diff options
Diffstat (limited to 'usr/Kconfig')
| -rw-r--r-- | usr/Kconfig | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/usr/Kconfig b/usr/Kconfig index 86cecb59dd07..588c588791e2 100644 --- a/usr/Kconfig +++ b/usr/Kconfig @@ -44,3 +44,104 @@ config INITRAMFS_ROOT_GID 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. + +if INITRAMFS_SOURCE!="" + +choice + prompt "Built-in initramfs compression mode" + 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 + +endif + +if INITRAMFS_SOURCE="" +# The builtin initramfs is so small so we don't want to bug the user... + +config INITRAMFS_COMPRESSION_NONE + bool + default y + +endif |