Kconfig

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    1 #
    2 # Configuration for initramfs
    3 #
    4 
    5 config INITRAMFS_SOURCE
    6         string "Initramfs source file(s)"
    7         default ""
    8         help
    9           This can be either a single cpio archive with a .cpio suffix or a
   10           space-separated list of directories and files for building the
   11           initramfs image.  A cpio archive should contain a filesystem archive
   12           to be used as an initramfs image.  Directories should contain a
   13           filesystem layout to be included in the initramfs image.  Files
   14           should contain entries according to the format described by the
   15           "usr/gen_init_cpio" program in the kernel tree.
   16 
   17           When multiple directories and files are specified then the
   18           initramfs image will be the aggregate of all of them.
   19 
   20           See <file:Documentation/early-userspace/README> for more details.
   21 
   22           If you are not sure, leave it blank.
   23 
   24 config INITRAMFS_ROOT_UID
   25         int "User ID to map to 0 (user root)"
   26         depends on INITRAMFS_SOURCE!=""
   27         default "0"
   28         help
   29           This setting is only meaningful if the INITRAMFS_SOURCE is
   30           contains a directory.  Setting this user ID (UID) to something
   31           other than "0" will cause all files owned by that UID to be
   32           owned by user root in the initial ramdisk image.
   33 
   34           If you are not sure, leave it set to "0".
   35 
   36 config INITRAMFS_ROOT_GID
   37         int "Group ID to map to 0 (group root)"
   38         depends on INITRAMFS_SOURCE!=""
   39         default "0"
   40         help
   41           This setting is only meaningful if the INITRAMFS_SOURCE is
   42           contains a directory.  Setting this group ID (GID) to something
   43           other than "0" will cause all files owned by that GID to be
   44           owned by group root in the initial ramdisk image.
   45 
   46           If you are not sure, leave it set to "0".
   47 
   48 config RD_GZIP
   49         bool "Support initial ramdisks compressed using gzip" if EXPERT
   50         default y
   51         depends on BLK_DEV_INITRD
   52         select DECOMPRESS_GZIP
   53         help
   54           Support loading of a gzip encoded initial ramdisk or cpio buffer.
   55           If unsure, say Y.
   56 
   57 config RD_BZIP2
   58         bool "Support initial ramdisks compressed using bzip2" if EXPERT
   59         default !EXPERT
   60         depends on BLK_DEV_INITRD
   61         select DECOMPRESS_BZIP2
   62         help
   63           Support loading of a bzip2 encoded initial ramdisk or cpio buffer
   64           If unsure, say N.
   65 
   66 config RD_LZMA
   67         bool "Support initial ramdisks compressed using LZMA" if EXPERT
   68         default !EXPERT
   69         depends on BLK_DEV_INITRD
   70         select DECOMPRESS_LZMA
   71         help
   72           Support loading of a LZMA encoded initial ramdisk or cpio buffer
   73           If unsure, say N.
   74 
   75 config RD_XZ
   76         bool "Support initial ramdisks compressed using XZ" if EXPERT
   77         default !EXPERT
   78         depends on BLK_DEV_INITRD
   79         select DECOMPRESS_XZ
   80         help
   81           Support loading of a XZ encoded initial ramdisk or cpio buffer.
   82           If unsure, say N.
   83 
   84 config RD_LZO
   85         bool "Support initial ramdisks compressed using LZO" if EXPERT
   86         default !EXPERT
   87         depends on BLK_DEV_INITRD
   88         select DECOMPRESS_LZO
   89         help
   90           Support loading of a LZO encoded initial ramdisk or cpio buffer
   91           If unsure, say N.
   92 
   93 choice
   94         prompt "Built-in initramfs compression mode" if INITRAMFS_SOURCE!=""
   95         help
   96           This option decides by which algorithm the builtin initramfs
   97           will be compressed.  Several compression algorithms are
   98           available, which differ in efficiency, compression and
   99           decompression speed.  Compression speed is only relevant
  100           when building a kernel.  Decompression speed is relevant at
  101           each boot.
  102 
  103           If you have any problems with bzip2 or LZMA compressed
  104           initramfs, mail me (Alain Knaff) <alain@knaff.lu>.
  105 
  106           High compression options are mostly useful for users who are
  107           low on RAM, since it reduces the memory consumption during
  108           boot.
  109 
  110           If in doubt, select 'gzip'
  111 
  112 config INITRAMFS_COMPRESSION_NONE
  113         bool "None"
  114         help
  115           Do not compress the built-in initramfs at all. This may
  116           sound wasteful in space, but, you should be aware that the
  117           built-in initramfs will be compressed at a later stage
  118           anyways along with the rest of the kernel, on those
  119           architectures that support this.
  120           However, not compressing the initramfs may lead to slightly
  121           higher memory consumption during a short time at boot, while
  122           both the cpio image and the unpacked filesystem image will
  123           be present in memory simultaneously
  124 
  125 config INITRAMFS_COMPRESSION_GZIP
  126         bool "Gzip"
  127         depends on RD_GZIP
  128         help
  129           The old and tried gzip compression. It provides a good balance
  130           between compression ratio and decompression speed.
  131 
  132 config INITRAMFS_COMPRESSION_BZIP2
  133         bool "Bzip2"
  134         depends on RD_BZIP2
  135         help
  136           Its compression ratio and speed is intermediate.
  137           Decompression speed is slowest among the choices.  The initramfs
  138           size is about 10% smaller with bzip2, in comparison to gzip.
  139           Bzip2 uses a large amount of memory. For modern kernels you
  140           will need at least 8MB RAM or more for booting.
  141 
  142 config INITRAMFS_COMPRESSION_LZMA
  143         bool "LZMA"
  144         depends on RD_LZMA
  145         help
  146           This algorithm's compression ratio is best.
  147           Decompression speed is between the other choices.
  148           Compression is slowest. The initramfs size is about 33%
  149           smaller with LZMA in comparison to gzip.
  150 
  151 config INITRAMFS_COMPRESSION_XZ
  152         bool "XZ"
  153         depends on RD_XZ
  154         help
  155           XZ uses the LZMA2 algorithm. The initramfs size is about 30%
  156           smaller with XZ in comparison to gzip. Decompression speed
  157           is better than that of bzip2 but worse than gzip and LZO.
  158           Compression is slow.
  159 
  160 config INITRAMFS_COMPRESSION_LZO
  161         bool "LZO"
  162         depends on RD_LZO
  163         help
  164           Its compression ratio is the poorest among the choices. The kernel
  165           size is about 10% bigger than gzip; however its speed
  166           (both compression and decompression) is the fastest.
  167 
  168 endchoice

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