107 lines
3.3 KiB
Diff
107 lines
3.3 KiB
Diff
--- a/lib/Kconfig
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+++ b/lib/Kconfig
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@@ -126,6 +126,10 @@ config DECOMPRESS_LZMA
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config DECOMPRESS_LZMA_NEEDED
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boolean
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+config DECOMPRESS_LZO
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+ select LZO_DECOMPRESS
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+ tristate
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+
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#
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# Generic allocator support is selected if needed
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#
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--- a/lib/Makefile
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+++ b/lib/Makefile
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@@ -81,6 +81,7 @@ obj-$(CONFIG_LZMA_DECOMPRESS) += lzma/
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lib-$(CONFIG_DECOMPRESS_GZIP) += decompress_inflate.o
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lib-$(CONFIG_DECOMPRESS_BZIP2) += decompress_bunzip2.o
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lib-$(CONFIG_DECOMPRESS_LZMA) += decompress_unlzma.o
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+lib-$(CONFIG_DECOMPRESS_LZO) += decompress_unlzo.o
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obj-$(CONFIG_TEXTSEARCH) += textsearch.o
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obj-$(CONFIG_TEXTSEARCH_KMP) += ts_kmp.o
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--- a/lib/decompress.c
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+++ b/lib/decompress.c
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@@ -9,6 +9,7 @@
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#include <linux/decompress/bunzip2.h>
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#include <linux/decompress/unlzma.h>
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#include <linux/decompress/inflate.h>
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+#include <linux/decompress/unlzo.h>
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#include <linux/types.h>
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#include <linux/string.h>
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@@ -22,6 +23,9 @@
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#ifndef CONFIG_DECOMPRESS_LZMA
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# define unlzma NULL
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#endif
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+#ifndef CONFIG_DECOMPRESS_LZO
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+# define unlzo NULL
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+#endif
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static const struct compress_format {
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unsigned char magic[2];
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@@ -32,6 +36,7 @@ static const struct compress_format {
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{ {037, 0236}, "gzip", gunzip },
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{ {0x42, 0x5a}, "bzip2", bunzip2 },
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{ {0x5d, 0x00}, "lzma", unlzma },
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+ { {0x89, 0x4c}, "lzo", unlzo },
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{ {0, 0}, NULL, NULL }
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};
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--- a/usr/Kconfig
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+++ b/usr/Kconfig
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@@ -72,6 +72,15 @@ config RD_LZMA
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Support loading of a LZMA encoded initial ramdisk or cpio buffer
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If unsure, say N.
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+config RD_LZO
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+ bool "Support initial ramdisks compressed using LZO" if EMBEDDED
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+ default !EMBEDDED
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+ depends on BLK_DEV_INITRD && HAVE_KERNEL_LZO
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+ select DECOMPRESS_LZO
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+ help
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+ Support loading of a LZO encoded initial ramdisk or cpio buffer
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+ If unsure, say N.
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+
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choice
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prompt "Built-in initramfs compression mode" if INITRAMFS_SOURCE!=""
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help
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@@ -108,16 +117,15 @@ config INITRAMFS_COMPRESSION_GZIP
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bool "Gzip"
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depends on RD_GZIP
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help
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- The old and tried gzip compression. Its compression ratio is
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- the poorest among the 3 choices; however its speed (both
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- compression and decompression) is the fastest.
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+ The old and tried gzip compression. It provides a good balance
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+ between compression ratio and decompression speed.
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config INITRAMFS_COMPRESSION_BZIP2
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bool "Bzip2"
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depends on RD_BZIP2
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help
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Its compression ratio and speed is intermediate.
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- Decompression speed is slowest among the three. The initramfs
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+ Decompression speed is slowest among the four. The initramfs
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size is about 10% smaller with bzip2, in comparison to gzip.
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Bzip2 uses a large amount of memory. For modern kernels you
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will need at least 8MB RAM or more for booting.
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@@ -128,7 +136,15 @@ config INITRAMFS_COMPRESSION_LZMA
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help
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The most recent compression algorithm.
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Its ratio is best, decompression speed is between the other
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- two. Compression is slowest. The initramfs size is about 33%
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+ three. Compression is slowest. The initramfs size is about 33%
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smaller with LZMA in comparison to gzip.
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+config INITRAMFS_COMPRESSION_LZO
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+ bool "LZO"
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+ depends on RD_LZO
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+ help
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+ Its compression ratio is the poorest among the four. The kernel
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+ size is about about 10% bigger than gzip; however its speed
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+ (both compression and decompression) is the fastest.
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+
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endchoice
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