1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
ARM: implement "uncompressed zImage"
Based on RFC patch by Uwe Kleine-König
http://www.spinics.net/lists/arm-kernel/msg230153.html
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -71,6 +71,7 @@ suffix_$(CONFIG_KERNEL_LZO) = lzo
suffix_$(CONFIG_KERNEL_LZMA) = lzma
suffix_$(CONFIG_KERNEL_XZ) = xzkern
suffix_$(CONFIG_KERNEL_LZ4) = lz4
+suffix_$(CONFIG_KERNEL_CAT) = cat
# Borrowed libfdt files for the ATAG compatibility mode
@@ -95,7 +96,7 @@ targets := vmlinux vmlinux.lds \
bswapsdi2.S font.o font.c head.o misc.o $(OBJS)
# Make sure files are removed during clean
-extra-y += piggy.gzip piggy.lzo piggy.lzma piggy.xzkern piggy.lz4 \
+extra-y += piggy.gzip piggy.lzo piggy.lzma piggy.xzkern piggy.lz4 piggy.cat \
lib1funcs.S ashldi3.S bswapsdi2.S $(libfdt) $(libfdt_hdrs) \
hyp-stub.S
--- a/arch/arm/boot/compressed/decompress.c
+++ b/arch/arm/boot/compressed/decompress.c
@@ -55,6 +55,10 @@ extern char * strstr(const char * s1, co
#include "../../../../lib/decompress_unlz4.c"
#endif
+#ifdef CONFIG_KERNEL_CAT
+#include "../../../../lib/decompress_uncat.c"
+#endif
+
int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
{
return __decompress(input, len, NULL, NULL, output, 0, NULL, error);
--- /dev/null
+++ b/arch/arm/boot/compressed/piggy.cat.S
@@ -0,0 +1,6 @@
+ .section .piggydata,#alloc
+ .globl input_data
+input_data:
+ .incbin "arch/arm/boot/compressed/piggy.cat"
+ .globl input_data_end
+input_data_end:
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -115,6 +115,9 @@ config HAVE_KERNEL_LZO
config HAVE_KERNEL_LZ4
bool
+config HAVE_KERNEL_CAT
+ bool
+
choice
prompt "Kernel compression mode"
default KERNEL_GZIP
@@ -181,9 +184,10 @@ config KERNEL_LZO
bool "LZO"
depends on HAVE_KERNEL_LZO
help
- Its compression ratio is the poorest among the choices. The kernel
- size is about 10% bigger than gzip; however its speed
- (both compression and decompression) is the fastest.
+ Its compression ratio is the poorest among the choices (apart from
+ uncompressed below). The kernel size is about 10% bigger than gzip;
+ however its speed (both compression and decompression) is the
+ fastest.
config KERNEL_LZ4
bool "LZ4"
@@ -197,6 +201,12 @@ config KERNEL_LZ4
is about 8% bigger than LZO. But the decompression speed is
faster than LZO.
+config KERNEL_CAT
+ bool "uncompressed"
+ depends on HAVE_KERNEL_CAT
+ help
+ Don't use compression at all.
+
endchoice
config DEFAULT_HOSTNAME
--- /dev/null
+++ b/lib/decompress_uncat.c
@@ -0,0 +1,17 @@
+#include <linux/types.h>
+#include <linux/compiler.h>
+
+#ifdef STATIC
+
+STATIC int __decompress(unsigned char *buf, long in_len,
+ long (*fill)(void*, unsigned long),
+ long (*flush)(void*, unsigned long),
+ unsigned char *output, long out_len,
+ long *posp,
+ void (*error)(char *x))
+{
+ memmove(output, buf, in_len);
+ return 0;
+}
+
+#endif
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -337,6 +337,13 @@ cmd_lz4 = (cat $(filter-out FORCE,$^) |
lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
(rm -f $@ ; false)
+# uncompressed
+# ---------------------------------------------------------------------------
+quiet_cmd_cat = CAT $@
+cmd_cat = (cat $(filter-out FORCE,$^) \
+ && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
+ (rm -f $@ ; false)
+
# U-Boot mkimage
# ---------------------------------------------------------------------------
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -59,6 +59,7 @@ config ARM
select HAVE_KERNEL_LZMA
select HAVE_KERNEL_LZO
select HAVE_KERNEL_XZ
+ select HAVE_KERNEL_CAT
select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
select HAVE_KRETPROBES if (HAVE_KPROBES)
select HAVE_MEMBLOCK
|
