kernel: add support for uncompressed zImage on ARM
This can be used to prevent double compression for platforms where the boot loader already expects compressed images. Signed-off-by: Felix Fietkau <nbd@nbd.name>
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Felix Fietkau
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af1791964d
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e6d3899ddc
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@ -1242,6 +1242,7 @@ CONFIG_GENERIC_NET_UTILS=y
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# CONFIG_HAVE_AOUT is not set
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# CONFIG_HAVE_ARM_ARCH_TIMER is not set
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CONFIG_HAVE_KERNEL_BZIP2=y
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CONFIG_HAVE_KERNEL_CAT=y
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CONFIG_HAVE_KERNEL_GZIP=y
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CONFIG_HAVE_KERNEL_LZ4=y
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CONFIG_HAVE_KERNEL_LZMA=y
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@ -1801,6 +1802,7 @@ CONFIG_JOLIET=y
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# CONFIG_KALLSYMS_UNCOMPRESSED is not set
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# CONFIG_KARMA_PARTITION is not set
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# CONFIG_KERNEL_BZIP2 is not set
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# CONFIG_KERNEL_CAT is not set
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# CONFIG_KERNEL_GZIP is not set
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# CONFIG_KERNEL_LZ4 is not set
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# CONFIG_KERNEL_LZMA is not set
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133
target/linux/generic/patches-4.4/222-arm_zimage_none.patch
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133
target/linux/generic/patches-4.4/222-arm_zimage_none.patch
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@ -0,0 +1,133 @@
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ARM: implement "uncompressed zImage"
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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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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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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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# Borrowed libfdt files for the ATAG compatibility mode
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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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# 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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--- 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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+#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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+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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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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+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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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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+# 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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--- 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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@ -20,7 +20,7 @@
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+#endif
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--- a/init/Kconfig
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+++ b/init/Kconfig
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@@ -1286,6 +1286,10 @@ config RELAY
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@@ -1296,6 +1296,10 @@ config RELAY
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If unsure, say N.
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@ -40,7 +40,7 @@
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setup_per_cpu_areas();
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--- a/init/Kconfig
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+++ b/init/Kconfig
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@@ -1638,6 +1638,15 @@ config EMBEDDED
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@@ -1648,6 +1648,15 @@ config EMBEDDED
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an embedded system so certain expert options are available
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for configuration.
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