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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 EMBEDDED |
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 EMBEDDED |
59 | default !EMBEDDED |
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 EMBEDDED |
68 | default !EMBEDDED |
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_LZO |
76 | bool "Support initial ramdisks compressed using LZO" if EMBEDDED |
77 | default !EMBEDDED |
78 | depends on BLK_DEV_INITRD |
79 | select DECOMPRESS_LZO |
80 | help |
81 | Support loading of a LZO encoded initial ramdisk or cpio buffer |
82 | If unsure, say N. |
83 | |
84 | choice |
85 | prompt "Built-in initramfs compression mode" if INITRAMFS_SOURCE!="" |
86 | help |
87 | This option decides by which algorithm the builtin initramfs |
88 | will be compressed. Several compression algorithms are |
89 | available, which differ in efficiency, compression and |
90 | decompression speed. Compression speed is only relevant |
91 | when building a kernel. Decompression speed is relevant at |
92 | each boot. |
93 | |
94 | If you have any problems with bzip2 or LZMA compressed |
95 | initramfs, mail me (Alain Knaff) <alain@knaff.lu>. |
96 | |
97 | High compression options are mostly useful for users who are |
98 | low on RAM, since it reduces the memory consumption during |
99 | boot. |
100 | |
101 | If in doubt, select 'gzip' |
102 | |
103 | config INITRAMFS_COMPRESSION_NONE |
104 | bool "None" |
105 | help |
106 | Do not compress the built-in initramfs at all. This may |
107 | sound wasteful in space, but, you should be aware that the |
108 | built-in initramfs will be compressed at a later stage |
109 | anyways along with the rest of the kernel, on those |
110 | architectures that support this. |
111 | However, not compressing the initramfs may lead to slightly |
112 | higher memory consumption during a short time at boot, while |
113 | both the cpio image and the unpacked filesystem image will |
114 | be present in memory simultaneously |
115 | |
116 | config INITRAMFS_COMPRESSION_GZIP |
117 | bool "Gzip" |
118 | depends on RD_GZIP |
119 | help |
120 | The old and tried gzip compression. It provides a good balance |
121 | between compression ratio and decompression speed. |
122 | |
123 | config INITRAMFS_COMPRESSION_BZIP2 |
124 | bool "Bzip2" |
125 | depends on RD_BZIP2 |
126 | help |
127 | Its compression ratio and speed is intermediate. |
128 | Decompression speed is slowest among the four. The initramfs |
129 | size is about 10% smaller with bzip2, in comparison to gzip. |
130 | Bzip2 uses a large amount of memory. For modern kernels you |
131 | will need at least 8MB RAM or more for booting. |
132 | |
133 | config INITRAMFS_COMPRESSION_LZMA |
134 | bool "LZMA" |
135 | depends on RD_LZMA |
136 | help |
137 | The most recent compression algorithm. |
138 | Its ratio is best, decompression speed is between the other |
139 | three. Compression is slowest. The initramfs size is about 33% |
140 | smaller with LZMA in comparison to gzip. |
141 | |
142 | config INITRAMFS_COMPRESSION_LZO |
143 | bool "LZO" |
144 | depends on RD_LZO |
145 | help |
146 | Its compression ratio is the poorest among the four. The kernel |
147 | size is about about 10% bigger than gzip; however its speed |
148 | (both compression and decompression) is the fastest. |
149 | |
150 | endchoice |
151 |
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