target/linux/mx2/patches-2.6.34/030-lzma.patch

   1 This patch allows using a kernel image compressed with LZMA on ARM.
   2 Extracting the image is fairly slow, but it might be useful on machines
   3 with a very limited amount of storage, as the size benefit is quite
   4 significant:
   5 Gzip: Data Size:    1586352 Bytes = 1549.17 kB = 1.51 MB
   6 LZMA: Data Size:    2135916 Bytes = 2085.86 kB = 2.04 MB
   7
   8 Signed-off-by: Albin Tonnerre <albin.tonnerre <at> free-electrons.com>
   9 Tested-by: Martin Michlmayr <tbm <at> cyrius.com>
  10 ---
  11 v2: Updated to apply on top of 2.6.34-rc1
  12
  13  arch/arm/Kconfig                      |    1 +
  14  arch/arm/boot/compressed/Makefile     |    1 +
  15  arch/arm/boot/compressed/decompress.c |    4 ++++
  16  arch/arm/boot/compressed/piggy.lzma.S |    6 ++++++
  17  4 files changed, 12 insertions(+), 0 deletions(-)
  18  create mode 100644 arch/arm/boot/compressed/piggy.lzma.S
  19
  20 diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
  21 index 3b18128..3ebc7c3 100644
  22 --- a/arch/arm/Kconfig
  23 +++ b/arch/arm/Kconfig
  24 @@ -21,6 +21,7 @@ config ARM
  25         select HAVE_GENERIC_DMA_COHERENT
  26         select HAVE_KERNEL_GZIP
  27         select HAVE_KERNEL_LZO
  28 +       select HAVE_KERNEL_LZMA
  29         select HAVE_PERF_EVENTS
  30         select PERF_USE_VMALLOC
  31         help
  32 diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
  33 index 97c89e7..53faa90 100644
  34 --- a/arch/arm/boot/compressed/Makefile
  35 +++ b/arch/arm/boot/compressed/Makefile
  36 @@ -65,6 +65,7 @@ SEDFLAGS      = s/TEXT_START/$(ZTEXTADDR)/;s/BSS_START/$(ZBSSADDR)/
  37
  38  suffix_$(CONFIG_KERNEL_GZIP) = gzip
  39  suffix_$(CONFIG_KERNEL_LZO)  = lzo
  40 +suffix_$(CONFIG_KERNEL_LZMA) = lzma
  41
  42  targets       := vmlinux vmlinux.lds \
  43                  piggy.$(suffix_y) piggy.$(suffix_y).o \
  44 diff --git a/arch/arm/boot/compressed/decompress.c b/arch/arm/boot/compressed/decompress.c
  45 index 0da382f..d554df6 100644
  46 --- a/arch/arm/boot/compressed/decompress.c
  47 +++ b/arch/arm/boot/compressed/decompress.c
  48 @@ -39,6 +39,10 @@ extern void error(char *);
  49  #include "../../../../lib/decompress_unlzo.c"
  50  #endif
  51
  52 +#ifdef CONFIG_KERNEL_LZMA
  53 +#include "../../../../lib/decompress_unlzma.c"
  54 +#endif
  55 +
  56  void do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
  57  {
  58         decompress(input, len, NULL, NULL, output, NULL, error);
  59 diff --git a/arch/arm/boot/compressed/piggy.lzma.S b/arch/arm/boot/compressed/piggy.lzma.S
  60 new file mode 100644
  61 index 0000000..d7e69cf
  62 --- /dev/null
  63 +++ b/arch/arm/boot/compressed/piggy.lzma.S
  64 @@ -0,0 +1,6 @@
  65 +       .section .piggydata,#alloc
  66 +       .globl  input_data
  67 +input_data:
  68 +       .incbin "arch/arm/boot/compressed/piggy.lzma"
  69 +       .globl  input_data_end
  70 +input_data_end:
  71 --
  72 1.7.0
  73