diff --git a/core/Makefile b/core/Makefile
index b36bf1f..d1bec74 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -204,6 +204,11 @@
 # Depmod requires a well-formed kernel version so 0.0 is used as a placeholder.
 DEPMOD_STAGING_SUBDIR :=$= lib/modules/0.0
 
+define copy-and-strip-kernel-module
+$(2): $(1)
+	$($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_STRIP) -o $(2) --strip-debug $(1)
+endef
+
 # $(1): modules list
 # $(2): output dir
 # $(3): mount point
@@ -211,9 +216,15 @@
 # $(5): module load list
 # $(6): module load list filename
 # $(7): module archive
+# $(8): staging dir for stripped modules
 # Returns the a list of src:dest pairs to install the modules using copy-many-files.
 define build-image-kernel-modules
-  $(foreach module,$(1),$(module):$(2)/lib/modules/$(notdir $(module))) \
+  $(foreach module,$(1), \
+    $(eval _src := $(module)) \
+    $(if $(8), \
+      $(eval _src := $(8)/$(notdir $(module))) \
+      $(eval $(call copy-and-strip-kernel-module,$(module),$(_src)))) \
+    $(_src):$(2)/lib/modules/$(notdir $(module))) \
   $(eval $(call build-image-kernel-modules-depmod,$(1),$(3),$(4),$(5),$(6),$(7),$(2))) \
   $(4)/$(DEPMOD_STAGING_SUBDIR)/modules.dep:$(2)/lib/modules/modules.dep \
   $(4)/$(DEPMOD_STAGING_SUBDIR)/modules.alias:$(2)/lib/modules/modules.alias \
@@ -313,14 +324,14 @@
       ALL_DEFAULT_INSTALLED_MODULES += $(call copy-many-files,$(call module-load-list-copy-paths,$(call intermediates-dir-for,PACKAGING,ramdisk_modules),$(BOARD_GENERIC_RAMDISK_KERNEL_MODULES),$(BOARD_GENERIC_RAMDISK_KERNEL_MODULES_LOAD),modules.load,$(TARGET_RECOVERY_ROOT_OUT)))
     endif
   endif
-  ALL_DEFAULT_INSTALLED_MODULES += $(call copy-many-files,$(call build-image-kernel-modules,$(BOARD_RECOVERY_KERNEL_MODULES),$(TARGET_RECOVERY_ROOT_OUT),,$(call intermediates-dir-for,PACKAGING,depmod_recovery),$(BOARD_RECOVERY_KERNEL_MODULES_LOAD),modules.load.recovery,$(BOARD_RECOVERY_KERNEL_MODULES_ARCHIVE)))
+  ALL_DEFAULT_INSTALLED_MODULES += $(call copy-many-files,$(call build-image-kernel-modules,$(BOARD_RECOVERY_KERNEL_MODULES),$(TARGET_RECOVERY_ROOT_OUT),,$(call intermediates-dir-for,PACKAGING,depmod_recovery),$(BOARD_RECOVERY_KERNEL_MODULES_LOAD),modules.load.recovery,$(BOARD_RECOVERY_KERNEL_MODULES_ARCHIVE),))
 endif
 
 ifneq ($(strip $(BOARD_VENDOR_RAMDISK_KERNEL_MODULES))$(strip $(BOARD_VENDOR_RAMDISK_KERNEL_MODULES_ARCHIVE)),)
   ifeq ($(BOARD_VENDOR_RAMDISK_KERNEL_MODULES_LOAD),)
     BOARD_VENDOR_RAMDISK_KERNEL_MODULES_LOAD := $(BOARD_VENDOR_RAMDISK_KERNEL_MODULES)
   endif
-  ALL_DEFAULT_INSTALLED_MODULES += $(call copy-many-files,$(call build-image-kernel-modules,$(BOARD_VENDOR_RAMDISK_KERNEL_MODULES),$(TARGET_VENDOR_RAMDISK_OUT),,$(call intermediates-dir-for,PACKAGING,depmod_vendor_ramdisk),$(BOARD_VENDOR_RAMDISK_KERNEL_MODULES_LOAD),modules.load,$(BOARD_VENDOR_RAMDISK_KERNEL_MODULES_ARCHIVE)))
+  ALL_DEFAULT_INSTALLED_MODULES += $(call copy-many-files,$(call build-image-kernel-modules,$(BOARD_VENDOR_RAMDISK_KERNEL_MODULES),$(TARGET_VENDOR_RAMDISK_OUT),,$(call intermediates-dir-for,PACKAGING,depmod_vendor_ramdisk),$(BOARD_VENDOR_RAMDISK_KERNEL_MODULES_LOAD),modules.load,$(BOARD_VENDOR_RAMDISK_KERNEL_MODULES_ARCHIVE),$(call intermediates-dir-for,PACKAGING,depmod_vendor_ramdisk_stripped)))
   ifneq (,$(BOARD_VENDOR_RAMDISK_RECOVERY_KERNEL_MODULES_LOAD))
     # BOARD_VENDOR_RAMDISK_KERNEL_MODULES must be the full set, or super set,
     # of copied modules represented by BOARD_VENDOR_RAMDISK_KERNEL_MODULES_LOAD
@@ -332,22 +343,27 @@
 
 ifneq ($(BOARD_USES_RECOVERY_AS_BOOT), true)
   ifneq ($(strip $(BOARD_GENERIC_RAMDISK_KERNEL_MODULES)),)
-    ALL_DEFAULT_INSTALLED_MODULES += $(call copy-many-files,$(call build-image-kernel-modules,$(BOARD_GENERIC_RAMDISK_KERNEL_MODULES),$(TARGET_RAMDISK_OUT),,$(call intermediates-dir-for,PACKAGING,depmod_ramdisk),$(BOARD_GENERIC_RAMDISK_KERNEL_MODULES_LOAD),modules.load,))
+    ALL_DEFAULT_INSTALLED_MODULES += $(call copy-many-files,$(call build-image-kernel-modules,$(BOARD_GENERIC_RAMDISK_KERNEL_MODULES),$(TARGET_RAMDISK_OUT),,$(call intermediates-dir-for,PACKAGING,depmod_ramdisk),$(BOARD_GENERIC_RAMDISK_KERNEL_MODULES_LOAD),modules.load,,))
   endif
 endif
 
+ifneq ($(BOARD_DO_NOT_STRIP_VENDOR_MODULES),true)
+	VENDOR_STRIPPED_MODULE_STAGING_DIR := $(call intermediates-dir-for,PACKAGING,depmod_vendor_stripped)
+else
+	VENDOR_STRIPPED_MODULE_STAGING_DIR :=
+endif
 ifneq ($(strip $(BOARD_VENDOR_KERNEL_MODULES)$(strip $(BOARD_VENDOR_KERNEL_MODULES_ARCHIVE))),)
   ifeq ($(BOARD_VENDOR_KERNEL_MODULES_LOAD),)
     BOARD_VENDOR_KERNEL_MODULES_LOAD := $(BOARD_VENDOR_KERNEL_MODULES)
   endif
-  ALL_DEFAULT_INSTALLED_MODULES += $(call copy-many-files,$(call build-image-kernel-modules,$(BOARD_VENDOR_KERNEL_MODULES),$(TARGET_OUT_VENDOR),vendor,$(call intermediates-dir-for,PACKAGING,depmod_vendor),$(BOARD_VENDOR_KERNEL_MODULES_LOAD),modules.load,$(BOARD_VENDOR_KERNEL_MODULES_ARCHIVE)))
+  ALL_DEFAULT_INSTALLED_MODULES += $(call copy-many-files,$(call build-image-kernel-modules,$(BOARD_VENDOR_KERNEL_MODULES),$(TARGET_OUT_VENDOR),vendor,$(call intermediates-dir-for,PACKAGING,depmod_vendor),$(BOARD_VENDOR_KERNEL_MODULES_LOAD),modules.load,$(BOARD_VENDOR_KERNEL_MODULES_ARCHIVE),$(VENDOR_STRIPPED_MODULE_STAGING_DIR)))
 endif
 
 ifneq ($(strip $(BOARD_ODM_KERNEL_MODULES))$(strip $(BOARD_ODM_KERNEL_MODULES_ARCHIVE)),)
   ifeq ($(BOARD_RECOVERY_KERNEL_MODULES_LOAD),)
     BOARD_ODM_KERNEL_MODULES_LOAD := $(BOARD_ODM_KERNEL_MODULES)
   endif
-  ALL_DEFAULT_INSTALLED_MODULES += $(call copy-many-files,$(call build-image-kernel-modules,$(BOARD_ODM_KERNEL_MODULES),$(TARGET_OUT_ODM),odm,$(call intermediates-dir-for,PACKAGING,depmod_odm),$(BOARD_ODM_KERNEL_MODULES_LOAD),modules.load,$(BOARD_ODM_KERNEL_MODULES_ARCHIVE)))
+  ALL_DEFAULT_INSTALLED_MODULES += $(call copy-many-files,$(call build-image-kernel-modules,$(BOARD_ODM_KERNEL_MODULES),$(TARGET_OUT_ODM),odm,$(call intermediates-dir-for,PACKAGING,depmod_odm),$(BOARD_ODM_KERNEL_MODULES_LOAD),modules.load,$(BOARD_ODM_KERNEL_MODULES_ARCHIVE),))
 endif
 
 # -----------------------------------------------------------------
@@ -590,16 +606,27 @@
 $(call dist-for-goals, sdk win_sdk sdk_addon, $(INSTALLED_FILES_FILE_RAMDISK))
 BUILT_RAMDISK_TARGET := $(PRODUCT_OUT)/ramdisk.img
 
+ifeq ($(BOARD_RAMDISK_USE_LZ4),true)
+# -l enables the legacy format used by the Linux kernel
+COMPRESSION_COMMAND_DEPS := $(LZ4)
+COMPRESSION_COMMAND := $(LZ4) -l -12 --favor-decSpeed
+RAMDISK_EXT := .lz4
+else
+COMPRESSION_COMMAND_DEPS := $(MINIGZIP)
+COMPRESSION_COMMAND := $(MINIGZIP)
+RAMDISK_EXT := .gz
+endif
+
 # We just build this directly to the install location.
 INSTALLED_RAMDISK_TARGET := $(BUILT_RAMDISK_TARGET)
-$(INSTALLED_RAMDISK_TARGET): $(MKBOOTFS) $(INTERNAL_RAMDISK_FILES) $(INSTALLED_FILES_FILE_RAMDISK) | $(MINIGZIP)
+$(INSTALLED_RAMDISK_TARGET): $(MKBOOTFS) $(INTERNAL_RAMDISK_FILES) $(INSTALLED_FILES_FILE_RAMDISK) | $(COMPRESSION_COMMAND_DEPS)
 	$(call pretty,"Target ram disk: $@")
-	$(hide) $(MKBOOTFS) -d $(TARGET_OUT) $(TARGET_RAMDISK_OUT) | $(MINIGZIP) > $@
+	$(hide) $(MKBOOTFS) -d $(TARGET_OUT) $(TARGET_RAMDISK_OUT) | $(COMPRESSION_COMMAND) > $@
 
 .PHONY: ramdisk-nodeps
-ramdisk-nodeps: $(MKBOOTFS) | $(MINIGZIP)
+ramdisk-nodeps: $(MKBOOTFS) | $(COMPRESSION_COMMAND_DEPS)
 	@echo "make $@: ignoring dependencies"
-	$(hide) $(MKBOOTFS) -d $(TARGET_OUT) $(TARGET_RAMDISK_OUT) | $(MINIGZIP) > $(INSTALLED_RAMDISK_TARGET)
+	$(hide) $(MKBOOTFS) -d $(TARGET_OUT) $(TARGET_RAMDISK_OUT) | $(COMPRESSION_COMMAND) > $(INSTALLED_RAMDISK_TARGET)
 
 endif # BUILDING_RAMDISK_IMAGE
 
@@ -773,8 +800,8 @@
     $(ALL_DEFAULT_INSTALLED_MODULES))
 
 INTERNAL_VENDOR_RAMDISK_TARGET := $(call intermediates-dir-for,PACKAGING,vendor-boot)/vendor-ramdisk.cpio.gz
-$(INTERNAL_VENDOR_RAMDISK_TARGET): $(MKBOOTFS) $(INTERNAL_VENDOR_RAMDISK_FILES) | $(MINIGZIP)
-	$(MKBOOTFS) -d $(TARGET_OUT) $(TARGET_VENDOR_RAMDISK_OUT) | $(MINIGZIP) > $@
+$(INTERNAL_VENDOR_RAMDISK_TARGET): $(MKBOOTFS) $(INTERNAL_VENDOR_RAMDISK_FILES) | $(COMPRESSION_COMMAND_DEPS)
+	$(MKBOOTFS) -d $(TARGET_OUT) $(TARGET_VENDOR_RAMDISK_OUT) | $(COMPRESSION_COMMAND) > $@
 
 ifdef BOARD_INCLUDE_DTB_IN_BOOTIMG
   INTERNAL_VENDOR_BOOTIMAGE_ARGS += --dtb $(INSTALLED_DTBIMAGE_TARGET)
@@ -1396,7 +1423,7 @@
 
 recovery_kernel := $(INSTALLED_KERNEL_TARGET) # same as a non-recovery system
 recovery_ramdisk := $(PRODUCT_OUT)/ramdisk-recovery.img
-recovery_resources_common := $(call include-path-for, recovery)/res
+recovery_resources_common := bootable/recovery/res
 
 # Set recovery_density to a density bucket based on TARGET_SCREEN_DENSITY, PRODUCT_AAPT_PREF_CONFIG,
 # or mdpi, in order of preference. We support both specific buckets (e.g. xdpi) and numbers,
@@ -1424,9 +1451,9 @@
 # Note that the font selected here can be overridden for a particular device by putting a font.png
 # in its private recovery resources.
 ifneq (,$(filter xxxhdpi xxhdpi xhdpi,$(recovery_density)))
-recovery_font := $(call include-path-for, recovery)/fonts/18x32.png
+recovery_font := bootable/recovery/fonts/18x32.png
 else
-recovery_font := $(call include-path-for, recovery)/fonts/12x22.png
+recovery_font := bootable/recovery/fonts/12x22.png
 endif
 
 
@@ -1450,7 +1477,7 @@
 endif
 
 
-RECOVERY_INSTALLING_TEXT_FILE := $(call intermediates-dir-for,PACKAGING,recovery_text_res)/installing_text.png
+RECOVERY_INSTALLING_TEXT_FILE := $(call intermediates-dir-for,ETC,recovery_text_res)/installing_text.png
 RECOVERY_INSTALLING_SECURITY_TEXT_FILE := $(dir $(RECOVERY_INSTALLING_TEXT_FILE))/installing_security_text.png
 RECOVERY_ERASING_TEXT_FILE := $(dir $(RECOVERY_INSTALLING_TEXT_FILE))/erasing_text.png
 RECOVERY_ERROR_TEXT_FILE := $(dir $(RECOVERY_INSTALLING_TEXT_FILE))/error_text.png
@@ -1474,11 +1501,12 @@
   $(RECOVERY_WIPE_DATA_CONFIRMATION_TEXT_FILE) \
   $(RECOVERY_WIPE_DATA_MENU_HEADER_TEXT_FILE)
 
-resource_dir := $(call include-path-for, recovery)/tools/recovery_l10n/res/
+resource_dir := bootable/recovery/tools/recovery_l10n/res/
+resource_dir_deps := $(sort $(shell find $(resource_dir) -name *.xml -not -name .*))
 image_generator_jar := $(HOST_OUT_JAVA_LIBRARIES)/RecoveryImageGenerator.jar
 zopflipng := $(HOST_OUT_EXECUTABLES)/zopflipng
 $(RECOVERY_INSTALLING_TEXT_FILE): PRIVATE_SOURCE_FONTS := $(recovery_noto-fonts_dep) $(recovery_roboto-fonts_dep)
-$(RECOVERY_INSTALLING_TEXT_FILE): PRIVATE_RECOVERY_FONT_FILES_DIR := $(call intermediates-dir-for,PACKAGING,recovery_font_files)
+$(RECOVERY_INSTALLING_TEXT_FILE): PRIVATE_RECOVERY_FONT_FILES_DIR := $(call intermediates-dir-for,ETC,recovery_font_files)
 $(RECOVERY_INSTALLING_TEXT_FILE): PRIVATE_RESOURCE_DIR := $(resource_dir)
 $(RECOVERY_INSTALLING_TEXT_FILE): PRIVATE_IMAGE_GENERATOR_JAR := $(image_generator_jar)
 $(RECOVERY_INSTALLING_TEXT_FILE): PRIVATE_ZOPFLIPNG := $(zopflipng)
@@ -1496,7 +1524,7 @@
   recovery_wipe_data_menu_header \
   recovery_wipe_data_confirmation
 $(RECOVERY_INSTALLING_TEXT_FILE): .KATI_IMPLICIT_OUTPUTS := $(filter-out $(RECOVERY_INSTALLING_TEXT_FILE),$(generated_recovery_text_files))
-$(RECOVERY_INSTALLING_TEXT_FILE): $(image_generator_jar) $(resource_dir) $(recovery_noto-fonts_dep) $(recovery_roboto-fonts_dep) $(zopflipng)
+$(RECOVERY_INSTALLING_TEXT_FILE): $(image_generator_jar) $(resource_dir_deps) $(recovery_noto-fonts_dep) $(recovery_roboto-fonts_dep) $(zopflipng)
 	# Prepares the font directory.
 	@rm -rf $(PRIVATE_RECOVERY_FONT_FILES_DIR)
 	@mkdir -p $(PRIVATE_RECOVERY_FONT_FILES_DIR)
@@ -1655,7 +1683,7 @@
   BOARD_RECOVERY_MKBOOTIMG_ARGS := $(BOARD_MKBOOTIMG_ARGS)
 endif
 
-$(recovery_ramdisk): $(MKBOOTFS) $(MINIGZIP) \
+$(recovery_ramdisk): $(MKBOOTFS) $(COMPRESSION_COMMAND_DEPS) \
 	    $(INTERNAL_ROOT_FILES) \
 	    $(INSTALLED_RAMDISK_TARGET) \
 	    $(INTERNAL_RECOVERYIMAGE_FILES) \
@@ -1690,7 +1718,7 @@
 	  cp -f $(recovery_wipe) $(TARGET_RECOVERY_ROOT_OUT)/system/etc/recovery.wipe)
 	ln -sf prop.default $(TARGET_RECOVERY_ROOT_OUT)/default.prop
 	$(BOARD_RECOVERY_IMAGE_PREPARE)
-	$(MKBOOTFS) -d $(TARGET_OUT) $(TARGET_RECOVERY_ROOT_OUT) | $(MINIGZIP) > $(recovery_ramdisk)
+	$(MKBOOTFS) -d $(TARGET_OUT) $(TARGET_RECOVERY_ROOT_OUT) | $(COMPRESSION_COMMAND) > $(recovery_ramdisk)
 
 # $(1): output file
 # $(2): kernel file
@@ -1848,22 +1876,22 @@
 # Depends on ramdisk.img, note that some target has ramdisk.img but no boot.img, e.g., emulator.
 $(INSTALLED_DEBUG_RAMDISK_TARGET): $(INSTALLED_RAMDISK_TARGET)
 endif # BOARD_USES_RECOVERY_AS_BOOT
-$(INSTALLED_DEBUG_RAMDISK_TARGET): $(MKBOOTFS) $(INTERNAL_DEBUG_RAMDISK_FILES) | $(MINIGZIP)
+$(INSTALLED_DEBUG_RAMDISK_TARGET): $(MKBOOTFS) $(INTERNAL_DEBUG_RAMDISK_FILES) | $(COMPRESSION_COMMAND_DEPS)
 	$(call pretty,"Target debug ram disk: $@")
 	mkdir -p $(TARGET_DEBUG_RAMDISK_OUT)
 	touch $(TARGET_DEBUG_RAMDISK_OUT)/force_debuggable
 	rsync -a $(DEBUG_RAMDISK_SYNC_DIR)/ $(DEBUG_RAMDISK_ROOT_DIR)
-	$(MKBOOTFS) -d $(TARGET_OUT) $(DEBUG_RAMDISK_ROOT_DIR) | $(MINIGZIP) > $@
+	$(MKBOOTFS) -d $(TARGET_OUT) $(DEBUG_RAMDISK_ROOT_DIR) | $(COMPRESSION_COMMAND) > $@
 
 .PHONY: ramdisk_debug-nodeps
 ramdisk_debug-nodeps: DEBUG_RAMDISK_SYNC_DIR := $(my_debug_ramdisk_sync_dir)
 ramdisk_debug-nodeps: DEBUG_RAMDISK_ROOT_DIR := $(my_debug_ramdisk_root_dir)
-ramdisk_debug-nodeps: $(MKBOOTFS) | $(MINIGZIP)
+ramdisk_debug-nodeps: $(MKBOOTFS) | $(COMPRESSION_COMMAND_DEPS)
 	echo "make $@: ignoring dependencies"
 	mkdir -p $(TARGET_DEBUG_RAMDISK_OUT)
 	touch $(TARGET_DEBUG_RAMDISK_OUT)/force_debuggable
 	rsync -a $(DEBUG_RAMDISK_SYNC_DIR)/ $(DEBUG_RAMDISK_ROOT_DIR)
-	$(MKBOOTFS) -d $(TARGET_OUT) $(DEBUG_RAMDISK_ROOT_DIR) | $(MINIGZIP) > $(INSTALLED_DEBUG_RAMDISK_TARGET)
+	$(MKBOOTFS) -d $(TARGET_OUT) $(DEBUG_RAMDISK_ROOT_DIR) | $(COMPRESSION_COMMAND) > $(INSTALLED_DEBUG_RAMDISK_TARGET)
 
 my_debug_ramdisk_sync_dir :=
 my_debug_ramdisk_root_dir :=
@@ -1935,7 +1963,7 @@
 # -----------------------------------------------------------------
 # vendor debug ramdisk
 # Combines vendor ramdisk files and debug ramdisk files to build the vendor debug ramdisk.
-INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET := $(PRODUCT_OUT)/vendor-ramdisk-debug.cpio.gz
+INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET := $(PRODUCT_OUT)/vendor-ramdisk-debug.cpio$(RAMDISK_EXT)
 $(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET): DEBUG_RAMDISK_FILES := $(INTERNAL_DEBUG_RAMDISK_FILES)
 $(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET): VENDOR_RAMDISK_DIR := $(TARGET_VENDOR_RAMDISK_OUT)
 
@@ -1949,14 +1977,14 @@
 # $(PRODUCT_OUT)/vendor_debug_ramdisk.
 $(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET): VENDOR_DEBUG_RAMDISK_DIR := $(PRODUCT_OUT)/vendor_debug_ramdisk
 $(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET): $(INTERNAL_VENDOR_RAMDISK_TARGET) $(INSTALLED_DEBUG_RAMDISK_TARGET)
-$(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET): $(MKBOOTFS) $(INTERNAL_VENDOR_DEBUG_RAMDISK_FILES) | $(MINIGZIP)
+$(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET): $(MKBOOTFS) $(INTERNAL_VENDOR_DEBUG_RAMDISK_FILES) | $(COMPRESSION_COMMAND_DEPS)
 	$(call pretty,"Target vendor debug ram disk: $@")
 	mkdir -p $(TARGET_VENDOR_DEBUG_RAMDISK_OUT)
 	touch $(TARGET_VENDOR_DEBUG_RAMDISK_OUT)/force_debuggable
 	$(foreach debug_file,$(DEBUG_RAMDISK_FILES), \
 	  cp -f $(debug_file) $(subst $(PRODUCT_OUT)/debug_ramdisk,$(PRODUCT_OUT)/vendor_debug_ramdisk,$(debug_file)) &&) true
 	rsync -a $(VENDOR_RAMDISK_DIR)/ $(VENDOR_DEBUG_RAMDISK_DIR)
-	$(MKBOOTFS) -d $(TARGET_OUT) $(VENDOR_DEBUG_RAMDISK_DIR) | $(MINIGZIP) > $@
+	$(MKBOOTFS) -d $(TARGET_OUT) $(VENDOR_DEBUG_RAMDISK_DIR) | $(COMPRESSION_COMMAND) > $@
 
 INSTALLED_FILES_FILE_VENDOR_DEBUG_RAMDISK := $(PRODUCT_OUT)/installed-files-vendor-ramdisk-debug.txt
 INSTALLED_FILES_JSON_VENDOR_DEBUG_RAMDISK := $(INSTALLED_FILES_FILE_VENDOR_DEBUG_RAMDISK:.txt=.json)
@@ -2034,18 +2062,18 @@
 endef
 
 $(INSTALLED_TEST_HARNESS_RAMDISK_TARGET): $(INSTALLED_DEBUG_RAMDISK_TARGET)
-$(INSTALLED_TEST_HARNESS_RAMDISK_TARGET): $(MKBOOTFS) $(INTERNAL_TEST_HARNESS_RAMDISK_FILES) | $(MINIGZIP)
+$(INSTALLED_TEST_HARNESS_RAMDISK_TARGET): $(MKBOOTFS) $(INTERNAL_TEST_HARNESS_RAMDISK_FILES) | $(COMPRESSION_COMMAND_DEPS)
 	$(call pretty,"Target test harness ram disk: $@")
 	rsync -a $(TEST_HARNESS_RAMDISK_SYNC_DIR)/ $(TEST_HARNESS_RAMDISK_ROOT_DIR)
 	$(call append-test-harness-props,$(ADDITIONAL_TEST_HARNESS_PROPERTIES),$(TEST_HARNESS_PROP_TARGET))
-	$(MKBOOTFS) -d $(TARGET_OUT) $(TEST_HARNESS_RAMDISK_ROOT_DIR) | $(MINIGZIP) > $@
+	$(MKBOOTFS) -d $(TARGET_OUT) $(TEST_HARNESS_RAMDISK_ROOT_DIR) | $(COMPRESSION_COMMAND) > $@
 
 .PHONY: ramdisk_test_harness-nodeps
-ramdisk_test_harness-nodeps: $(MKBOOTFS) | $(MINIGZIP)
+ramdisk_test_harness-nodeps: $(MKBOOTFS) | $(COMPRESSION_COMMAND_DEPS)
 	echo "make $@: ignoring dependencies"
 	rsync -a $(TEST_HARNESS_RAMDISK_SYNC_DIR)/ $(TEST_HARNESS_RAMDISK_ROOT_DIR)
 	$(call append-test-harness-props,$(ADDITIONAL_TEST_HARNESS_PROPERTIES),$(TEST_HARNESS_PROP_TARGET))
-	$(MKBOOTFS) -d $(TARGET_OUT) $(TEST_HARNESS_RAMDISK_ROOT_DIR) | $(MINIGZIP) > $(INSTALLED_TEST_HARNESS_RAMDISK_TARGET)
+	$(MKBOOTFS) -d $(TARGET_OUT) $(TEST_HARNESS_RAMDISK_ROOT_DIR) | $(COMPRESSION_COMMAND) > $(INSTALLED_TEST_HARNESS_RAMDISK_TARGET)
 
 endif # BUILDING_RAMDISK_IMAGE
 
@@ -3566,6 +3594,7 @@
   aapt2 \
   add_img_to_target_files \
   aftltool \
+  apksigner \
   append2simg \
   avbtool \
   blk_alloc_to_base_fs \
diff --git a/core/config.mk b/core/config.mk
index d707275..5be1b86 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -605,6 +605,7 @@
 VTSC := $(HOST_OUT_EXECUTABLES)/vtsc$(HOST_EXECUTABLE_SUFFIX)
 MKBOOTFS := $(HOST_OUT_EXECUTABLES)/mkbootfs$(HOST_EXECUTABLE_SUFFIX)
 MINIGZIP := $(HOST_OUT_EXECUTABLES)/minigzip$(HOST_EXECUTABLE_SUFFIX)
+LZ4 := $(HOST_OUT_EXECUTABLES)/lz4$(HOST_EXECUTABLE_SUFFIX)
 ifeq (,$(strip $(BOARD_CUSTOM_MKBOOTIMG)))
 MKBOOTIMG := $(HOST_OUT_EXECUTABLES)/mkbootimg$(HOST_EXECUTABLE_SUFFIX)
 else
diff --git a/core/construct_context.sh b/core/construct_context.sh
index 794795a..d620d08 100755
--- a/core/construct_context.sh
+++ b/core/construct_context.sh
@@ -67,6 +67,10 @@
   add_to_contexts "${conditional_host_libs_29}" "${conditional_target_libs_29}"
 fi
 
+if [[ "${target_sdk_version}" -lt "30" ]]; then
+  add_to_contexts "${conditional_host_libs_30}" "${conditional_target_libs_30}"
+fi
+
 add_to_contexts "${dex_preopt_host_libraries}" "${dex_preopt_target_libraries}"
 
 # Generate the actual context string.
diff --git a/core/definitions.mk b/core/definitions.mk
index 1467e96..3672900 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -2693,32 +2693,6 @@
 	$$(transform-prebuilt-to-target)
 endef
 
-
-###########################################################
-## API Check
-###########################################################
-
-# eval this to define a rule that runs apicheck.
-#
-# Args:
-#    $(1)  target
-#    $(2)  stable api file
-#    $(3)  api file to be tested
-#    $(4)  stable removed api file
-#    $(5)  removed api file to be tested
-#    $(6)  arguments for apicheck
-#    $(7)  command to run if apicheck failed
-#    $(8)  target dependent on this api check
-#    $(9)  additional dependencies
-define check-api
-$(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/$(strip $(1))-timestamp: $(2) $(3) $(4) $(APICHECK) $(9)
-	@echo "Checking API:" $(1)
-	$(hide) ( $(APICHECK_COMMAND) --check-api-files $(6) $(2) $(3) $(4) $(5) || ( $(7) ; exit 38 ) )
-	$(hide) mkdir -p $$(dir $$@)
-	$(hide) touch $$@
-$(8): $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/$(strip $(1))-timestamp
-endef
-
 ## Whether to build from source if prebuilt alternative exists
 ###########################################################
 # $(1): module name
diff --git a/core/dex_preopt_odex_install.mk b/core/dex_preopt_odex_install.mk
index a33b2b4..2a2427d 100644
--- a/core/dex_preopt_odex_install.mk
+++ b/core/dex_preopt_odex_install.mk
@@ -195,6 +195,7 @@
     org.apache.http.legacy \
     android.hidl.base-V1.0-java \
     android.hidl.manager-V1.0-java \
+    android.test.base \
 
   my_dexpreopt_libs := $(sort \
     $(LOCAL_USES_LIBRARIES) \
diff --git a/core/main.mk b/core/main.mk
index 9c52b01..67bcb39 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -111,44 +111,38 @@
 endif
 endif
 
-#
-# -----------------------------------------------------------------
-# Validate ADDITIONAL_DEFAULT_PROPERTIES.
-ifneq ($(ADDITIONAL_DEFAULT_PROPERTIES),)
-$(error ADDITIONAL_DEFAULT_PROPERTIES is deprecated)
-endif
+# ADDITIONAL_<partition>_PROPERTIES are properties that are determined by the
+# build system itself. Don't let it be defined from outside of the core build
+# system like Android.mk or <product>.mk files.
+_additional_prop_var_names := \
+    ADDITIONAL_SYSTEM_PROPERTIES \
+    ADDITIONAL_VENDOR_PROPERTIES \
+    ADDITIONAL_ODM_PROPERTIES \
+    ADDITIONAL_PRODUCT_PROPERTIES
 
-#
-# -----------------------------------------------------------------
-# Validate ADDITIONAL_BUILD_PROPERTIES.
-ifneq ($(ADDITIONAL_BUILD_PROPERTIES),)
-$(error ADDITIONAL_BUILD_PROPERTIES must not be set before here: $(ADDITIONAL_BUILD_PROPERTIES))
-endif
+$(foreach name, $(_additional_prop_var_names),\
+  $(if $($(name)),\
+    $(error $(name) must not set before here. $($(name)))\
+  ,)\
+  $(eval $(name) :=)\
+)
+_additional_prop_var_names :=
 
-ADDITIONAL_BUILD_PROPERTIES :=
-
-#
-# -----------------------------------------------------------------
-# Validate ADDITIONAL_PRODUCT_PROPERTIES.
-ifneq ($(ADDITIONAL_PRODUCT_PROPERTIES),)
-$(error ADDITIONAL_PRODUCT_PROPERTIES must not be set before here: $(ADDITIONAL_PRODUCT_PROPERTIES))
-endif
-
-ADDITIONAL_PRODUCT_PROPERTIES :=
+$(KATI_obsolete_var ADDITIONAL_BUILD_PROPERTIES, Please use ADDITIONAL_SYSTEM_PROPERTIES)
 
 #
 # -----------------------------------------------------------------
 # Add the product-defined properties to the build properties.
 ifdef PRODUCT_SHIPPING_API_LEVEL
-ADDITIONAL_BUILD_PROPERTIES += \
+ADDITIONAL_SYSTEM_PROPERTIES += \
   ro.product.first_api_level=$(PRODUCT_SHIPPING_API_LEVEL)
 endif
 
 ifneq ($(BOARD_PROPERTY_OVERRIDES_SPLIT_ENABLED), true)
-  ADDITIONAL_BUILD_PROPERTIES += $(PRODUCT_PROPERTY_OVERRIDES)
+  ADDITIONAL_SYSTEM_PROPERTIES += $(PRODUCT_PROPERTY_OVERRIDES)
 else
   ifndef BOARD_VENDORIMAGE_FILE_SYSTEM_TYPE
-    ADDITIONAL_BUILD_PROPERTIES += $(PRODUCT_PROPERTY_OVERRIDES)
+    ADDITIONAL_SYSTEM_PROPERTIES += $(PRODUCT_PROPERTY_OVERRIDES)
   endif
 endif
 
@@ -197,7 +191,7 @@
 
 # -----------------------------------------------------------------
 
-ADDITIONAL_BUILD_PROPERTIES += ro.treble.enabled=${PRODUCT_FULL_TREBLE}
+ADDITIONAL_SYSTEM_PROPERTIES += ro.treble.enabled=${PRODUCT_FULL_TREBLE}
 
 $(KATI_obsolete_var PRODUCT_FULL_TREBLE,\
 	Code should be written to work regardless of a device being Treble or \
@@ -207,9 +201,9 @@
 # Sets ro.actionable_compatible_property.enabled to know on runtime whether the whitelist
 # of actionable compatible properties is enabled or not.
 ifeq ($(PRODUCT_ACTIONABLE_COMPATIBLE_PROPERTY_DISABLE),true)
-ADDITIONAL_BUILD_PROPERTIES += ro.actionable_compatible_property.enabled=false
+ADDITIONAL_SYSTEM_PROPERTIES += ro.actionable_compatible_property.enabled=false
 else
-ADDITIONAL_BUILD_PROPERTIES += ro.actionable_compatible_property.enabled=${PRODUCT_COMPATIBLE_PROPERTY}
+ADDITIONAL_SYSTEM_PROPERTIES += ro.actionable_compatible_property.enabled=${PRODUCT_COMPATIBLE_PROPERTY}
 endif
 
 # Add the system server compiler filter if they are specified for the product.
@@ -219,7 +213,7 @@
 
 # Enable core platform API violation warnings on userdebug and eng builds.
 ifneq ($(TARGET_BUILD_VARIANT),user)
-ADDITIONAL_BUILD_PROPERTIES += persist.debug.dalvik.vm.core_platform_api_policy=just-warn
+ADDITIONAL_SYSTEM_PROPERTIES += persist.debug.dalvik.vm.core_platform_api_policy=just-warn
 endif
 
 # Sets the default value of ro.postinstall.fstab.prefix to /system.
@@ -229,7 +223,100 @@
 #
 # It then uses ${ro.postinstall.fstab.prefix}/etc/fstab.postinstall to
 # mount system_other partition.
-ADDITIONAL_BUILD_PROPERTIES += ro.postinstall.fstab.prefix=/system
+ADDITIONAL_SYSTEM_PROPERTIES += ro.postinstall.fstab.prefix=/system
+
+# -----------------------------------------------------------------
+# ADDITIONAL_VENDOR_PROPERTIES will be installed in vendor/build.prop if
+# property_overrides_split_enabled is true. Otherwise it will be installed in
+# /system/build.prop
+ifdef BOARD_VNDK_VERSION
+  ifeq ($(BOARD_VNDK_VERSION),current)
+    ADDITIONAL_VENDOR_PROPERTIES := ro.vndk.version=$(PLATFORM_VNDK_VERSION)
+  else
+    ADDITIONAL_VENDOR_PROPERTIES := ro.vndk.version=$(BOARD_VNDK_VERSION)
+  endif
+  ifdef BOARD_VNDK_RUNTIME_DISABLE
+    ADDITIONAL_VENDOR_PROPERTIES += ro.vndk.lite=true
+  endif
+else
+  ADDITIONAL_VENDOR_PROPERTIES := ro.vndk.version=$(PLATFORM_VNDK_VERSION)
+  ADDITIONAL_VENDOR_PROPERTIES += ro.vndk.lite=true
+endif
+ADDITIONAL_VENDOR_PROPERTIES += \
+    $(call collapse-pairs, $(PRODUCT_DEFAULT_PROPERTY_OVERRIDES))
+
+# Add cpu properties for bionic and ART.
+ADDITIONAL_VENDOR_PROPERTIES += ro.bionic.arch=$(TARGET_ARCH)
+ADDITIONAL_VENDOR_PROPERTIES += ro.bionic.cpu_variant=$(TARGET_CPU_VARIANT_RUNTIME)
+ADDITIONAL_VENDOR_PROPERTIES += ro.bionic.2nd_arch=$(TARGET_2ND_ARCH)
+ADDITIONAL_VENDOR_PROPERTIES += ro.bionic.2nd_cpu_variant=$(TARGET_2ND_CPU_VARIANT_RUNTIME)
+
+ADDITIONAL_VENDOR_PROPERTIES += persist.sys.dalvik.vm.lib.2=libart.so
+ADDITIONAL_VENDOR_PROPERTIES += dalvik.vm.isa.$(TARGET_ARCH).variant=$(DEX2OAT_TARGET_CPU_VARIANT_RUNTIME)
+ifneq ($(DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES),)
+  ADDITIONAL_VENDOR_PROPERTIES += dalvik.vm.isa.$(TARGET_ARCH).features=$(DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES)
+endif
+
+ifdef TARGET_2ND_ARCH
+  ADDITIONAL_VENDOR_PROPERTIES += dalvik.vm.isa.$(TARGET_2ND_ARCH).variant=$($(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_CPU_VARIANT_RUNTIME)
+  ifneq ($($(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES),)
+    ADDITIONAL_VENDOR_PROPERTIES += dalvik.vm.isa.$(TARGET_2ND_ARCH).features=$($(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES)
+  endif
+endif
+
+# Although these variables are prefixed with TARGET_RECOVERY_, they are also needed under charger
+# mode (via libminui).
+ifdef TARGET_RECOVERY_DEFAULT_ROTATION
+ADDITIONAL_VENDOR_PROPERTIES += \
+    ro.minui.default_rotation=$(TARGET_RECOVERY_DEFAULT_ROTATION)
+endif
+ifdef TARGET_RECOVERY_OVERSCAN_PERCENT
+ADDITIONAL_VENDOR_PROPERTIES += \
+    ro.minui.overscan_percent=$(TARGET_RECOVERY_OVERSCAN_PERCENT)
+endif
+ifdef TARGET_RECOVERY_PIXEL_FORMAT
+ADDITIONAL_VENDOR_PROPERTIES += \
+    ro.minui.pixel_format=$(TARGET_RECOVERY_PIXEL_FORMAT)
+endif
+
+ifdef PRODUCT_USE_DYNAMIC_PARTITIONS
+ADDITIONAL_VENDOR_PROPERTIES += \
+    ro.boot.dynamic_partitions=$(PRODUCT_USE_DYNAMIC_PARTITIONS)
+endif
+
+ifdef PRODUCT_RETROFIT_DYNAMIC_PARTITIONS
+ADDITIONAL_VENDOR_PROPERTIES += \
+    ro.boot.dynamic_partitions_retrofit=$(PRODUCT_RETROFIT_DYNAMIC_PARTITIONS)
+endif
+
+ifdef PRODUCT_SHIPPING_API_LEVEL
+ADDITIONAL_VENDOR_PROPERTIES += \
+    ro.product.first_api_level=$(PRODUCT_SHIPPING_API_LEVEL)
+endif
+
+ADDITIONAL_VENDOR_PROPERTIES += \
+    ro.vendor.build.security_patch=$(VENDOR_SECURITY_PATCH) \
+    ro.vendor.product.cpu.abilist=$(TARGET_CPU_ABI_LIST) \
+    ro.vendor.product.cpu.abilist32=$(TARGET_CPU_ABI_LIST_32_BIT) \
+    ro.vendor.product.cpu.abilist64=$(TARGET_CPU_ABI_LIST_64_BIT) \
+    ro.product.board=$(TARGET_BOOTLOADER_BOARD_NAME) \
+    ro.board.platform=$(TARGET_BOARD_PLATFORM) \
+    ro.hwui.use_vulkan=$(TARGET_USES_VULKAN)
+
+ifdef TARGET_SCREEN_DENSITY
+ADDITIONAL_VENDOR_PROPERTIES += \
+    ro.sf.lcd_density=$(TARGET_SCREEN_DENSITY)
+endif
+
+ifdef AB_OTA_UPDATER
+ADDITIONAL_VENDOR_PROPERTIES += \
+    ro.build.ab_update=$(AB_OTA_UPDATER)
+endif
+
+ADDITIONAL_ODM_PROPERTIES += \
+    ro.odm.product.cpu.abilist=$(TARGET_CPU_ABI_LIST) \
+    ro.odm.product.cpu.abilist32=$(TARGET_CPU_ABI_LIST_32_BIT) \
+    ro.odm.product.cpu.abilist64=$(TARGET_CPU_ABI_LIST_64_BIT)
 
 # Set ro.product.vndk.version to know the VNDK version required by product
 # modules. It uses the version in PRODUCT_PRODUCT_VNDK_VERSION. If the value
@@ -261,11 +348,11 @@
 tags_to_install :=
 ifneq (,$(user_variant))
   # Target is secure in user builds.
-  ADDITIONAL_BUILD_PROPERTIES += ro.secure=1
-  ADDITIONAL_BUILD_PROPERTIES += security.perf_harden=1
+  ADDITIONAL_SYSTEM_PROPERTIES += ro.secure=1
+  ADDITIONAL_SYSTEM_PROPERTIES += security.perf_harden=1
 
   ifeq ($(user_variant),user)
-    ADDITIONAL_BUILD_PROPERTIES += ro.adb.secure=1
+    ADDITIONAL_SYSTEM_PROPERTIES += ro.adb.secure=1
   endif
 
   ifeq ($(user_variant),userdebug)
@@ -277,40 +364,40 @@
   endif
 
   # Disallow mock locations by default for user builds
-  ADDITIONAL_BUILD_PROPERTIES += ro.allow.mock.location=0
+  ADDITIONAL_SYSTEM_PROPERTIES += ro.allow.mock.location=0
 
 else # !user_variant
   # Turn on checkjni for non-user builds.
-  ADDITIONAL_BUILD_PROPERTIES += ro.kernel.android.checkjni=1
+  ADDITIONAL_SYSTEM_PROPERTIES += ro.kernel.android.checkjni=1
   # Set device insecure for non-user builds.
-  ADDITIONAL_BUILD_PROPERTIES += ro.secure=0
+  ADDITIONAL_SYSTEM_PROPERTIES += ro.secure=0
   # Allow mock locations by default for non user builds
-  ADDITIONAL_BUILD_PROPERTIES += ro.allow.mock.location=1
+  ADDITIONAL_SYSTEM_PROPERTIES += ro.allow.mock.location=1
 endif # !user_variant
 
 ifeq (true,$(strip $(enable_target_debugging)))
   # Target is more debuggable and adbd is on by default
-  ADDITIONAL_BUILD_PROPERTIES += ro.debuggable=1
+  ADDITIONAL_SYSTEM_PROPERTIES += ro.debuggable=1
   # Enable Dalvik lock contention logging.
-  ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.lockprof.threshold=500
+  ADDITIONAL_SYSTEM_PROPERTIES += dalvik.vm.lockprof.threshold=500
 else # !enable_target_debugging
   # Target is less debuggable and adbd is off by default
-  ADDITIONAL_BUILD_PROPERTIES += ro.debuggable=0
+  ADDITIONAL_SYSTEM_PROPERTIES += ro.debuggable=0
 endif # !enable_target_debugging
 
 ## eng ##
 
 ifeq ($(TARGET_BUILD_VARIANT),eng)
 tags_to_install := debug eng
-ifneq ($(filter ro.setupwizard.mode=ENABLED, $(call collapse-pairs, $(ADDITIONAL_BUILD_PROPERTIES))),)
+ifneq ($(filter ro.setupwizard.mode=ENABLED, $(call collapse-pairs, $(ADDITIONAL_SYSTEM_PROPERTIES))),)
   # Don't require the setup wizard on eng builds
-  ADDITIONAL_BUILD_PROPERTIES := $(filter-out ro.setupwizard.mode=%,\
-          $(call collapse-pairs, $(ADDITIONAL_BUILD_PROPERTIES))) \
+  ADDITIONAL_SYSTEM_PROPERTIES := $(filter-out ro.setupwizard.mode=%,\
+          $(call collapse-pairs, $(ADDITIONAL_SYSTEM_PROPERTIES))) \
           ro.setupwizard.mode=OPTIONAL
 endif
 ifndef is_sdk_build
   # To speedup startup of non-preopted builds, don't verify or compile the boot image.
-  ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.image-dex2oat-filter=extract
+  ADDITIONAL_SYSTEM_PROPERTIES += dalvik.vm.image-dex2oat-filter=extract
 endif
 endif
 
@@ -347,14 +434,14 @@
 # TODO: this should be eng I think.  Since the sdk is built from the eng
 # variant.
 tags_to_install := debug eng
-ADDITIONAL_BUILD_PROPERTIES += xmpp.auto-presence=true
-ADDITIONAL_BUILD_PROPERTIES += ro.config.nocheckin=yes
+ADDITIONAL_SYSTEM_PROPERTIES += xmpp.auto-presence=true
+ADDITIONAL_SYSTEM_PROPERTIES += ro.config.nocheckin=yes
 else # !sdk
 endif
 
 BUILD_WITHOUT_PV := true
 
-ADDITIONAL_BUILD_PROPERTIES += net.bt.name=Android
+ADDITIONAL_SYSTEM_PROPERTIES += net.bt.name=Android
 
 # ------------------------------------------------------------
 # Define a function that, given a list of module tags, returns
@@ -388,8 +475,8 @@
 
 # Strip and readonly a few more variables so they won't be modified.
 $(readonly-final-product-vars)
-ADDITIONAL_BUILD_PROPERTIES := $(strip $(ADDITIONAL_BUILD_PROPERTIES))
-.KATI_READONLY := ADDITIONAL_BUILD_PROPERTIES
+ADDITIONAL_SYSTEM_PROPERTIES := $(strip $(ADDITIONAL_SYSTEM_PROPERTIES))
+.KATI_READONLY := ADDITIONAL_SYSTEM_PROPERTIES
 ADDITIONAL_PRODUCT_PROPERTIES := $(strip $(ADDITIONAL_PRODUCT_PROPERTIES))
 .KATI_READONLY := ADDITIONAL_PRODUCT_PROPERTIES
 
@@ -1157,13 +1244,12 @@
       _modules := $(patsubst %:64,%,$(_modules))
       # Sanity check all modules in PRODUCT_PACKAGES exist. We check for the
       # existence if either <module> or the <module>_32 variant.
-      _nonexistent_modules := $(filter-out $(ALL_MODULES),$(_modules))
-      _nonexistent_modules := $(foreach m,$(_nonexistent_modules),\
-        $(if $(call get-32-bit-modules,$(m)),,$(m)))
+      _nonexistent_modules := $(foreach m,$(_modules), \
+        $(if $(or $(ALL_MODULES.$(m).PATH),$(call get-modules-for-2nd-arch,TARGET,$(m))),,$(m)))
       $(call maybe-print-list-and-error,$(filter-out $(_whitelist),$(_nonexistent_modules)),\
         $(INTERNAL_PRODUCT) includes non-existent modules in PRODUCT_PACKAGES)
       $(call maybe-print-list-and-error,$(filter-out $(_nonexistent_modules),$(_whitelist)),\
-        $(INTERNAL_PRODUCT) includes redundant whitelist entries for nonexistent PRODUCT_PACKAGES)
+        $(INTERNAL_PRODUCT) includes redundant whitelist entries for non-existent PRODUCT_PACKAGES)
     endif
 
     # Check to ensure that all modules in PRODUCT_HOST_PACKAGES exist
diff --git a/core/pathmap.mk b/core/pathmap.mk
index af33f5d..dacbe21 100644
--- a/core/pathmap.mk
+++ b/core/pathmap.mk
@@ -40,7 +40,6 @@
     libhardware:hardware/libhardware/include \
     libhardware_legacy:hardware/libhardware_legacy/include \
     libril:hardware/ril/include \
-    recovery:bootable/recovery \
     system-core:system/core/include \
     audio:system/media/audio/include \
     audio-effects:system/media/audio_effects/include \
diff --git a/core/product.mk b/core/product.mk
index 0aa07ef..9c54849 100644
--- a/core/product.mk
+++ b/core/product.mk
@@ -458,8 +458,8 @@
     $(sort $(ARTIFACT_PATH_REQUIREMENT_PRODUCTS) $(current_mk)))
 endef
 
-# Makes including non-existant modules in PRODUCT_PACKAGES an error.
-# $(1): whitelist of non-existant modules to allow.
+# Makes including non-existent modules in PRODUCT_PACKAGES an error.
+# $(1): whitelist of non-existent modules to allow.
 define enforce-product-packages-exist
   $(eval current_mk := $(strip $(word 1,$(_include_stack)))) \
   $(eval PRODUCTS.$(current_mk).PRODUCT_ENFORCE_PACKAGES_EXIST := true) \
diff --git a/core/sysprop.mk b/core/sysprop.mk
index 4311572..ad3e8c9 100644
--- a/core/sysprop.mk
+++ b/core/sysprop.mk
@@ -23,65 +23,9 @@
   property_overrides_split_enabled := true
 endif
 
-# -----------------------------------------------------------------
-# FINAL_VENDOR_DEFAULT_PROPERTIES will be installed in vendor/build.prop if
-# property_overrides_split_enabled is true. Otherwise it will be installed in
-# /system/build.prop
-ifdef BOARD_VNDK_VERSION
-  ifeq ($(BOARD_VNDK_VERSION),current)
-    FINAL_VENDOR_DEFAULT_PROPERTIES := ro.vndk.version=$(PLATFORM_VNDK_VERSION)
-  else
-    FINAL_VENDOR_DEFAULT_PROPERTIES := ro.vndk.version=$(BOARD_VNDK_VERSION)
-  endif
-  ifdef BOARD_VNDK_RUNTIME_DISABLE
-    FINAL_VENDOR_DEFAULT_PROPERTIES += ro.vndk.lite=true
-  endif
-else
-  FINAL_VENDOR_DEFAULT_PROPERTIES := ro.vndk.version=$(PLATFORM_VNDK_VERSION)
-  FINAL_VENDOR_DEFAULT_PROPERTIES += ro.vndk.lite=true
-endif
-FINAL_VENDOR_DEFAULT_PROPERTIES += \
-    $(call collapse-pairs, $(PRODUCT_DEFAULT_PROPERTY_OVERRIDES))
-
-# Add cpu properties for bionic and ART.
-FINAL_VENDOR_DEFAULT_PROPERTIES += ro.bionic.arch=$(TARGET_ARCH)
-FINAL_VENDOR_DEFAULT_PROPERTIES += ro.bionic.cpu_variant=$(TARGET_CPU_VARIANT_RUNTIME)
-FINAL_VENDOR_DEFAULT_PROPERTIES += ro.bionic.2nd_arch=$(TARGET_2ND_ARCH)
-FINAL_VENDOR_DEFAULT_PROPERTIES += ro.bionic.2nd_cpu_variant=$(TARGET_2ND_CPU_VARIANT_RUNTIME)
-
-FINAL_VENDOR_DEFAULT_PROPERTIES += persist.sys.dalvik.vm.lib.2=libart.so
-FINAL_VENDOR_DEFAULT_PROPERTIES += dalvik.vm.isa.$(TARGET_ARCH).variant=$(DEX2OAT_TARGET_CPU_VARIANT_RUNTIME)
-ifneq ($(DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES),)
-  FINAL_VENDOR_DEFAULT_PROPERTIES += dalvik.vm.isa.$(TARGET_ARCH).features=$(DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES)
-endif
-
-ifdef TARGET_2ND_ARCH
-  FINAL_VENDOR_DEFAULT_PROPERTIES += dalvik.vm.isa.$(TARGET_2ND_ARCH).variant=$($(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_CPU_VARIANT_RUNTIME)
-  ifneq ($($(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES),)
-    FINAL_VENDOR_DEFAULT_PROPERTIES += dalvik.vm.isa.$(TARGET_2ND_ARCH).features=$($(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES)
-  endif
-endif
-
-# Although these variables are prefixed with TARGET_RECOVERY_, they are also needed under charger
-# mode (via libminui).
-ifdef TARGET_RECOVERY_DEFAULT_ROTATION
-FINAL_VENDOR_DEFAULT_PROPERTIES += \
-    ro.minui.default_rotation=$(TARGET_RECOVERY_DEFAULT_ROTATION)
-endif
-ifdef TARGET_RECOVERY_OVERSCAN_PERCENT
-FINAL_VENDOR_DEFAULT_PROPERTIES += \
-    ro.minui.overscan_percent=$(TARGET_RECOVERY_OVERSCAN_PERCENT)
-endif
-ifdef TARGET_RECOVERY_PIXEL_FORMAT
-FINAL_VENDOR_DEFAULT_PROPERTIES += \
-    ro.minui.pixel_format=$(TARGET_RECOVERY_PIXEL_FORMAT)
-endif
-FINAL_VENDOR_DEFAULT_PROPERTIES := $(call uniq-pairs-by-first-component, \
-    $(FINAL_VENDOR_DEFAULT_PROPERTIES),=)
-
 BUILDINFO_SH := build/make/tools/buildinfo.sh
 BUILDINFO_COMMON_SH := build/make/tools/buildinfo_common.sh
-POST_PROCESS_PROPS :=$= build/make/tools/post_process_props.py
+POST_PROCESS_PROPS := $(HOST_OUT_EXECUTABLES)/post_process_props$(HOST_EXECUTABLE_SUFFIX)
 
 # Generates a set of sysprops common to all partitions to a file.
 # $(1): Partition name
@@ -123,7 +67,14 @@
     $(FINAL_DEFAULT_PROPERTIES),=)
 
 FINAL_BUILD_PROPERTIES := \
-    $(call collapse-pairs, $(ADDITIONAL_BUILD_PROPERTIES))
+    $(call collapse-pairs, $(ADDITIONAL_SYSTEM_PROPERTIES))
+
+# For non-Treble devices, consider vendor properties as system properties
+ifndef property_overrides_split_enabled
+FINAL_BUILD_PROPERTIES += \
+    $(call collapse-pairs, $(ADDITIONAL_VENDOR_PROPERTIES))
+endif
+
 FINAL_BUILD_PROPERTIES := $(call uniq-pairs-by-first-component, \
     $(FINAL_BUILD_PROPERTIES),=)
 
@@ -237,10 +188,6 @@
 	$(hide) rm -f $@ && touch $@
 	$(hide) $(foreach line,$(FINAL_DEFAULT_PROPERTIES), \
 	    echo "$(line)" >> $@;)
-ifndef property_overrides_split_enabled
-	$(hide) $(foreach line,$(FINAL_VENDOR_DEFAULT_PROPERTIES), \
-	    echo "$(line)" >> $@;)
-endif
 ifneq ($(PRODUCT_OEM_PROPERTIES),)
 	$(hide) echo "#" >> $@; \
 	        echo "# PRODUCT_OEM_PROPERTIES" >> $@; \
@@ -298,7 +245,7 @@
 	$(if $(FINAL_BUILD_PROPERTIES), \
 	    $(hide) echo >> $@; \
 	            echo "#" >> $@; \
-	            echo "# ADDITIONAL_BUILD_PROPERTIES" >> $@; \
+	            echo "# ADDITIONAL_SYSTEM_PROPERTIES" >> $@; \
 	            echo "#" >> $@; )
 	$(hide) $(foreach line,$(FINAL_BUILD_PROPERTIES), \
 	    echo "$(line)" >> $@;)
@@ -323,52 +270,27 @@
 vendor_prop_files := $(wildcard $(TARGET_DEVICE_DIR)/vendor.prop)
 endif
 
+android_info_prop := $(call intermediates-dir-for,ETC,android_info_prop)/android_info.prop
+$(android_info_prop): $(INSTALLED_ANDROID_INFO_TXT_TARGET)
+	cat $< | grep 'require version-' | sed -e 's/require version-/ro.build.expect./g' > $@
+
+vendor_prop_files += $(android_info_prop)
+
 ifdef property_overrides_split_enabled
 FINAL_VENDOR_BUILD_PROPERTIES += \
-    $(call collapse-pairs, $(PRODUCT_PROPERTY_OVERRIDES))
+    $(call collapse-pairs, $(PRODUCT_PROPERTY_OVERRIDES) $(ADDITIONAL_VENDOR_PROPERTIES))
 FINAL_VENDOR_BUILD_PROPERTIES := $(call uniq-pairs-by-first-component, \
     $(FINAL_VENDOR_BUILD_PROPERTIES),=)
 endif  # property_overrides_split_enabled
 
-$(INSTALLED_VENDOR_BUILD_PROP_TARGET): $(BUILDINFO_COMMON_SH) $(POST_PROCESS_PROPS) $(intermediate_system_build_prop) $(vendor_prop_files)
+$(INSTALLED_VENDOR_BUILD_PROP_TARGET): $(BUILDINFO_COMMON_SH) $(POST_PROCESS_PROPS) $(vendor_prop_files)
 	@echo Target vendor buildinfo: $@
 	@mkdir -p $(dir $@)
 	$(hide) rm -f $@ && touch $@
-ifdef property_overrides_split_enabled
-	$(hide) $(foreach line,$(FINAL_VENDOR_DEFAULT_PROPERTIES), \
-	  echo "$(line)" >> $@;)
-endif
-ifeq ($(PRODUCT_USE_DYNAMIC_PARTITIONS),true)
-	$(hide) echo ro.boot.dynamic_partitions=true >> $@
-endif
-ifeq ($(PRODUCT_RETROFIT_DYNAMIC_PARTITIONS),true)
-	$(hide) echo ro.boot.dynamic_partitions_retrofit=true >> $@
-endif
-	$(hide) grep 'ro.product.first_api_level' $(intermediate_system_build_prop) >> $@ || true
-	$(hide) echo ro.vendor.build.security_patch="$(VENDOR_SECURITY_PATCH)">>$@
-	$(hide) echo ro.vendor.product.cpu.abilist="$(TARGET_CPU_ABI_LIST)">>$@
-	$(hide) echo ro.vendor.product.cpu.abilist32="$(TARGET_CPU_ABI_LIST_32_BIT)">>$@
-	$(hide) echo ro.vendor.product.cpu.abilist64="$(TARGET_CPU_ABI_LIST_64_BIT)">>$@
-	$(hide) echo ro.product.board="$(TARGET_BOOTLOADER_BOARD_NAME)">>$@
-	$(hide) echo ro.board.platform="$(TARGET_BOARD_PLATFORM)">>$@
-	$(hide) echo ro.hwui.use_vulkan="$(TARGET_USES_VULKAN)">>$@
-ifdef TARGET_SCREEN_DENSITY
-	$(hide) echo ro.sf.lcd_density="$(TARGET_SCREEN_DENSITY)">>$@
-endif
-ifeq ($(AB_OTA_UPDATER),true)
-	$(hide) echo ro.build.ab_update=true >> $@
-endif
 	$(hide) $(call generate-common-build-props,vendor,$@)
 	$(hide) echo "#" >> $@; \
-	        echo "# BOOTIMAGE_BUILD_PROPERTIES" >> $@; \
-	        echo "#" >> $@;
-	$(hide) echo ro.bootimage.build.date=`$(DATE_FROM_FILE)`>>$@
-	$(hide) echo ro.bootimage.build.date.utc=`$(DATE_FROM_FILE) +%s`>>$@
-	$(hide) echo ro.bootimage.build.fingerprint="$(BUILD_FINGERPRINT_FROM_FILE)">>$@
-	$(hide) echo "#" >> $@; \
 	        echo "# ADDITIONAL VENDOR BUILD PROPERTIES" >> $@; \
 	        echo "#" >> $@;
-	$(hide) cat $(INSTALLED_ANDROID_INFO_TXT_TARGET) | grep 'require version-' | sed -e 's/require version-/ro.build.expect./g' >> $@
 ifdef property_overrides_split_enabled
 	$(hide) $(foreach file,$(vendor_prop_files), \
 	    if [ -f "$(file)" ]; then \
@@ -437,7 +359,7 @@
 endif
 
 FINAL_ODM_BUILD_PROPERTIES += \
-    $(call collapse-pairs, $(PRODUCT_ODM_PROPERTIES))
+    $(call collapse-pairs, $(PRODUCT_ODM_PROPERTIES) $(ADDITIONAL_ODM_PROPERTIES))
 FINAL_ODM_BUILD_PROPERTIES := $(call uniq-pairs-by-first-component, \
     $(FINAL_ODM_BUILD_PROPERTIES),=)
 
@@ -445,9 +367,6 @@
 	@echo Target odm buildinfo: $@
 	@mkdir -p $(dir $@)
 	$(hide) rm -f $@ && touch $@
-	$(hide) echo ro.odm.product.cpu.abilist="$(TARGET_CPU_ABI_LIST)">>$@
-	$(hide) echo ro.odm.product.cpu.abilist32="$(TARGET_CPU_ABI_LIST_32_BIT)">>$@
-	$(hide) echo ro.odm.product.cpu.abilist64="$(TARGET_CPU_ABI_LIST_64_BIT)">>$@
 	$(hide) $(call generate-common-build-props,odm,$@)
 	$(hide) $(foreach file,$(odm_prop_files), \
 	    if [ -f "$(file)" ]; then \
diff --git a/target/board/emulator_arm/AndroidBoard.mk b/target/board/emulator_arm/AndroidBoard.mk
new file mode 100644
index 0000000..7911f61
--- /dev/null
+++ b/target/board/emulator_arm/AndroidBoard.mk
@@ -0,0 +1 @@
+LOCAL_PATH := $(call my-dir)
diff --git a/target/board/emulator_arm/BoardConfig.mk b/target/board/emulator_arm/BoardConfig.mk
new file mode 100644
index 0000000..287824f
--- /dev/null
+++ b/target/board/emulator_arm/BoardConfig.mk
@@ -0,0 +1,37 @@
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# arm emulator specific definitions
+TARGET_ARCH := arm
+TARGET_ARCH_VARIANT := armv7-a-neon
+TARGET_CPU_VARIANT := generic
+TARGET_CPU_ABI := armeabi-v7a
+TARGET_CPU_ABI2 := armeabi
+
+include build/make/target/board/BoardConfigGsiCommon.mk
+include build/make/target/board/BoardConfigEmuCommon.mk
+
+BOARD_USERDATAIMAGE_PARTITION_SIZE := 576716800
+
+# Wifi.
+BOARD_WLAN_DEVICE           := emulator
+BOARD_HOSTAPD_DRIVER        := NL80211
+BOARD_WPA_SUPPLICANT_DRIVER := NL80211
+BOARD_HOSTAPD_PRIVATE_LIB   := lib_driver_cmd_simulated
+BOARD_WPA_SUPPLICANT_PRIVATE_LIB := lib_driver_cmd_simulated
+WPA_SUPPLICANT_VERSION      := VER_0_8_X
+WIFI_DRIVER_FW_PATH_PARAM   := "/dev/null"
+WIFI_DRIVER_FW_PATH_STA     := "/dev/null"
+WIFI_DRIVER_FW_PATH_AP      := "/dev/null"
diff --git a/target/board/emulator_arm/device.mk b/target/board/emulator_arm/device.mk
new file mode 100644
index 0000000..af023eb
--- /dev/null
+++ b/target/board/emulator_arm/device.mk
@@ -0,0 +1,18 @@
+#
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+PRODUCT_SOONG_NAMESPACES += device/generic/goldfish # for libwifi-hal-emu
+PRODUCT_SOONG_NAMESPACES += device/generic/goldfish-opengl # for goldfish deps.
diff --git a/target/board/emulator_arm/system_ext.prop b/target/board/emulator_arm/system_ext.prop
new file mode 100644
index 0000000..64829f3
--- /dev/null
+++ b/target/board/emulator_arm/system_ext.prop
@@ -0,0 +1,5 @@
+#
+# system.prop for generic sdk
+#
+
+rild.libpath=/vendor/lib/libreference-ril.so
diff --git a/target/board/emulator_x86/BoardConfig.mk b/target/board/emulator_x86/BoardConfig.mk
new file mode 100644
index 0000000..8f79166
--- /dev/null
+++ b/target/board/emulator_x86/BoardConfig.mk
@@ -0,0 +1,40 @@
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# x86 emulator specific definitions
+TARGET_CPU_ABI := x86
+TARGET_ARCH := x86
+TARGET_ARCH_VARIANT := x86
+
+TARGET_PRELINK_MODULE := false
+
+include build/make/target/board/BoardConfigGsiCommon.mk
+include build/make/target/board/BoardConfigEmuCommon.mk
+
+# Resize to 4G to accommodate ASAN and CTS
+BOARD_USERDATAIMAGE_PARTITION_SIZE := 4294967296
+
+BOARD_SEPOLICY_DIRS += device/generic/goldfish/sepolicy/x86
+
+# Wifi.
+BOARD_WLAN_DEVICE           := emulator
+BOARD_HOSTAPD_DRIVER        := NL80211
+BOARD_WPA_SUPPLICANT_DRIVER := NL80211
+BOARD_HOSTAPD_PRIVATE_LIB   := lib_driver_cmd_simulated
+BOARD_WPA_SUPPLICANT_PRIVATE_LIB := lib_driver_cmd_simulated
+WPA_SUPPLICANT_VERSION      := VER_0_8_X
+WIFI_DRIVER_FW_PATH_PARAM   := "/dev/null"
+WIFI_DRIVER_FW_PATH_STA     := "/dev/null"
+WIFI_DRIVER_FW_PATH_AP      := "/dev/null"
diff --git a/target/board/emulator_x86/device.mk b/target/board/emulator_x86/device.mk
new file mode 100644
index 0000000..7da09a9
--- /dev/null
+++ b/target/board/emulator_x86/device.mk
@@ -0,0 +1,27 @@
+#
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+PRODUCT_SOONG_NAMESPACES += device/generic/goldfish # for libwifi-hal-emu
+PRODUCT_SOONG_NAMESPACES += device/generic/goldfish-opengl # for goldfish deps.
+
+ifdef NET_ETH0_STARTONBOOT
+  PRODUCT_PROPERTY_OVERRIDES += net.eth0.startonboot=1
+endif
+
+# Ensure we package the BIOS files too.
+PRODUCT_HOST_PACKAGES += \
+	bios.bin \
+	vgabios-cirrus.bin \
diff --git a/target/board/emulator_x86/system_ext.prop b/target/board/emulator_x86/system_ext.prop
new file mode 100644
index 0000000..64829f3
--- /dev/null
+++ b/target/board/emulator_x86/system_ext.prop
@@ -0,0 +1,5 @@
+#
+# system.prop for generic sdk
+#
+
+rild.libpath=/vendor/lib/libreference-ril.so
diff --git a/target/board/emulator_x86_64/BoardConfig.mk b/target/board/emulator_x86_64/BoardConfig.mk
new file mode 100755
index 0000000..b9cbd8a
--- /dev/null
+++ b/target/board/emulator_x86_64/BoardConfig.mk
@@ -0,0 +1,42 @@
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# x86_64 emulator specific definitions
+TARGET_CPU_ABI := x86_64
+TARGET_ARCH := x86_64
+TARGET_ARCH_VARIANT := x86_64
+
+TARGET_2ND_CPU_ABI := x86
+TARGET_2ND_ARCH := x86
+TARGET_2ND_ARCH_VARIANT := x86_64
+
+TARGET_PRELINK_MODULE := false
+include build/make/target/board/BoardConfigGsiCommon.mk
+include build/make/target/board/BoardConfigEmuCommon.mk
+
+BOARD_USERDATAIMAGE_PARTITION_SIZE := 576716800
+
+BOARD_SEPOLICY_DIRS += device/generic/goldfish/sepolicy/x86
+
+# Wifi.
+BOARD_WLAN_DEVICE           := emulator
+BOARD_HOSTAPD_DRIVER        := NL80211
+BOARD_WPA_SUPPLICANT_DRIVER := NL80211
+BOARD_HOSTAPD_PRIVATE_LIB   := lib_driver_cmd_simulated
+BOARD_WPA_SUPPLICANT_PRIVATE_LIB := lib_driver_cmd_simulated
+WPA_SUPPLICANT_VERSION      := VER_0_8_X
+WIFI_DRIVER_FW_PATH_PARAM   := "/dev/null"
+WIFI_DRIVER_FW_PATH_STA     := "/dev/null"
+WIFI_DRIVER_FW_PATH_AP      := "/dev/null"
diff --git a/target/board/emulator_x86_64/device.mk b/target/board/emulator_x86_64/device.mk
new file mode 100755
index 0000000..7da09a9
--- /dev/null
+++ b/target/board/emulator_x86_64/device.mk
@@ -0,0 +1,27 @@
+#
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+PRODUCT_SOONG_NAMESPACES += device/generic/goldfish # for libwifi-hal-emu
+PRODUCT_SOONG_NAMESPACES += device/generic/goldfish-opengl # for goldfish deps.
+
+ifdef NET_ETH0_STARTONBOOT
+  PRODUCT_PROPERTY_OVERRIDES += net.eth0.startonboot=1
+endif
+
+# Ensure we package the BIOS files too.
+PRODUCT_HOST_PACKAGES += \
+	bios.bin \
+	vgabios-cirrus.bin \
diff --git a/target/board/emulator_x86_64/system_ext.prop b/target/board/emulator_x86_64/system_ext.prop
new file mode 100644
index 0000000..ed9d173
--- /dev/null
+++ b/target/board/emulator_x86_64/system_ext.prop
@@ -0,0 +1,5 @@
+#
+# system.prop for generic sdk
+#
+
+rild.libpath=/vendor/lib64/libreference-ril.so
diff --git a/target/board/emulator_x86_64_arm64/BoardConfig.mk b/target/board/emulator_x86_64_arm64/BoardConfig.mk
new file mode 100755
index 0000000..26b61a6
--- /dev/null
+++ b/target/board/emulator_x86_64_arm64/BoardConfig.mk
@@ -0,0 +1,59 @@
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# x86_64 emulator specific definitions
+TARGET_CPU_ABI := x86_64
+TARGET_ARCH := x86_64
+TARGET_ARCH_VARIANT := x86_64
+
+TARGET_2ND_CPU_ABI := x86
+TARGET_2ND_ARCH := x86
+TARGET_2ND_ARCH_VARIANT := x86_64
+
+TARGET_NATIVE_BRIDGE_ARCH := arm64
+TARGET_NATIVE_BRIDGE_ARCH_VARIANT := armv8-a
+TARGET_NATIVE_BRIDGE_CPU_VARIANT := generic
+TARGET_NATIVE_BRIDGE_ABI := arm64-v8a
+
+TARGET_NATIVE_BRIDGE_2ND_ARCH := arm
+TARGET_NATIVE_BRIDGE_2ND_ARCH_VARIANT := armv7-a-neon
+TARGET_NATIVE_BRIDGE_2ND_CPU_VARIANT := generic
+TARGET_NATIVE_BRIDGE_2ND_ABI := armeabi-v7a armeabi
+
+BUILD_BROKEN_DUP_RULES := true
+
+TARGET_PRELINK_MODULE := false
+
+include build/make/target/board/BoardConfigMainlineCommon.mk
+include build/make/target/board/BoardConfigEmuCommon.mk
+
+# the settings differ from BoardConfigMainlineCommon.mk
+BOARD_USES_SYSTEM_OTHER_ODEX :=
+
+# Resize to 4G to accommodate ASAN and CTS
+BOARD_USERDATAIMAGE_PARTITION_SIZE := 4294967296
+
+BOARD_SEPOLICY_DIRS += device/generic/goldfish/sepolicy/x86
+
+# Wifi.
+BOARD_WLAN_DEVICE           := emulator
+BOARD_HOSTAPD_DRIVER        := NL80211
+BOARD_WPA_SUPPLICANT_DRIVER := NL80211
+BOARD_HOSTAPD_PRIVATE_LIB   := lib_driver_cmd_simulated
+BOARD_WPA_SUPPLICANT_PRIVATE_LIB := lib_driver_cmd_simulated
+WPA_SUPPLICANT_VERSION      := VER_0_8_X
+WIFI_DRIVER_FW_PATH_PARAM   := "/dev/null"
+WIFI_DRIVER_FW_PATH_STA     := "/dev/null"
+WIFI_DRIVER_FW_PATH_AP      := "/dev/null"
diff --git a/target/board/emulator_x86_64_arm64/device.mk b/target/board/emulator_x86_64_arm64/device.mk
new file mode 100755
index 0000000..af023eb
--- /dev/null
+++ b/target/board/emulator_x86_64_arm64/device.mk
@@ -0,0 +1,18 @@
+#
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+PRODUCT_SOONG_NAMESPACES += device/generic/goldfish # for libwifi-hal-emu
+PRODUCT_SOONG_NAMESPACES += device/generic/goldfish-opengl # for goldfish deps.
diff --git a/target/board/emulator_x86_64_arm64/system_ext.prop b/target/board/emulator_x86_64_arm64/system_ext.prop
new file mode 100644
index 0000000..ed9d173
--- /dev/null
+++ b/target/board/emulator_x86_64_arm64/system_ext.prop
@@ -0,0 +1,5 @@
+#
+# system.prop for generic sdk
+#
+
+rild.libpath=/vendor/lib64/libreference-ril.so
diff --git a/target/board/emulator_x86_arm/BoardConfig.mk b/target/board/emulator_x86_arm/BoardConfig.mk
new file mode 100644
index 0000000..21fdbc8
--- /dev/null
+++ b/target/board/emulator_x86_arm/BoardConfig.mk
@@ -0,0 +1,52 @@
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# x86 emulator specific definitions
+TARGET_CPU_ABI := x86
+TARGET_ARCH := x86
+TARGET_ARCH_VARIANT := x86
+
+TARGET_NATIVE_BRIDGE_ARCH := arm
+TARGET_NATIVE_BRIDGE_ARCH_VARIANT := armv7-a-neon
+TARGET_NATIVE_BRIDGE_CPU_VARIANT := generic
+TARGET_NATIVE_BRIDGE_ABI := armeabi-v7a armeabi
+
+BUILD_BROKEN_DUP_RULES := true
+
+#
+# The inclusion order below is important.
+# The settings in latter makefiles overwrite those in the former.
+#
+include build/make/target/board/BoardConfigMainlineCommon.mk
+include build/make/target/board/BoardConfigEmuCommon.mk
+
+# the settings differ from BoardConfigMainlineCommon.mk
+BOARD_USES_SYSTEM_OTHER_ODEX :=
+
+# Resize to 4G to accommodate ASAN and CTS
+BOARD_USERDATAIMAGE_PARTITION_SIZE := 4294967296
+
+BOARD_SEPOLICY_DIRS += device/generic/goldfish/sepolicy/x86
+
+# Wifi.
+BOARD_WLAN_DEVICE           := emulator
+BOARD_HOSTAPD_DRIVER        := NL80211
+BOARD_WPA_SUPPLICANT_DRIVER := NL80211
+BOARD_HOSTAPD_PRIVATE_LIB   := lib_driver_cmd_simulated
+BOARD_WPA_SUPPLICANT_PRIVATE_LIB := lib_driver_cmd_simulated
+WPA_SUPPLICANT_VERSION      := VER_0_8_X
+WIFI_DRIVER_FW_PATH_PARAM   := "/dev/null"
+WIFI_DRIVER_FW_PATH_STA     := "/dev/null"
+WIFI_DRIVER_FW_PATH_AP      := "/dev/null"
diff --git a/target/board/emulator_x86_arm/device.mk b/target/board/emulator_x86_arm/device.mk
new file mode 100644
index 0000000..af023eb
--- /dev/null
+++ b/target/board/emulator_x86_arm/device.mk
@@ -0,0 +1,18 @@
+#
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+PRODUCT_SOONG_NAMESPACES += device/generic/goldfish # for libwifi-hal-emu
+PRODUCT_SOONG_NAMESPACES += device/generic/goldfish-opengl # for goldfish deps.
diff --git a/target/board/emulator_x86_arm/system_ext.prop b/target/board/emulator_x86_arm/system_ext.prop
new file mode 100644
index 0000000..64829f3
--- /dev/null
+++ b/target/board/emulator_x86_arm/system_ext.prop
@@ -0,0 +1,5 @@
+#
+# system.prop for generic sdk
+#
+
+rild.libpath=/vendor/lib/libreference-ril.so
diff --git a/target/product/mainline_system.mk b/target/product/mainline_system.mk
index a8b75e0..bed1b28 100644
--- a/target/product/mainline_system.mk
+++ b/target/product/mainline_system.mk
@@ -104,10 +104,11 @@
 PRODUCT_PACKAGES_DEBUG += \
     avbctl \
     bootctl \
-    tinyplay \
     tinycap \
+    tinyhostless \
     tinymix \
     tinypcminfo \
+    tinyplay \
     update_engine_client \
 
 PRODUCT_HOST_PACKAGES += \
diff --git a/target/product/sdk_phone_arm64.mk b/target/product/sdk_phone_arm64.mk
index 3ab0c57..cefa288 100644
--- a/target/product/sdk_phone_arm64.mk
+++ b/target/product/sdk_phone_arm64.mk
@@ -14,7 +14,6 @@
 # limitations under the License.
 #
 QEMU_USE_SYSTEM_EXT_PARTITIONS := true
-
 PRODUCT_USE_DYNAMIC_PARTITIONS := true
 
 # This is a build configuration for a full-featured build of the
@@ -22,6 +21,11 @@
 # build quite specifically for the emulator, and might not be
 # entirely appropriate to inherit from for on-device configurations.
 
+# Enable mainline checking for exact this product name
+ifeq (sdk_phone_arm64,$(TARGET_PRODUCT))
+PRODUCT_ENFORCE_ARTIFACT_PATH_REQUIREMENTS := relaxed
+endif
+
 #
 # All components inherited here go to system image
 #
diff --git a/target/product/sdk_phone_armv7.mk b/target/product/sdk_phone_armv7.mk
index 77b8b50..c4c5a38 100644
--- a/target/product/sdk_phone_armv7.mk
+++ b/target/product/sdk_phone_armv7.mk
@@ -14,8 +14,40 @@
 # limitations under the License.
 #
 QEMU_USE_SYSTEM_EXT_PARTITIONS := true
+PRODUCT_USE_DYNAMIC_PARTITIONS := true
 
-$(call inherit-product, $(SRC_TARGET_DIR)/product/aosp_arm.mk)
+# This is a build configuration for a full-featured build of the
+# Open-Source part of the tree. It's geared toward a US-centric
+# build quite specifically for the emulator, and might not be
+# entirely appropriate to inherit from for on-device configurations.
+
+# Enable mainline checking for exact this product name
+ifeq (sdk_phone_armv7,$(TARGET_PRODUCT))
+PRODUCT_ENFORCE_ARTIFACT_PATH_REQUIREMENTS := relaxed
+endif
+
+#
+# All components inherited here go to system image
+#
+$(call inherit-product, $(SRC_TARGET_DIR)/product/mainline_system.mk)
+
+#
+# All components inherited here go to system_ext image
+#
+$(call inherit-product, $(SRC_TARGET_DIR)/product/handheld_system_ext.mk)
+$(call inherit-product, $(SRC_TARGET_DIR)/product/telephony_system_ext.mk)
+
+#
+# All components inherited here go to product image
+#
+$(call inherit-product, $(SRC_TARGET_DIR)/product/aosp_product.mk)
+
+#
+# All components inherited here go to vendor image
+#
+$(call inherit-product-if-exists, device/generic/goldfish/arm32-vendor.mk)
+$(call inherit-product, $(SRC_TARGET_DIR)/product/emulator_vendor.mk)
+$(call inherit-product, $(SRC_TARGET_DIR)/board/emulator_arm/device.mk)
 
 # Define the host tools and libs that are parts of the SDK.
 $(call inherit-product, sdk/build/product_sdk.mk)
@@ -29,4 +61,5 @@
 # Overrides
 PRODUCT_BRAND := Android
 PRODUCT_NAME := sdk_phone_armv7
-PRODUCT_DEVICE := generic
+PRODUCT_DEVICE := emulator_arm
+PRODUCT_MODEL := Android SDK built for arm
diff --git a/target/product/sdk_phone_x86.mk b/target/product/sdk_phone_x86.mk
index e8c60b4..bcee066 100644
--- a/target/product/sdk_phone_x86.mk
+++ b/target/product/sdk_phone_x86.mk
@@ -16,12 +16,17 @@
 QEMU_USE_SYSTEM_EXT_PARTITIONS := true
 PRODUCT_USE_DYNAMIC_PARTITIONS := true
 
+# This is a build configuration for a full-featured build of the
+# Open-Source part of the tree. It's geared toward a US-centric
+# build quite specifically for the emulator, and might not be
+# entirely appropriate to inherit from for on-device configurations.
+
 #
 # All components inherited here go to system image
 #
 $(call inherit-product, $(SRC_TARGET_DIR)/product/mainline_system.mk)
 
-# Enable mainline checking for excat this product name
+# Enable mainline checking for exact this product name
 ifeq (sdk_phone_x86,$(TARGET_PRODUCT))
 PRODUCT_ENFORCE_ARTIFACT_PATH_REQUIREMENTS := relaxed
 endif
@@ -42,7 +47,7 @@
 #
 $(call inherit-product-if-exists, device/generic/goldfish/x86-vendor.mk)
 $(call inherit-product, $(SRC_TARGET_DIR)/product/emulator_vendor.mk)
-$(call inherit-product, $(SRC_TARGET_DIR)/board/generic_x86/device.mk)
+$(call inherit-product, $(SRC_TARGET_DIR)/board/emulator_x86/device.mk)
 
 # Define the host tools and libs that are parts of the SDK.
 -include sdk/build/product_sdk.mk
@@ -51,5 +56,5 @@
 # Overrides
 PRODUCT_BRAND := Android
 PRODUCT_NAME := sdk_phone_x86
-PRODUCT_DEVICE := generic_x86
+PRODUCT_DEVICE := emulator_x86
 PRODUCT_MODEL := Android SDK built for x86
diff --git a/target/product/sdk_phone_x86_64.mk b/target/product/sdk_phone_x86_64.mk
index 862c66e..82bbee5 100644
--- a/target/product/sdk_phone_x86_64.mk
+++ b/target/product/sdk_phone_x86_64.mk
@@ -16,13 +16,18 @@
 QEMU_USE_SYSTEM_EXT_PARTITIONS := true
 PRODUCT_USE_DYNAMIC_PARTITIONS := true
 
+# This is a build configuration for a full-featured build of the
+# Open-Source part of the tree. It's geared toward a US-centric
+# build quite specifically for the emulator, and might not be
+# entirely appropriate to inherit from for on-device configurations.
+
 #
 # All components inherited here go to system image
 #
 $(call inherit-product, $(SRC_TARGET_DIR)/product/core_64_bit.mk)
 $(call inherit-product, $(SRC_TARGET_DIR)/product/mainline_system.mk)
 
-# Enable mainline checking for excat this product name
+# Enable mainline checking for exact this product name
 ifeq (sdk_phone_x86_64,$(TARGET_PRODUCT))
 PRODUCT_ENFORCE_ARTIFACT_PATH_REQUIREMENTS := relaxed
 endif
@@ -43,7 +48,7 @@
 #
 $(call inherit-product-if-exists, device/generic/goldfish/x86_64-vendor.mk)
 $(call inherit-product, $(SRC_TARGET_DIR)/product/emulator_vendor.mk)
-$(call inherit-product, $(SRC_TARGET_DIR)/board/generic_x86_64/device.mk)
+$(call inherit-product, $(SRC_TARGET_DIR)/board/emulator_x86_64/device.mk)
 
 # Define the host tools and libs that are parts of the SDK.
 -include sdk/build/product_sdk.mk
@@ -52,5 +57,5 @@
 # Overrides
 PRODUCT_BRAND := Android
 PRODUCT_NAME := sdk_phone_x86_64
-PRODUCT_DEVICE := generic_x86_64
+PRODUCT_DEVICE := emulator_x86_64
 PRODUCT_MODEL := Android SDK built for x86_64
diff --git a/tools/Android.bp b/tools/Android.bp
index 8c7eb38..159890c 100644
--- a/tools/Android.bp
+++ b/tools/Android.bp
@@ -24,3 +24,16 @@
     },
   },
 }
+
+python_binary_host {
+  name: "post_process_props",
+  srcs: ["post_process_props.py"],
+  version: {
+    py2: {
+      enabled: false,
+    },
+    py3: {
+      enabled: true,
+    },
+  },
+}
diff --git a/tools/post_process_props.py b/tools/post_process_props.py
index 9ddd5d7..b221041 100755
--- a/tools/post_process_props.py
+++ b/tools/post_process_props.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright (C) 2009 The Android Open Source Project
 #
@@ -24,121 +24,114 @@
 # so we decrease the value by 1 here.
 PROP_VALUE_MAX = 91
 
-# Put the modifications that you need to make into the /system/build.prop into this
-# function. The prop object has get(name) and put(name,value) methods.
-def mangle_build_prop(prop):
-  pass
-
-# Put the modifications that you need to make into /vendor/default.prop and
-# /odm/default.prop into this function. The prop object has get(name) and
-# put(name,value) methods.
-def mangle_default_prop_override(prop):
-  pass
-
-# Put the modifications that you need to make into the /system/etc/prop.default into this
-# function. The prop object has get(name) and put(name,value) methods.
-def mangle_default_prop(prop):
+# Put the modifications that you need to make into the */build.prop into this
+# function.
+def mangle_build_prop(prop_list):
   # If ro.debuggable is 1, then enable adb on USB by default
   # (this is for userdebug builds)
-  if prop.get("ro.debuggable") == "1":
-    val = prop.get("persist.sys.usb.config")
+  if prop_list.get("ro.debuggable") == "1":
+    val = prop_list.get("persist.sys.usb.config")
     if "adb" not in val:
       if val == "":
         val = "adb"
       else:
         val = val + ",adb"
-      prop.put("persist.sys.usb.config", val)
+      prop_list.put("persist.sys.usb.config", val)
   # UsbDeviceManager expects a value here.  If it doesn't get it, it will
   # default to "adb". That might not the right policy there, but it's better
   # to be explicit.
-  if not prop.get("persist.sys.usb.config"):
-    prop.put("persist.sys.usb.config", "none");
+  if not prop_list.get("persist.sys.usb.config"):
+    prop_list.put("persist.sys.usb.config", "none");
 
-def validate(prop):
+def validate(prop_list):
   """Validate the properties.
 
   Returns:
     True if nothing is wrong.
   """
   check_pass = True
-  buildprops = prop.to_dict()
-  for key, value in buildprops.iteritems():
-    # Check build properties' length.
-    if len(value) > PROP_VALUE_MAX and not key.startswith("ro."):
+  for p in prop_list.get_all():
+    if len(p.value) > PROP_VALUE_MAX and not p.name.startswith("ro."):
       check_pass = False
       sys.stderr.write("error: %s cannot exceed %d bytes: " %
-                       (key, PROP_VALUE_MAX))
-      sys.stderr.write("%s (%d)\n" % (value, len(value)))
+                       (p.name, PROP_VALUE_MAX))
+      sys.stderr.write("%s (%d)\n" % (p.value, len(p.value)))
   return check_pass
 
-class PropFile:
+class Prop:
 
-  def __init__(self, lines):
-    self.lines = [s.strip() for s in lines]
+  def __init__(self, name, value, comment=None):
+    self.name = name.strip()
+    self.value = value.strip()
+    self.comment = comment
 
-  def to_dict(self):
-    props = {}
-    for line in self.lines:
-      if not line or line.startswith("#"):
-        continue
-      if "=" in line:
-        key, value = line.split("=", 1)
-        props[key] = value
-    return props
+  @staticmethod
+  def from_line(line):
+    line = line.rstrip('\n')
+    if line.startswith("#"):
+      return Prop("", "", line)
+    elif "=" in line:
+      name, value = line.split("=", 1)
+      return Prop(name, value)
+    else:
+      # don't fail on invalid line
+      # TODO(jiyong) make this a hard error
+      return Prop("", "", line)
+
+  def is_comment(self):
+    return self.comment != None
+
+  def __str__(self):
+    if self.is_comment():
+      return self.comment
+    else:
+      return self.name + "=" + self.value
+
+class PropList:
+
+  def __init__(self, filename):
+    with open(filename) as f:
+      self.props = [Prop.from_line(l)
+                    for l in f.readlines() if l.strip() != ""]
+
+  def get_all(self):
+    return [p for p in self.props if not p.is_comment()]
 
   def get(self, name):
-    key = name + "="
-    for line in self.lines:
-      if line.startswith(key):
-        return line[len(key):]
-    return ""
+    return next((p.value for p in self.props if p.name == name), "")
 
   def put(self, name, value):
-    key = name + "="
-    for i in range(0,len(self.lines)):
-      if self.lines[i].startswith(key):
-        self.lines[i] = key + value
-        return
-    self.lines.append(key + value)
+    index = next((i for i,p in enumerate(self.props) if p.name == name), -1)
+    if index == -1:
+      self.props.append(Prop(name, value))
+    else:
+      self.props[index].value = value
 
   def delete(self, name):
-    key = name + "="
-    self.lines = [ line for line in self.lines if not line.startswith(key) ]
+    self.props = [p for p in self.props if p.name != name]
 
-  def write(self, f):
-    f.write("\n".join(self.lines))
-    f.write("\n")
+  def write(self, filename):
+    with open(filename, 'w+') as f:
+      for p in self.props:
+        f.write(str(p) + "\n")
 
 def main(argv):
   filename = argv[1]
-  f = open(filename)
-  lines = f.readlines()
-  f.close()
 
-  properties = PropFile(lines)
-
-  if filename.endswith("/build.prop"):
-    mangle_build_prop(properties)
-  elif (filename.endswith("/vendor/default.prop") or
-        filename.endswith("/odm/default.prop")):
-    mangle_default_prop_override(properties)
-  elif (filename.endswith("/default.prop") or # legacy
-        filename.endswith("/prop.default")):
-    mangle_default_prop(properties)
-  else:
+  if not filename.endswith("/build.prop"):
     sys.stderr.write("bad command line: " + str(argv) + "\n")
     sys.exit(1)
 
-  if not validate(properties):
+  props = PropList(filename)
+  mangle_build_prop(props)
+  if not validate(props):
     sys.exit(1)
 
   # Drop any blacklisted keys
   for key in argv[2:]:
-    properties.delete(key)
+    props.delete(key)
 
-  f = open(filename, 'w+')
-  properties.write(f)
-  f.close()
+  props.write(filename)
 
 if __name__ == "__main__":
   main(sys.argv)
diff --git a/tools/releasetools/Android.bp b/tools/releasetools/Android.bp
index d6f2116..b52da87 100644
--- a/tools/releasetools/Android.bp
+++ b/tools/releasetools/Android.bp
@@ -73,9 +73,6 @@
         "releasetools_build_super_image",
         "releasetools_common",
     ],
-    required: [
-        "zip2zip",
-    ],
 }
 
 python_defaults {
@@ -468,9 +465,6 @@
     data: [
         "testdata/**/*",
     ],
-    required: [
-        "otatools",
-    ],
 }
 
 python_test_host {