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Linux/usr/Kconfig

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Diff markup

Differences between /usr/Kconfig (Version linux-6.11.5) and /usr/Kconfig (Version linux-2.6.32.71)


  1 # SPDX-License-Identifier: GPL-2.0             << 
  2 #                                                   1 #
  3 # Configuration for initramfs                       2 # Configuration for initramfs
  4 #                                                   3 #
  5                                                     4 
  6 config INITRAMFS_SOURCE                             5 config INITRAMFS_SOURCE
  7         string "Initramfs source file(s)"           6         string "Initramfs source file(s)"
  8         default ""                                  7         default ""
  9         help                                        8         help
 10           This can be either a single cpio arc      9           This can be either a single cpio archive with a .cpio suffix or a
 11           space-separated list of directories      10           space-separated list of directories and files for building the
 12           initramfs image.  A cpio archive sho     11           initramfs image.  A cpio archive should contain a filesystem archive
 13           to be used as an initramfs image.  D     12           to be used as an initramfs image.  Directories should contain a
 14           filesystem layout to be included in      13           filesystem layout to be included in the initramfs image.  Files
 15           should contain entries according to      14           should contain entries according to the format described by the
 16           "usr/gen_init_cpio" program in the k     15           "usr/gen_init_cpio" program in the kernel tree.
 17                                                    16 
 18           When multiple directories and files      17           When multiple directories and files are specified then the
 19           initramfs image will be the aggregat     18           initramfs image will be the aggregate of all of them.
 20                                                    19 
 21           See <file:Documentation/driver-api/e !!  20           See <file:Documentation/early-userspace/README> for more details.
 22                                                    21 
 23           If you are not sure, leave it blank.     22           If you are not sure, leave it blank.
 24                                                    23 
 25 config INITRAMFS_FORCE                         << 
 26         bool "Ignore the initramfs passed by t << 
 27         depends on CMDLINE_EXTEND || CMDLINE_F << 
 28         help                                   << 
 29           This option causes the kernel to ign << 
 30           (or initrd image) passed to it by th << 
 31           analogous to CMDLINE_FORCE, which is << 
 32           and is useful if you cannot or don't << 
 33           your bootloader passes to the kernel << 
 34                                                << 
 35 config INITRAMFS_ROOT_UID                          24 config INITRAMFS_ROOT_UID
 36         int "User ID to map to 0 (user root)"      25         int "User ID to map to 0 (user root)"
 37         depends on INITRAMFS_SOURCE!=""            26         depends on INITRAMFS_SOURCE!=""
 38         default "0"                                27         default "0"
 39         help                                       28         help
 40           If INITRAMFS_SOURCE points to a dire !!  29           This setting is only meaningful if the INITRAMFS_SOURCE is
 41           (-1 = current user) will be owned by !!  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.
 42                                                    33 
 43           If you are not sure, leave it set to     34           If you are not sure, leave it set to "0".
 44                                                    35 
 45 config INITRAMFS_ROOT_GID                          36 config INITRAMFS_ROOT_GID
 46         int "Group ID to map to 0 (group root)     37         int "Group ID to map to 0 (group root)"
 47         depends on INITRAMFS_SOURCE!=""            38         depends on INITRAMFS_SOURCE!=""
 48         default "0"                                39         default "0"
 49         help                                       40         help
 50           If INITRAMFS_SOURCE points to a dire !!  41           This setting is only meaningful if the INITRAMFS_SOURCE is
 51           (-1 = current group) will be owned b !!  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.
 52                                                    45 
 53           If you are not sure, leave it set to     46           If you are not sure, leave it set to "0".
 54                                                    47 
 55 config RD_GZIP                                     48 config RD_GZIP
 56         bool "Support initial ramdisk/ramfs co !!  49         bool "Support initial ramdisks compressed using gzip" if EMBEDDED
 57         default y                                  50         default y
                                                   >>  51         depends on BLK_DEV_INITRD
 58         select DECOMPRESS_GZIP                     52         select DECOMPRESS_GZIP
 59         help                                       53         help
 60           Support loading of a gzip encoded in     54           Support loading of a gzip encoded initial ramdisk or cpio buffer.
 61           If unsure, say Y.                        55           If unsure, say Y.
 62                                                    56 
 63 config RD_BZIP2                                    57 config RD_BZIP2
 64         bool "Support initial ramdisk/ramfs co !!  58         bool "Support initial ramdisks compressed using bzip2" if EMBEDDED
 65         default y                              !!  59         default !EMBEDDED
                                                   >>  60         depends on BLK_DEV_INITRD
 66         select DECOMPRESS_BZIP2                    61         select DECOMPRESS_BZIP2
 67         help                                       62         help
 68           Support loading of a bzip2 encoded i     63           Support loading of a bzip2 encoded initial ramdisk or cpio buffer
 69           If unsure, say N.                        64           If unsure, say N.
 70                                                    65 
 71 config RD_LZMA                                     66 config RD_LZMA
 72         bool "Support initial ramdisk/ramfs co !!  67         bool "Support initial ramdisks compressed using LZMA" if EMBEDDED
 73         default y                              !!  68         default !EMBEDDED
                                                   >>  69         depends on BLK_DEV_INITRD
 74         select DECOMPRESS_LZMA                     70         select DECOMPRESS_LZMA
 75         help                                       71         help
 76           Support loading of a LZMA encoded in     72           Support loading of a LZMA encoded initial ramdisk or cpio buffer
 77           If unsure, say N.                        73           If unsure, say N.
 78                                                    74 
 79 config RD_XZ                                   << 
 80         bool "Support initial ramdisk/ramfs co << 
 81         default y                              << 
 82         select DECOMPRESS_XZ                   << 
 83         help                                   << 
 84           Support loading of a XZ encoded init << 
 85           If unsure, say N.                    << 
 86                                                << 
 87 config RD_LZO                                  << 
 88         bool "Support initial ramdisk/ramfs co << 
 89         default y                              << 
 90         select DECOMPRESS_LZO                  << 
 91         help                                   << 
 92           Support loading of a LZO encoded ini << 
 93           If unsure, say N.                    << 
 94                                                << 
 95 config RD_LZ4                                  << 
 96         bool "Support initial ramdisk/ramfs co << 
 97         default y                              << 
 98         select DECOMPRESS_LZ4                  << 
 99         help                                   << 
100           Support loading of a LZ4 encoded ini << 
101           If unsure, say N.                    << 
102                                                << 
103 config RD_ZSTD                                 << 
104         bool "Support initial ramdisk/ramfs co << 
105         default y                              << 
106         select DECOMPRESS_ZSTD                 << 
107         help                                   << 
108           Support loading of a ZSTD encoded in << 
109           If unsure, say N.                    << 
110                                                << 
111 choice                                             75 choice
112         prompt "Built-in initramfs compression !!  76         prompt "Built-in initramfs compression mode" if INITRAMFS_SOURCE!=""
113         depends on INITRAMFS_SOURCE != ""      << 
114         help                                       77         help
115           This option allows you to decide by  !!  78           This option decides by which algorithm the builtin initramfs
116           initramfs will be compressed.  Sever !!  79           will be compressed.  Several compression algorithms are
117           available, which differ in efficienc     80           available, which differ in efficiency, compression and
118           decompression speed.  Compression sp     81           decompression speed.  Compression speed is only relevant
119           when building a kernel.  Decompressi     82           when building a kernel.  Decompression speed is relevant at
120           each boot. Also the memory usage dur !!  83           each boot.
121           relevant on memory constrained syste !!  84 
122           dictionary size of the algorithm wit !!  85           If you have any problems with bzip2 or LZMA compressed
123           featuring large dictionary sizes.    !!  86           initramfs, mail me (Alain Knaff) <alain@knaff.lu>.
124                                                    87 
125           High compression options are mostly      88           High compression options are mostly useful for users who are
126           low on RAM, since it reduces the mem     89           low on RAM, since it reduces the memory consumption during
127           boot.                                    90           boot.
128                                                    91 
129           Keep in mind that your build system  !!  92           If in doubt, select 'gzip'
130           compression tool to compress the gen << 
131           embedding.                           << 
132                                                    93 
133           If in doubt, select 'None'           !!  94 config INITRAMFS_COMPRESSION_NONE
                                                   >>  95         bool "None"
                                                   >>  96         help
                                                   >>  97           Do not compress the built-in initramfs at all. This may
                                                   >>  98           sound wasteful in space, but, you should be aware that the
                                                   >>  99           built-in initramfs will be compressed at a later stage
                                                   >> 100           anyways along with the rest of the kernel, on those
                                                   >> 101           architectures that support this.
                                                   >> 102           However, not compressing the initramfs may lead to slightly
                                                   >> 103           higher memory consumption during a short time at boot, while
                                                   >> 104           both the cpio image and the unpacked filesystem image will
                                                   >> 105           be present in memory simultaneously
134                                                   106 
135 config INITRAMFS_COMPRESSION_GZIP                 107 config INITRAMFS_COMPRESSION_GZIP
136         bool "Gzip"                               108         bool "Gzip"
137         depends on RD_GZIP                        109         depends on RD_GZIP
138         help                                      110         help
139           Use the old and well tested gzip com !! 111           The old and tried gzip compression. Its compression ratio is
140           a good balance between compression r !! 112           the poorest among the 3 choices; however its speed (both
141           has a reasonable compression speed.  !! 113           compression and decompression) is the fastest.
142           supported by your build system as th << 
143           on most distros.                     << 
144                                                   114 
145 config INITRAMFS_COMPRESSION_BZIP2                115 config INITRAMFS_COMPRESSION_BZIP2
146         bool "Bzip2"                              116         bool "Bzip2"
147         depends on RD_BZIP2                       117         depends on RD_BZIP2
148         help                                      118         help
149           It's compression ratio and speed is  !! 119           Its compression ratio and speed is intermediate.
150           is slowest among the choices. The in !! 120           Decompression speed is slowest among the three.  The initramfs
151           with bzip2, in comparison to gzip. B !! 121           size is about 10% smaller with bzip2, in comparison to gzip.
152           memory. For modern kernels you will  !! 122           Bzip2 uses a large amount of memory. For modern kernels you
153           booting.                             !! 123           will need at least 8MB RAM or more for booting.
154                                                << 
155           If you choose this, keep in mind tha << 
156           available to be able to compress the << 
157                                                   124 
158 config INITRAMFS_COMPRESSION_LZMA                 125 config INITRAMFS_COMPRESSION_LZMA
159         bool "LZMA"                               126         bool "LZMA"
160         depends on RD_LZMA                        127         depends on RD_LZMA
161         help                                      128         help
162           This algorithm's compression ratio i !! 129           The most recent compression algorithm.
163           size which might cause issues in mem !! 130           Its ratio is best, decompression speed is between the other
164           Decompression speed is between the o !! 131           two. Compression is slowest.  The initramfs size is about 33%
165           slowest. The initramfs size is about !! 132           smaller with LZMA in comparison to gzip.
166           comparison to gzip.                  << 
167                                                << 
168           If you choose this, keep in mind tha << 
169           or lzma tools to be able to compress << 
170                                                << 
171 config INITRAMFS_COMPRESSION_XZ                << 
172         bool "XZ"                              << 
173         depends on RD_XZ                       << 
174         help                                   << 
175           XZ uses the LZMA2 algorithm and has  << 
176           problems on memory constrained syste << 
177           30% smaller with XZ in comparison to << 
178           better than that of bzip2 but worse  << 
179           slow.                                << 
180                                                << 
181           If you choose this, keep in mind tha << 
182           tool to be able to compress the init << 
183                                                << 
184 config INITRAMFS_COMPRESSION_LZO               << 
185         bool "LZO"                             << 
186         depends on RD_LZO                      << 
187         help                                   << 
188           Its compression ratio is the second  << 
189           kernel size is about 10% bigger than << 
190           decompression speed is the second fa << 
191           is quite fast too.                   << 
192                                                << 
193           If you choose this, keep in mind tha << 
194           tool to be able to compress the init << 
195                                                << 
196 config INITRAMFS_COMPRESSION_LZ4               << 
197         bool "LZ4"                             << 
198         depends on RD_LZ4                      << 
199         help                                   << 
200           It's compression ratio is the poores << 
201           size is about 15% bigger than gzip;  << 
202           is the fastest.                      << 
203                                                << 
204           If you choose this, keep in mind tha << 
205           by default which could cause a build << 
206                                                << 
207 config INITRAMFS_COMPRESSION_ZSTD              << 
208         bool "ZSTD"                            << 
209         depends on RD_ZSTD                     << 
210         help                                   << 
211           ZSTD is a compression algorithm targ << 
212           with fast decompression speed. It wi << 
213           decompress around the same speed as  << 
214                                                << 
215           If you choose this, keep in mind tha << 
216           tool to be able to compress the init << 
217                                                << 
218 config INITRAMFS_COMPRESSION_NONE              << 
219         bool "None"                            << 
220         help                                   << 
221           Do not compress the built-in initram << 
222           in space, but, you should be aware t << 
223           compressed at a later stage anyways  << 
224           on those architectures that support  << 
225           initramfs may lead to slightly highe << 
226           short time at boot, while both the c << 
227           filesystem image will be present in  << 
228                                                   133 
229 endchoice                                         134 endchoice
                                                      

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