[PATCH v2] ARM: Add support for LZMA-compressed kernel images

[Paulius Zaleckas]

On 03/11/2010 09:24 PM, Albin Tonnerre wrote:
> 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<albin.tonnerre at free-electrons.com>
> Tested-by: Martin Michlmayr<tbm at cyrius.com>

You can add
Tested-by: Paulius Zaleckas <paulius.zaleckas at gmail.com>

I think you should submit this patch to Russell's patch system.

> ---
> 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: