1359096eac
Impact: quiet Kconfig warning It appears that Kconfig simply has no way to provide defaults for entries that exist inside a conditionalized choice block. Fortunately, it turns out we don't actually ever use CONFIG_INITRAMFS_COMPRESSION_NONE, so we can just drop it for everything outside the choice block. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
134 lines
4.4 KiB
Text
134 lines
4.4 KiB
Text
#
|
|
# 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 EMBEDDED
|
|
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 EMBEDDED
|
|
default !EMBEDDED
|
|
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 EMBEDDED
|
|
default !EMBEDDED
|
|
depends on BLK_DEV_INITRD
|
|
select DECOMPRESS_LZMA
|
|
help
|
|
Support loading of a LZMA 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. Its compression ratio is
|
|
the poorest among the 3 choices; however its speed (both
|
|
compression and decompression) is the fastest.
|
|
|
|
config INITRAMFS_COMPRESSION_BZIP2
|
|
bool "Bzip2"
|
|
depends on RD_BZIP2
|
|
help
|
|
Its compression ratio and speed is intermediate.
|
|
Decompression speed is slowest among the three. 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
|
|
two. Compression is slowest. The initramfs size is about 33%
|
|
smaller with LZMA in comparison to gzip.
|
|
|
|
endchoice
|