This patch need the Compressed kernel support for MIPS and the support of LZO-compressed kernel, both of them are not available in the official kernel yet, but you can get them in the following links respectively: [PATCH -v2] MIPS: add support for gzip/bzip2/lzma compressed kernel image http://www.linux-mips.org/archives/linux-mips/2009-10/msg00110.html [PATCH v2.1 2/5] Add support for LZO-compressed kernels http://marc.info/?l=linux-kernel&m=125525500919174&w=2 The advantage of this algorithm: Uncompressed size: 3.24Mo gzip 1.61Mo 0.72s lzo 1.75Mo 0.48s and what about the compression ratio? $ ls -sh vmlinux (original) 6.0M vmlinux $ ls -sh vmlinuz (lzma) 1.2M vmlinuz $ ls -sh vmlinuz (bzip2) 1.5M vmlinuz $ ls -sh vmlinuz (gzip) 1.6M vmlinuz $ ls -sh vmlinuz (lzop) 1.7M vmlinuz the time statisticed for gzip,bzip2,lzma from booting to printing. SIZE AVG. TIME(in 4 times) gzip 2011314 2.64 bzip2 1831170 4.0625 lzma 1470938 3.2075 so, if you want to get the best compression ratio, you are recommended to use LZMA, and if you need the fastest one, LZO is recommanded. and BTW: if you need to use the gzip,bzip2,lzma,lzo support, the corresponding tools are need to install in your machine to compress the original kernel, they are gzip,bzip2,lzma and lzop. (Thanks very much to Alexander Clouter <alex@xxxxxxxxxxxxx> for giving the information about LZO to me) Signed-off-by: Wu Zhangjin <wuzhangjin@xxxxxxxxx> --- arch/mips/Kconfig | 1 + arch/mips/boot/compressed/Makefile | 2 ++ arch/mips/boot/compressed/decompress.c | 4 ++++ 3 files changed, 7 insertions(+), 0 deletions(-) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 96bb02d..6bfab06 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1303,6 +1303,7 @@ config SYS_SUPPORTS_ZBOOT select HAVE_KERNEL_GZIP select HAVE_KERNEL_BZIP2 select HAVE_KERNEL_LZMA + select HAVE_KERNEL_LZO config SYS_SUPPORTS_ZBOOT_UART16550 bool diff --git a/arch/mips/boot/compressed/Makefile b/arch/mips/boot/compressed/Makefile index 140bd9b..d746c00 100644 --- a/arch/mips/boot/compressed/Makefile +++ b/arch/mips/boot/compressed/Makefile @@ -38,9 +38,11 @@ $(obj)/vmlinux.bin: $(KBUILD_IMAGE) suffix_$(CONFIG_KERNEL_GZIP) = gz suffix_$(CONFIG_KERNEL_BZIP2) = bz2 suffix_$(CONFIG_KERNEL_LZMA) = lzma +suffix_$(CONFIG_KERNEL_LZO) = lzo tool_$(CONFIG_KERNEL_GZIP) = gzip tool_$(CONFIG_KERNEL_BZIP2) = bzip2 tool_$(CONFIG_KERNEL_LZMA) = lzma +tool_$(CONFIG_KERNEL_LZO) = lzo $(obj)/vmlinux.$(suffix_y): $(obj)/vmlinux.bin $(call if_changed,$(tool_y)) $(Q)rm -f $< diff --git a/arch/mips/boot/compressed/decompress.c b/arch/mips/boot/compressed/decompress.c index 67330c2..6a7cbb9 100644 --- a/arch/mips/boot/compressed/decompress.c +++ b/arch/mips/boot/compressed/decompress.c @@ -79,6 +79,10 @@ void *memset(void *s, int c, size_t n) #include "../../../../lib/decompress_unlzma.c" #endif +#ifdef CONFIG_KERNEL_LZO +#include "../../../../lib/decompress_unlzo.c" +#endif + void decompress_kernel(unsigned long boot_heap_start) { int zimage_size; -- 1.6.2.1
