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@@ -0,0 +1,133 @@
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+ARM: implement "uncompressed zImage"
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+
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+Based on RFC patch by Uwe Kleine-König
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+http://www.spinics.net/lists/arm-kernel/msg230153.html
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+
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+Signed-off-by: Felix Fietkau <[email protected]>
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+---
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+--- a/arch/arm/boot/compressed/Makefile
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++++ b/arch/arm/boot/compressed/Makefile
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+@@ -71,6 +71,7 @@ suffix_$(CONFIG_KERNEL_LZO) = lzo
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+ suffix_$(CONFIG_KERNEL_LZMA) = lzma
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+ suffix_$(CONFIG_KERNEL_XZ) = xzkern
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+ suffix_$(CONFIG_KERNEL_LZ4) = lz4
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++suffix_$(CONFIG_KERNEL_CAT) = cat
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+
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+ # Borrowed libfdt files for the ATAG compatibility mode
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+
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+@@ -95,7 +96,7 @@ targets := vmlinux vmlinux.lds \
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+ bswapsdi2.S font.o font.c head.o misc.o $(OBJS)
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+
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+ # Make sure files are removed during clean
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+-extra-y += piggy.gzip piggy.lzo piggy.lzma piggy.xzkern piggy.lz4 \
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++extra-y += piggy.gzip piggy.lzo piggy.lzma piggy.xzkern piggy.lz4 piggy.cat \
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+ lib1funcs.S ashldi3.S bswapsdi2.S $(libfdt) $(libfdt_hdrs) \
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+ hyp-stub.S
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+
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+--- a/arch/arm/boot/compressed/decompress.c
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++++ b/arch/arm/boot/compressed/decompress.c
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+@@ -55,6 +55,10 @@ extern char * strstr(const char * s1, co
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+ #include "../../../../lib/decompress_unlz4.c"
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+ #endif
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+
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++#ifdef CONFIG_KERNEL_CAT
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++#include "../../../../lib/decompress_uncat.c"
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++#endif
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++
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+ int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
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+ {
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+ return __decompress(input, len, NULL, NULL, output, 0, NULL, error);
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+--- /dev/null
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++++ b/arch/arm/boot/compressed/piggy.cat.S
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+@@ -0,0 +1,6 @@
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++ .section .piggydata,#alloc
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++ .globl input_data
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++input_data:
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++ .incbin "arch/arm/boot/compressed/piggy.cat"
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++ .globl input_data_end
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++input_data_end:
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+--- a/init/Kconfig
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++++ b/init/Kconfig
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+@@ -115,6 +115,9 @@ config HAVE_KERNEL_LZO
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+ config HAVE_KERNEL_LZ4
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+ bool
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+
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++config HAVE_KERNEL_CAT
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++ bool
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++
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+ choice
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+ prompt "Kernel compression mode"
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+ default KERNEL_GZIP
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+@@ -181,9 +184,10 @@ config KERNEL_LZO
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+ bool "LZO"
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+ depends on HAVE_KERNEL_LZO
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+ help
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+- Its compression ratio is the poorest among the choices. The kernel
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+- size is about 10% bigger than gzip; however its speed
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+- (both compression and decompression) is the fastest.
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++ Its compression ratio is the poorest among the choices (apart from
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++ uncompressed below). The kernel size is about 10% bigger than gzip;
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++ however its speed (both compression and decompression) is the
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++ fastest.
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+
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+ config KERNEL_LZ4
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+ bool "LZ4"
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+@@ -197,6 +201,12 @@ config KERNEL_LZ4
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+ is about 8% bigger than LZO. But the decompression speed is
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+ faster than LZO.
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+
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++config KERNEL_CAT
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++ bool "uncompressed"
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++ depends on HAVE_KERNEL_CAT
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++ help
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++ Don't use compression at all.
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++
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+ endchoice
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+
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+ config DEFAULT_HOSTNAME
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+--- /dev/null
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++++ b/lib/decompress_uncat.c
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+@@ -0,0 +1,17 @@
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++#include <linux/types.h>
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++#include <linux/compiler.h>
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++
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++#ifdef STATIC
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++
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++STATIC int __decompress(unsigned char *buf, long in_len,
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++ long (*fill)(void*, unsigned long),
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++ long (*flush)(void*, unsigned long),
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++ unsigned char *output, long out_len,
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++ long *posp,
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++ void (*error)(char *x))
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++{
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++ memmove(output, buf, in_len);
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++ return 0;
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++}
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++
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++#endif
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+--- a/scripts/Makefile.lib
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++++ b/scripts/Makefile.lib
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+@@ -337,6 +337,13 @@ cmd_lz4 = (cat $(filter-out FORCE,$^) |
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+ lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
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+ (rm -f $@ ; false)
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+
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++# uncompressed
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++# ---------------------------------------------------------------------------
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++quiet_cmd_cat = CAT $@
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++cmd_cat = (cat $(filter-out FORCE,$^) \
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++ && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
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++ (rm -f $@ ; false)
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++
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+ # U-Boot mkimage
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+ # ---------------------------------------------------------------------------
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+
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+--- a/arch/arm/Kconfig
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++++ b/arch/arm/Kconfig
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+@@ -59,6 +59,7 @@ config ARM
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+ select HAVE_KERNEL_LZMA
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+ select HAVE_KERNEL_LZO
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+ select HAVE_KERNEL_XZ
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++ select HAVE_KERNEL_CAT
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+ select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
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+ select HAVE_KRETPROBES if (HAVE_KPROBES)
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+ select HAVE_MEMBLOCK
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Felix Fietkau