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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 @@ compress-$(CONFIG_KERNEL_LZO) = lzo
compress-$(CONFIG_KERNEL_LZMA) = lzma
compress-$(CONFIG_KERNEL_XZ) = xzkern
compress-$(CONFIG_KERNEL_LZ4) = lz4
+compress-$(CONFIG_KERNEL_CAT) = cat
# Borrowed libfdt files for the ATAG compatibility mode
--- 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
@@ -127,6 +127,9 @@ config HAVE_KERNEL_LZO
config HAVE_KERNEL_LZ4
bool
+config HAVE_KERNEL_CAT
+ bool
+
choice
prompt "Kernel compression mode"
default KERNEL_GZIP
@@ -193,9 +196,10 @@ 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"
@@ -209,6 +213,12 @@ 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
@@ -357,6 +357,13 @@ 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
@@ -65,6 +65,7 @@ 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
|
