This patch allows using a kernel image compressed with LZMA on ARM. Extracting the image is fairly slow, but it might be useful on machines with a very limited amount of storage, as the size benefit is quite significant: Gzip: Data Size: 1586352 Bytes = 1549.17 kB = 1.51 MB LZMA: Data Size: 2135916 Bytes = 2085.86 kB = 2.04 MB Signed-off-by: Albin Tonnerre free-electrons.com> Tested-by: Martin Michlmayr cyrius.com> --- v2: Updated to apply on top of 2.6.34-rc1 arch/arm/Kconfig | 1 + arch/arm/boot/compressed/Makefile | 1 + arch/arm/boot/compressed/decompress.c | 4 ++++ arch/arm/boot/compressed/piggy.lzma.S | 6 ++++++ 4 files changed, 12 insertions(+), 0 deletions(-) create mode 100644 arch/arm/boot/compressed/piggy.lzma.S diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 3b18128..3ebc7c3 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -21,6 +21,7 @@ config ARM select HAVE_GENERIC_DMA_COHERENT select HAVE_KERNEL_GZIP select HAVE_KERNEL_LZO + select HAVE_KERNEL_LZMA select HAVE_PERF_EVENTS select PERF_USE_VMALLOC help diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile index 97c89e7..53faa90 100644 --- a/arch/arm/boot/compressed/Makefile +++ b/arch/arm/boot/compressed/Makefile @@ -65,6 +65,7 @@ SEDFLAGS = s/TEXT_START/$(ZTEXTADDR)/;s/BSS_START/$(ZBSSADDR)/ suffix_$(CONFIG_KERNEL_GZIP) = gzip suffix_$(CONFIG_KERNEL_LZO) = lzo +suffix_$(CONFIG_KERNEL_LZMA) = lzma targets := vmlinux vmlinux.lds \ piggy.$(suffix_y) piggy.$(suffix_y).o \ diff --git a/arch/arm/boot/compressed/decompress.c b/arch/arm/boot/compressed/decompress.c index 0da382f..d554df6 100644 --- a/arch/arm/boot/compressed/decompress.c +++ b/arch/arm/boot/compressed/decompress.c @@ -39,6 +39,10 @@ extern void error(char *); #include "../../../../lib/decompress_unlzo.c" #endif +#ifdef CONFIG_KERNEL_LZMA +#include "../../../../lib/decompress_unlzma.c" +#endif + void do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x)) { decompress(input, len, NULL, NULL, output, NULL, error); diff --git a/arch/arm/boot/compressed/piggy.lzma.S b/arch/arm/boot/compressed/piggy.lzma.S new file mode 100644 index 0000000..d7e69cf --- /dev/null +++ b/arch/arm/boot/compressed/piggy.lzma.S @@ -0,0 +1,6 @@ + .section .piggydata,#alloc + .globl input_data +input_data: + .incbin "arch/arm/boot/compressed/piggy.lzma" + .globl input_data_end +input_data_end: -- 1.7.0