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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 | config RD_LZ4 |
| 94 | bool "Support initial ramdisks compressed using LZ4" if EXPERT |
| 95 | default !EXPERT |
| 96 | depends on BLK_DEV_INITRD |
| 97 | select DECOMPRESS_LZ4 |
| 98 | help |
| 99 | Support loading of a LZ4 encoded initial ramdisk or cpio buffer |
| 100 | If unsure, say N. |
| 101 | |
| 102 | choice |
| 103 | prompt "Built-in initramfs compression mode" if INITRAMFS_SOURCE!="" |
| 104 | help |
| 105 | This option decides by which algorithm the builtin initramfs |
| 106 | will be compressed. Several compression algorithms are |
| 107 | available, which differ in efficiency, compression and |
| 108 | decompression speed. Compression speed is only relevant |
| 109 | when building a kernel. Decompression speed is relevant at |
| 110 | each boot. |
| 111 | |
| 112 | If you have any problems with bzip2 or LZMA compressed |
| 113 | initramfs, mail me (Alain Knaff) <alain@knaff.lu>. |
| 114 | |
| 115 | High compression options are mostly useful for users who are |
| 116 | low on RAM, since it reduces the memory consumption during |
| 117 | boot. |
| 118 | |
| 119 | If in doubt, select 'gzip' |
| 120 | |
| 121 | config INITRAMFS_COMPRESSION_NONE |
| 122 | bool "None" |
| 123 | help |
| 124 | Do not compress the built-in initramfs at all. This may |
| 125 | sound wasteful in space, but, you should be aware that the |
| 126 | built-in initramfs will be compressed at a later stage |
| 127 | anyways along with the rest of the kernel, on those |
| 128 | architectures that support this. |
| 129 | However, not compressing the initramfs may lead to slightly |
| 130 | higher memory consumption during a short time at boot, while |
| 131 | both the cpio image and the unpacked filesystem image will |
| 132 | be present in memory simultaneously |
| 133 | |
| 134 | config INITRAMFS_COMPRESSION_GZIP |
| 135 | bool "Gzip" |
| 136 | depends on RD_GZIP |
| 137 | help |
| 138 | The old and tried gzip compression. It provides a good balance |
| 139 | between compression ratio and decompression speed. |
| 140 | |
| 141 | config INITRAMFS_COMPRESSION_BZIP2 |
| 142 | bool "Bzip2" |
| 143 | depends on RD_BZIP2 |
| 144 | help |
| 145 | Its compression ratio and speed is intermediate. |
| 146 | Decompression speed is slowest among the choices. The initramfs |
| 147 | size is about 10% smaller with bzip2, in comparison to gzip. |
| 148 | Bzip2 uses a large amount of memory. For modern kernels you |
| 149 | will need at least 8MB RAM or more for booting. |
| 150 | |
| 151 | config INITRAMFS_COMPRESSION_LZMA |
| 152 | bool "LZMA" |
| 153 | depends on RD_LZMA |
| 154 | help |
| 155 | This algorithm's compression ratio is best. |
| 156 | Decompression speed is between the other choices. |
| 157 | Compression is slowest. The initramfs size is about 33% |
| 158 | smaller with LZMA in comparison to gzip. |
| 159 | |
| 160 | config INITRAMFS_COMPRESSION_XZ |
| 161 | bool "XZ" |
| 162 | depends on RD_XZ |
| 163 | help |
| 164 | XZ uses the LZMA2 algorithm. The initramfs size is about 30% |
| 165 | smaller with XZ in comparison to gzip. Decompression speed |
| 166 | is better than that of bzip2 but worse than gzip and LZO. |
| 167 | Compression is slow. |
| 168 | |
| 169 | config INITRAMFS_COMPRESSION_LZO |
| 170 | bool "LZO" |
| 171 | depends on RD_LZO |
| 172 | help |
| 173 | Its compression ratio is the poorest among the choices. The kernel |
| 174 | size is about 10% bigger than gzip; however its speed |
| 175 | (both compression and decompression) is the fastest. |
| 176 | |
| 177 | endchoice |
| 178 |
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