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Commit 6e8699f7 authored by Albin Tonnerre's avatar Albin Tonnerre Committed by Russell King
Browse files

ARM: 6026/1: ARM: Add support for LZMA-compressed kernel images 



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 (about 25% smaller with LZMA compared to GZIP)

Tested-by: default avatarMartin Michlmayr <tbm@cyrius.com>
Tested-by: default avatarPaulius Zaleckas <paulius.zaleckas@gmail.com>
Signed-off-by: default avatarAlbin Tonnerre <albin.tonnerre@free-electrons.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 5cfc8ee0

arch/arm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/arm/boot/compressed/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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 \

arch/arm/boot/compressed/decompress.c

+4 −0
Original line number Diff line number Diff line
@@ -40,6 +40,10 @@ 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);

arch/arm/boot/compressed/piggy.lzma.S

0 → 100644
+6 −0
Original line number Diff line number Diff line 
	.section .piggydata,#alloc

	.globl	input_data

input_data:

	.incbin	"arch/arm/boot/compressed/piggy.lzma"

	.globl	input_data_end

input_data_end: