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 --- a/arch/arm/Kconfig
  21 +++ b/arch/arm/Kconfig
  22 @@ -21,6 +21,7 @@ config ARM
  23         select HAVE_GENERIC_DMA_COHERENT
  24         select HAVE_KERNEL_GZIP
  25         select HAVE_KERNEL_LZO
  26 +       select HAVE_KERNEL_LZMA
  27         select HAVE_PERF_EVENTS
  28         select PERF_USE_VMALLOC
  29         help
  30 --- a/arch/arm/boot/compressed/Makefile
  31 +++ b/arch/arm/boot/compressed/Makefile
  32 @@ -65,6 +65,7 @@ SEDFLAGS      = s/TEXT_START/$(ZTEXTADDR)/;s/
  33
  34  suffix_$(CONFIG_KERNEL_GZIP) = gzip
  35  suffix_$(CONFIG_KERNEL_LZO)  = lzo
  36 +suffix_$(CONFIG_KERNEL_LZMA) = lzma
  37
  38  targets       := vmlinux vmlinux.lds \
  39                  piggy.$(suffix_y) piggy.$(suffix_y).o \
  40 --- a/arch/arm/boot/compressed/decompress.c
  41 +++ b/arch/arm/boot/compressed/decompress.c
  42 @@ -40,6 +40,10 @@ extern void error(char *);
  43  #include "../../../../lib/decompress_unlzo.c"
  44  #endif
  45
  46 +#ifdef CONFIG_KERNEL_LZMA
  47 +#include "../../../../lib/decompress_unlzma.c"
  48 +#endif
  49 +
  50  void do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
  51  {
  52         decompress(input, len, NULL, NULL, output, NULL, error);
  53 --- /dev/null
  54 +++ b/arch/arm/boot/compressed/piggy.lzma.S
  55 @@ -0,0 +1,6 @@
  56 +       .section .piggydata,#alloc
  57 +       .globl  input_data
  58 +input_data:
  59 +       .incbin "arch/arm/boot/compressed/piggy.lzma"
  60 +       .globl  input_data_end
  61 +input_data_end: