diff --git a/core/dex_preopt.mk b/core/dex_preopt.mk
index 62c3ba3..af5ff9d 100644
--- a/core/dex_preopt.mk
+++ b/core/dex_preopt.mk
@@ -80,15 +80,40 @@
   $(foreach m,$(other_system_server_jars),\
     $(PRODUCT_OUT)/$(call word-colon,1,$(m))/framework/$(call word-colon,2,$(m)).jar)
 
+# Infix can be 'art' (ART image for testing), 'boot' (primary), or 'mainline' (mainline extension).
+# Soong creates a set of variables for Make, one or each boot image. The only reason why the ART
+# image is exposed to Make is testing (art gtests) and benchmarking (art golem benchmarks). Install
+# rules that use those variables are in dex_preopt_libart.mk. Here for dexpreopt purposes the infix
+# is always 'boot' or 'mainline'.
+DEXPREOPT_INFIX := $(if $(filter true,$(DEX_PREOPT_WITH_UPDATABLE_BCP)),mainline,boot)
+
+# The input variables are written by build/soong/java/dexpreopt_bootjars.go. Examples can be found
+# at the bottom of build/soong/java/dexpreopt_config_testing.go.
+dexpreopt_root_dir := $(dir $(patsubst %/,%,$(dir $(firstword $(bootclasspath_jars)))))
+booclasspath_arg := $(subst $(space),:,$(patsubst $(dexpreopt_root_dir)%,%,$(DEXPREOPT_BOOTCLASSPATH_DEX_FILES)))
+booclasspath_locations_arg := $(subst $(space),:,$(DEXPREOPT_BOOTCLASSPATH_DEX_LOCATIONS))
+boot_images := $(subst :,$(space),$(DEXPREOPT_IMAGE_LOCATIONS_ON_DEVICE$(DEXPREOPT_INFIX)))
+boot_image_arg := $(subst $(space),:,$(patsubst /%,%,$(boot_images)))
+
+boot_zip_metadata_txt := $(boot_zip).METADATA.txt
+$(boot_zip_metadata_txt):
+	rm -f $@
+	echo "booclasspath = $(booclasspath_arg)" >> $@
+	echo "booclasspath-locations = $(booclasspath_locations_arg)" >> $@
+	echo "boot-image = $(boot_image_arg)" >> $@
+
+$(call dist-for-goals, droidcore, $(boot_zip_metadata_txt))
+
 $(boot_zip): PRIVATE_BOOTCLASSPATH_JARS := $(bootclasspath_jars)
 $(boot_zip): PRIVATE_SYSTEM_SERVER_JARS := $(system_server_jars)
-$(boot_zip): $(bootclasspath_jars) $(system_server_jars) $(SOONG_ZIP) $(MERGE_ZIPS) $(DEXPREOPT_IMAGE_ZIP_boot) $(DEXPREOPT_IMAGE_ZIP_art)
+$(boot_zip): $(bootclasspath_jars) $(system_server_jars) $(SOONG_ZIP) $(MERGE_ZIPS) $(DEXPREOPT_IMAGE_ZIP_boot) $(DEXPREOPT_IMAGE_ZIP_art) $(DEXPREOPT_IMAGE_ZIP_mainline) $(boot_zip_metadata_txt)
 	@echo "Create boot package: $@"
 	rm -f $@
 	$(SOONG_ZIP) -o $@.tmp \
 	  -C $(dir $(firstword $(PRIVATE_BOOTCLASSPATH_JARS)))/.. $(addprefix -f ,$(PRIVATE_BOOTCLASSPATH_JARS)) \
-	  -C $(PRODUCT_OUT) $(addprefix -f ,$(PRIVATE_SYSTEM_SERVER_JARS))
-	$(MERGE_ZIPS) $@ $@.tmp $(DEXPREOPT_IMAGE_ZIP_boot) $(DEXPREOPT_IMAGE_ZIP_art)
+	  -C $(PRODUCT_OUT) $(addprefix -f ,$(PRIVATE_SYSTEM_SERVER_JARS)) \
+	  -e METADATA.txt -f $(boot_zip_metadata_txt)
+	$(MERGE_ZIPS) $@ $@.tmp $(DEXPREOPT_IMAGE_ZIP_boot) $(DEXPREOPT_IMAGE_ZIP_art) $(DEXPREOPT_IMAGE_ZIP_mainline)
 	rm -f $@.tmp
 
 $(call dist-for-goals, droidcore, $(boot_zip))
diff --git a/core/dex_preopt_odex_install.mk b/core/dex_preopt_odex_install.mk
index 14fafa1..bdd47a8 100644
--- a/core/dex_preopt_odex_install.mk
+++ b/core/dex_preopt_odex_install.mk
@@ -274,13 +274,7 @@
 my_dexpreopt_images_deps :=
 my_dexpreopt_image_locations_on_host :=
 my_dexpreopt_image_locations_on_device :=
-# Infix can be 'art', 'boot', or 'mainline'. Soong creates a set of variables
-# for Make, one or each boot image (primary, the framework extension, and the
-# mainline extension). The only reason why the primary image is exposed to Make
-# is testing (art gtests) and benchmarking (art golem benchmarks). Install rules
-# that use those variables are in dex_preopt_libart.mk. Here for dexpreopt
-# purposes the infix is always 'boot' or 'mainline'.
-my_dexpreopt_infix := $(if $(filter true,$(DEX_PREOPT_WITH_UPDATABLE_BCP)),mainline,boot)
+my_dexpreopt_infix := $(DEXPREOPT_INFIX)
 my_create_dexpreopt_config :=
 
 ifdef LOCAL_DEX_PREOPT