decompressors: add boot-time XZ support

[cascardo/linux.git] / usr / Kconfig

diff --git a/usr/Kconfig b/usr/Kconfig
index e2721f5..4780dea 100644 (file)
--- a/usr/Kconfig
+++ b/usr/Kconfig
@@ -72,6 +72,15 @@ config RD_LZMA
          Support loading of a LZMA encoded initial ramdisk or cpio buffer
          If unsure, say N.
 
+config RD_XZ
+       bool "Support initial ramdisks compressed using XZ" if EMBEDDED
+       default !EMBEDDED
+       depends on BLK_DEV_INITRD
+       select DECOMPRESS_XZ
+       help
+         Support loading of a XZ encoded initial ramdisk or cpio buffer.
+         If unsure, say N.
+
 config RD_LZO
        bool "Support initial ramdisks compressed using LZO" if EMBEDDED
        default !EMBEDDED
@@ -139,12 +148,21 @@ config INITRAMFS_COMPRESSION_LZMA
          three. Compression is slowest. The initramfs size is about 33%
          smaller with LZMA in comparison to gzip.
 
+config INITRAMFS_COMPRESSION_XZ
+       bool "XZ"
+       depends on RD_XZ
+       help
+         XZ uses the LZMA2 algorithm. The initramfs size is about 30%
+         smaller with XZ in comparison to gzip. Decompression speed
+         is better than that of bzip2 but worse than gzip and LZO.
+         Compression is slow.
+
 config INITRAMFS_COMPRESSION_LZO
        bool "LZO"
        depends on RD_LZO
        help
          Its compression ratio is the poorest among the four. The kernel
-         size is about about 10% bigger than gzip; however its speed
+         size is about 10% bigger than gzip; however its speed
          (both compression and decompression) is the fastest.
 
 endchoice