2010-04-11 22:12:10 +00:00
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This patch allows using a kernel image compressed with LZMA on ARM.
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Extracting the image is fairly slow, but it might be useful on machines
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with a very limited amount of storage, as the size benefit is quite
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significant:
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Gzip: Data Size: 1586352 Bytes = 1549.17 kB = 1.51 MB
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LZMA: Data Size: 2135916 Bytes = 2085.86 kB = 2.04 MB
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Signed-off-by: Albin Tonnerre <albin.tonnerre <at> free-electrons.com>
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Tested-by: Martin Michlmayr <tbm <at> cyrius.com>
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---
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v2: Updated to apply on top of 2.6.34-rc1
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arch/arm/Kconfig | 1 +
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arch/arm/boot/compressed/Makefile | 1 +
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arch/arm/boot/compressed/decompress.c | 4 ++++
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arch/arm/boot/compressed/piggy.lzma.S | 6 ++++++
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4 files changed, 12 insertions(+), 0 deletions(-)
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create mode 100644 arch/arm/boot/compressed/piggy.lzma.S
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--- a/arch/arm/Kconfig
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+++ b/arch/arm/Kconfig
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@@ -21,6 +21,7 @@ config ARM
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select HAVE_GENERIC_DMA_COHERENT
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select HAVE_KERNEL_GZIP
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select HAVE_KERNEL_LZO
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+ select HAVE_KERNEL_LZMA
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select HAVE_PERF_EVENTS
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select PERF_USE_VMALLOC
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help
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--- a/arch/arm/boot/compressed/Makefile
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+++ b/arch/arm/boot/compressed/Makefile
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2010-04-22 07:13:21 +00:00
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@@ -65,6 +65,7 @@ SEDFLAGS = s/TEXT_START/$(ZTEXTADDR)/;s/
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2010-04-11 22:12:10 +00:00
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suffix_$(CONFIG_KERNEL_GZIP) = gzip
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suffix_$(CONFIG_KERNEL_LZO) = lzo
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+suffix_$(CONFIG_KERNEL_LZMA) = lzma
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2010-04-22 07:13:21 +00:00
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2010-04-11 22:12:10 +00:00
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targets := vmlinux vmlinux.lds \
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piggy.$(suffix_y) piggy.$(suffix_y).o \
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--- a/arch/arm/boot/compressed/decompress.c
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+++ b/arch/arm/boot/compressed/decompress.c
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2010-04-22 07:13:21 +00:00
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@@ -40,6 +40,10 @@ extern void error(char *);
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2010-04-11 22:12:10 +00:00
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#include "../../../../lib/decompress_unlzo.c"
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#endif
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2010-04-22 07:13:21 +00:00
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2010-04-11 22:12:10 +00:00
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+#ifdef CONFIG_KERNEL_LZMA
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+#include "../../../../lib/decompress_unlzma.c"
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+#endif
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+
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void do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
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{
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decompress(input, len, NULL, NULL, output, NULL, error);
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--- /dev/null
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+++ b/arch/arm/boot/compressed/piggy.lzma.S
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@@ -0,0 +1,6 @@
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+ .section .piggydata,#alloc
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+ .globl input_data
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+input_data:
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+ .incbin "arch/arm/boot/compressed/piggy.lzma"
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+ .globl input_data_end
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+input_data_end:
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