Diffstat (limited to 'init/Kconfig')
1 files changed, 60 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 68699137b14..14c483d2b7c 100644
@@ -101,6 +101,66 @@ config LOCALVERSION_AUTO
which is done within the script "scripts/setlocalversion".)
+ prompt "Kernel compression mode"
+ default KERNEL_GZIP
+ depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA
+ The linux kernel is a kind of self-extracting executable.
+ 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
+ kernels, mail me (Alain Knaff) <firstname.lastname@example.org>. (An older
+ version of this functionality (bzip2 only), for 2.4, was
+ supplied by Christian Ludwig)
+ High compression options are mostly useful for users, who
+ are low on disk space (embedded systems), but for whom ram
+ size matters less.
+ If in doubt, select 'gzip'
+ bool "Gzip"
+ depends on HAVE_KERNEL_GZIP
+ 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.
+ bool "Bzip2"
+ depends on HAVE_KERNEL_BZIP2
+ Its compression ratio and speed is intermediate.
+ Decompression speed is slowest among the three. The kernel
+ 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.
+ bool "LZMA"
+ depends on HAVE_KERNEL_LZMA
+ The most recent compression algorithm.
+ Its ratio is best, decompression speed is between the other
+ two. Compression is slowest. The kernel size is about 33%
+ smaller with LZMA in comparison to gzip.
bool "Support for paging of anonymous memory (swap)"
depends on MMU && BLOCK