| 1 | --- a/lib/Kconfig |
| 2 | +++ b/lib/Kconfig |
| 3 | @@ -126,6 +126,10 @@ config DECOMPRESS_LZMA |
| 4 | config DECOMPRESS_LZMA_NEEDED |
| 5 | boolean |
| 6 | |
| 7 | +config DECOMPRESS_LZO |
| 8 | + select LZO_DECOMPRESS |
| 9 | + tristate |
| 10 | + |
| 11 | # |
| 12 | # Generic allocator support is selected if needed |
| 13 | # |
| 14 | --- a/lib/Makefile |
| 15 | +++ b/lib/Makefile |
| 16 | @@ -81,6 +81,7 @@ obj-$(CONFIG_LZMA_DECOMPRESS) += lzma/ |
| 17 | lib-$(CONFIG_DECOMPRESS_GZIP) += decompress_inflate.o |
| 18 | lib-$(CONFIG_DECOMPRESS_BZIP2) += decompress_bunzip2.o |
| 19 | lib-$(CONFIG_DECOMPRESS_LZMA) += decompress_unlzma.o |
| 20 | +lib-$(CONFIG_DECOMPRESS_LZO) += decompress_unlzo.o |
| 21 | |
| 22 | obj-$(CONFIG_TEXTSEARCH) += textsearch.o |
| 23 | obj-$(CONFIG_TEXTSEARCH_KMP) += ts_kmp.o |
| 24 | --- a/lib/decompress.c |
| 25 | +++ b/lib/decompress.c |
| 26 | @@ -9,6 +9,7 @@ |
| 27 | #include <linux/decompress/bunzip2.h> |
| 28 | #include <linux/decompress/unlzma.h> |
| 29 | #include <linux/decompress/inflate.h> |
| 30 | +#include <linux/decompress/unlzo.h> |
| 31 | |
| 32 | #include <linux/types.h> |
| 33 | #include <linux/string.h> |
| 34 | @@ -22,6 +23,9 @@ |
| 35 | #ifndef CONFIG_DECOMPRESS_LZMA |
| 36 | # define unlzma NULL |
| 37 | #endif |
| 38 | +#ifndef CONFIG_DECOMPRESS_LZO |
| 39 | +# define unlzo NULL |
| 40 | +#endif |
| 41 | |
| 42 | static const struct compress_format { |
| 43 | unsigned char magic[2]; |
| 44 | @@ -32,6 +36,7 @@ static const struct compress_format { |
| 45 | { {037, 0236}, "gzip", gunzip }, |
| 46 | { {0x42, 0x5a}, "bzip2", bunzip2 }, |
| 47 | { {0x5d, 0x00}, "lzma", unlzma }, |
| 48 | + { {0x89, 0x4c}, "lzo", unlzo }, |
| 49 | { {0, 0}, NULL, NULL } |
| 50 | }; |
| 51 | |
| 52 | --- a/usr/Kconfig |
| 53 | +++ b/usr/Kconfig |
| 54 | @@ -72,6 +72,15 @@ config RD_LZMA |
| 55 | Support loading of a LZMA encoded initial ramdisk or cpio buffer |
| 56 | If unsure, say N. |
| 57 | |
| 58 | +config RD_LZO |
| 59 | + bool "Support initial ramdisks compressed using LZO" if EMBEDDED |
| 60 | + default !EMBEDDED |
| 61 | + depends on BLK_DEV_INITRD && HAVE_KERNEL_LZO |
| 62 | + select DECOMPRESS_LZO |
| 63 | + help |
| 64 | + Support loading of a LZO encoded initial ramdisk or cpio buffer |
| 65 | + If unsure, say N. |
| 66 | + |
| 67 | choice |
| 68 | prompt "Built-in initramfs compression mode" if INITRAMFS_SOURCE!="" |
| 69 | help |
| 70 | @@ -108,16 +117,15 @@ config INITRAMFS_COMPRESSION_GZIP |
| 71 | bool "Gzip" |
| 72 | depends on RD_GZIP |
| 73 | help |
| 74 | - The old and tried gzip compression. Its compression ratio is |
| 75 | - the poorest among the 3 choices; however its speed (both |
| 76 | - compression and decompression) is the fastest. |
| 77 | + The old and tried gzip compression. It provides a good balance |
| 78 | + between compression ratio and decompression speed. |
| 79 | |
| 80 | config INITRAMFS_COMPRESSION_BZIP2 |
| 81 | bool "Bzip2" |
| 82 | depends on RD_BZIP2 |
| 83 | help |
| 84 | Its compression ratio and speed is intermediate. |
| 85 | - Decompression speed is slowest among the three. The initramfs |
| 86 | + Decompression speed is slowest among the four. The initramfs |
| 87 | size is about 10% smaller with bzip2, in comparison to gzip. |
| 88 | Bzip2 uses a large amount of memory. For modern kernels you |
| 89 | will need at least 8MB RAM or more for booting. |
| 90 | @@ -128,7 +136,15 @@ config INITRAMFS_COMPRESSION_LZMA |
| 91 | help |
| 92 | The most recent compression algorithm. |
| 93 | Its ratio is best, decompression speed is between the other |
| 94 | - two. Compression is slowest. The initramfs size is about 33% |
| 95 | + three. Compression is slowest. The initramfs size is about 33% |
| 96 | smaller with LZMA in comparison to gzip. |
| 97 | |
| 98 | +config INITRAMFS_COMPRESSION_LZO |
| 99 | + bool "LZO" |
| 100 | + depends on RD_LZO |
| 101 | + help |
| 102 | + Its compression ratio is the poorest among the four. The kernel |
| 103 | + size is about about 10% bigger than gzip; however its speed |
| 104 | + (both compression and decompression) is the fastest. |
| 105 | + |
| 106 | endchoice |
| 107 | |
