target/linux/generic/patches-4.9/222-arm_zimage_none.patch

   1 ARM: implement "uncompressed zImage"
   2
   3 Based on RFC patch by Uwe Kleine-König
   4 http://www.spinics.net/lists/arm-kernel/msg230153.html
   5
   6 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   7 ---
   8 --- a/arch/arm/boot/compressed/Makefile
   9 +++ b/arch/arm/boot/compressed/Makefile
  10 @@ -71,6 +71,7 @@ compress-$(CONFIG_KERNEL_LZO)  = lzo
  11  compress-$(CONFIG_KERNEL_LZMA) = lzma
  12  compress-$(CONFIG_KERNEL_XZ)   = xzkern
  13  compress-$(CONFIG_KERNEL_LZ4)  = lz4
  14 +compress-$(CONFIG_KERNEL_CAT)  = cat
  15
  16  # Borrowed libfdt files for the ATAG compatibility mode
  17
  18 --- a/arch/arm/boot/compressed/decompress.c
  19 +++ b/arch/arm/boot/compressed/decompress.c
  20 @@ -55,6 +55,10 @@ extern char * strstr(const char * s1, co
  21  #include "../../../../lib/decompress_unlz4.c"
  22  #endif
  23
  24 +#ifdef CONFIG_KERNEL_CAT
  25 +#include "../../../../lib/decompress_uncat.c"
  26 +#endif
  27 +
  28  int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
  29  {
  30         return __decompress(input, len, NULL, NULL, output, 0, NULL, error);
  31 --- /dev/null
  32 +++ b/arch/arm/boot/compressed/piggy.cat.S
  33 @@ -0,0 +1,6 @@
  34 +       .section .piggydata,#alloc
  35 +       .globl  input_data
  36 +input_data:
  37 +       .incbin "arch/arm/boot/compressed/piggy.cat"
  38 +       .globl  input_data_end
  39 +input_data_end:
  40 --- a/init/Kconfig
  41 +++ b/init/Kconfig
  42 @@ -127,6 +127,9 @@ config HAVE_KERNEL_LZO
  43  config HAVE_KERNEL_LZ4
  44         bool
  45
  46 +config HAVE_KERNEL_CAT
  47 +       bool
  48 +
  49  choice
  50         prompt "Kernel compression mode"
  51         default KERNEL_GZIP
  52 @@ -193,9 +196,10 @@ config KERNEL_LZO
  53         bool "LZO"
  54         depends on HAVE_KERNEL_LZO
  55         help
  56 -         Its compression ratio is the poorest among the choices. The kernel
  57 -         size is about 10% bigger than gzip; however its speed
  58 -         (both compression and decompression) is the fastest.
  59 +         Its compression ratio is the poorest among the choices (apart from
  60 +         uncompressed below). The kernel size is about 10% bigger than gzip;
  61 +         however its speed (both compression and decompression) is the
  62 +         fastest.
  63
  64  config KERNEL_LZ4
  65         bool "LZ4"
  66 @@ -209,6 +213,12 @@ config KERNEL_LZ4
  67           is about 8% bigger than LZO. But the decompression speed is
  68           faster than LZO.
  69
  70 +config KERNEL_CAT
  71 +       bool "uncompressed"
  72 +       depends on HAVE_KERNEL_CAT
  73 +       help
  74 +         Don't use compression at all.
  75 +
  76  endchoice
  77
  78  config DEFAULT_HOSTNAME
  79 --- /dev/null
  80 +++ b/lib/decompress_uncat.c
  81 @@ -0,0 +1,17 @@
  82 +#include <linux/types.h>
  83 +#include <linux/compiler.h>
  84 +
  85 +#ifdef STATIC
  86 +
  87 +STATIC int __decompress(unsigned char *buf, long in_len,
  88 +                       long (*fill)(void*, unsigned long),
  89 +                       long (*flush)(void*, unsigned long),
  90 +                       unsigned char *output, long out_len,
  91 +                       long *posp,
  92 +                       void (*error)(char *x))
  93 +{
  94 +       memmove(output, buf, in_len);
  95 +       return 0;
  96 +}
  97 +
  98 +#endif
  99 --- a/scripts/Makefile.lib
 100 +++ b/scripts/Makefile.lib
 101 @@ -357,6 +357,13 @@ cmd_lz4 = (cat $(filter-out FORCE,$^) |
 102         lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 103         (rm -f $@ ; false)
 104
 105 +# uncompressed
 106 +# ---------------------------------------------------------------------------
 107 +quiet_cmd_cat = CAT     $@
 108 +cmd_cat = (cat $(filter-out FORCE,$^) \
 109 +       && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 110 +       (rm -f $@ ; false)
 111 +
 112  # U-Boot mkimage
 113  # ---------------------------------------------------------------------------
 114
 115 --- a/arch/arm/Kconfig
 116 +++ b/arch/arm/Kconfig
 117 @@ -65,6 +65,7 @@ config ARM
 118         select HAVE_KERNEL_LZMA
 119         select HAVE_KERNEL_LZO
 120         select HAVE_KERNEL_XZ
 121 +       select HAVE_KERNEL_CAT
 122         select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
 123         select HAVE_KRETPROBES if (HAVE_KPROBES)
 124         select HAVE_MEMBLOCK