	  built-in initramfs will be compressed at a later stage	  anyways along with the rest of the kernel, on those	  architectures that support this.	  However, not compressing the initramfs may lead to slightly	  higher memory consumption during a short time at boot, while	  both the cpio image and the unpacked filesystem image will	  be present in memory simultaneously config INITRAMFS_COMPRESSION_GZIP	bool "Gzip"	depends on RD_GZIP	help	  The old and tried gzip compression. It provides a good balance	  between compression ratio and decompression speed. config INITRAMFS_COMPRESSION_BZIP2	bool "Bzip2"	depends on RD_BZIP2	help	  Its compression ratio and speed is intermediate.	  Decompression speed is slowest among the four.  The initramfs	  size is about 10% smaller with bzip2, in comparison to gzip.	  Bzip2 uses a large amount of memory. For modern kernels you	  will need at least 8MB RAM or more for booting. config INITRAMFS_COMPRESSION_LZMA	bool "LZMA"	depends on RD_LZMA	help	  The most recent compression algorithm.	  Its ratio is best, decompression speed is between the other	  three. Compression is slowest. The initramfs size is about 33%	  smaller with LZMA in comparison to gzip. config INITRAMFS_COMPRESSION_XZ	bool "XZ"	depends on RD_XZ	help	  XZ uses the LZMA2 algorithm. The initramfs size is about 30%	  smaller with XZ in comparison to gzip. Decompression speed	  is better than that of bzip2 but worse than gzip and LZO.	  Compression is slow. config INITRAMFS_COMPRESSION_LZO	bool "LZO"	depends on RD_LZO	help	  Its compression ratio is the poorest among the four. The kernel	  size is about 10% bigger than gzip; however its speed	  (both compression and decompression) is the fastest. endchoice