cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -f -9 > $@) || \
(rm -f $@ ; false)
+# DTC
+# ---------------------------------------------------------------------------
+
+# Generate an assembly file to wrap the output of the device tree compiler
+quiet_cmd_dt_S_dtb= DTB $@
+cmd_dt_S_dtb= \
+( \
+ echo '\#include <asm-generic/vmlinux.lds.h>'; \
+ echo '.section .dtb.init.rodata,"a"'; \
+ echo '.balign STRUCT_ALIGNMENT'; \
+ echo '.global __dtb_$(*F)_begin'; \
+ echo '__dtb_$(*F)_begin:'; \
+ echo '.incbin "$<" '; \
+ echo '__dtb_$(*F)_end:'; \
+ echo '.global __dtb_$(*F)_end'; \
+ echo '.balign STRUCT_ALIGNMENT'; \
+) > $@
+
+$(obj)/%.dtb.S: $(obj)/%.dtb
+ $(call cmd,dt_S_dtb)
+
+quiet_cmd_dtc = DTC $@
+cmd_dtc = $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) $<
# Bzip2
# ---------------------------------------------------------------------------
lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
(rm -f $@ ; false)
+# XZ
+# ---------------------------------------------------------------------------
+# Use xzkern to compress the kernel image and xzmisc to compress other things.
+#
+# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
+# of the kernel decompressor. A BCJ filter is used if it is available for
+# the target architecture. xzkern also appends uncompressed size of the data
+# using size_append. The .xz format has the size information available at
+# the end of the file too, but it's in more complex format and it's good to
+# avoid changing the part of the boot code that reads the uncompressed size.
+# Note that the bytes added by size_append will make the xz tool think that
+# the file is corrupt. This is expected.
+#
+# xzmisc doesn't use size_append, so it can be used to create normal .xz
+# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
+# big dictionary would increase the memory usage too much in the multi-call
+# decompression mode. A BCJ filter isn't used either.
+quiet_cmd_xzkern = XZKERN $@
+cmd_xzkern = (cat $(filter-out FORCE,$^) | \
+ sh $(srctree)/scripts/xz_wrap.sh && \
+ $(call size_append, $(filter-out FORCE,$^))) > $@ || \
+ (rm -f $@ ; false)
+
+quiet_cmd_xzmisc = XZMISC $@
+cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
+ xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
+ (rm -f $@ ; false)
+
# misc stuff
# ---------------------------------------------------------------------------
quote:="