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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>
---
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
--- 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
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -65,6 +65,7 @@ SEDFLAGS = s/TEXT_START/$(ZTEXTADDR)/;s/
suffix_$(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 \
--- a/arch/arm/boot/compressed/decompress.c
+++ b/arch/arm/boot/compressed/decompress.c
@@ -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);
--- /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:
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