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@@ -522,3 +522,21 @@ MKIMAGEOUTPUT ?= /dev/null
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quiet_cmd_mkimage = MKIMAGE $@
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cmd_mkimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -d $< $@ \
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$(if $(KBUILD_VERBOSE:1=), >$(MKIMAGEOUTPUT))
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+
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+# fdtgrep
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+# ---------------------------------------------------------------------------
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+# Pass the original device tree file through fdtgrep twice. The first pass
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+# removes any unwanted nodes (i.e. those which don't have the
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+# 'u-boot,dm-pre-reloc' property and thus are not needed by SPL. The second
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+# pass removes various unused properties from the remaining nodes.
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+# The output is typically a much smaller device tree file.
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+ifeq ($(CONFIG_TPL_BUILD),y)
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+fdtgrep_props := -b u-boot,dm-pre-reloc -b u-boot,dm-tpl
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+else
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+fdtgrep_props := -b u-boot,dm-pre-reloc -b u-boot,dm-spl
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+endif
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+quiet_cmd_fdtgrep = FDTGREP $@
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+ cmd_fdtgrep = $(objtree)/tools/fdtgrep $(fdtgrep_props) -RT $< \
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+ -n /chosen -n /config -O dtb | \
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+ $(objtree)/tools/fdtgrep -r -O dtb - -o $@ \
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+ $(addprefix -P ,$(subst $\",,$(CONFIG_OF_SPL_REMOVE_PROPS)))
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