diff --git a/core/Makefile b/core/Makefile
index 5cb8766..533943a 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -104,6 +104,9 @@
 # prop.default
 ifdef property_overrides_split_enabled
 INSTALLED_DEFAULT_PROP_TARGET := $(TARGET_OUT)/etc/prop.default
+INSTALLED_DEFAULT_PROP_OLD_TARGET := $(TARGET_ROOT_OUT)/default.prop
+ALL_DEFAULT_INSTALLED_MODULES += $(INSTALLED_DEFAULT_PROP_OLD_TARGET)
+$(INSTALLED_DEFAULT_PROP_OLD_TARGET): $(INSTALLED_DEFAULT_PROP_TARGET)
 else
 # legacy path
 INSTALLED_DEFAULT_PROP_TARGET := $(TARGET_ROOT_OUT)/default.prop
@@ -139,7 +142,7 @@
 	$(hide) build/tools/post_process_props.py $@
 ifdef property_overrides_split_enabled
 	$(hide) mkdir -p $(TARGET_ROOT_OUT)
-	$(hide) ln -sf system/etc/prop.default $(TARGET_ROOT_OUT)/default.prop
+	$(hide) ln -sf system/etc/prop.default $(INSTALLED_DEFAULT_PROP_OLD_TARGET)
 endif
 
 # -----------------------------------------------------------------
@@ -445,8 +448,10 @@
 # -----------------------------------------------------------------
 # Cert-to-package mapping.  Used by the post-build signing tools.
 # Use a macro to add newline to each echo command
-define _apkcerts_echo_with_newline
-$(hide) echo $(1)
+define _apkcerts_write_line
+$(hide) echo -n 'name="$(1).apk" certificate="$2" private_key="$3"' >> $5
+$(if $(4), $(hide) echo -n ' compressed="$4"' >> $5)
+$(hide) echo '' >> $5
 
 endef
 
@@ -466,12 +471,8 @@
 	@rm -f $@
 	$(foreach p,$(PACKAGES),\
 	  $(if $(PACKAGES.$(p).EXTERNAL_KEY),\
-	    $(call _apkcerts_echo_with_newline,\
-	      'name="$(p).apk" certificate="EXTERNAL" \
-	      private_key=""' >> $@),\
-	    $(call _apkcerts_echo_with_newline,\
-	      'name="$(p).apk" certificate="$(PACKAGES.$(p).CERTIFICATE)" \
-	      private_key="$(PACKAGES.$(p).PRIVATE_KEY)"' >> $@)))
+	    $(call _apkcerts_write_line,$(p),"EXTERNAL","",$(PACKAGES.$(p).COMPRESSED),$@),\
+	    $(call _apkcerts_write_line,$(p),$(PACKAGES.$(p).CERTIFICATE),$(PACKAGES.$(p).PRIVATE_KEY),$(PACKAGES.$(p).COMPRESSED),$@)))
 	# In case value of PACKAGES is empty.
 	$(hide) touch $@
 
@@ -2048,6 +2049,14 @@
 vbmetaimage-nodeps:
 	$(build-vbmetaimage-target)
 
+else ifeq (true,$(BOARD_BUILD_DISABLED_VBMETAIMAGE))
+BUILT_DISABLED_VBMETAIMAGE := $(PRODUCT_OUT)/vbmeta.img
+
+INSTALLED_VBMETAIMAGE_TARGET := $(BUILT_DISABLED_VBMETAIMAGE)
+$(INSTALLED_VBMETAIMAGE_TARGET): $(AVBTOOL)
+	$(hide) $(AVBTOOL) make_vbmeta_image \
+	  --flag 2 --padding_size 4096 --output $@
+
 endif # BOARD_AVB_ENABLE
 
 # -----------------------------------------------------------------
@@ -2292,6 +2301,7 @@
 		$(INSTALLED_USERDATAIMAGE_TARGET) \
 		$(INSTALLED_CACHEIMAGE_TARGET) \
 		$(INSTALLED_VENDORIMAGE_TARGET) \
+		$(INSTALLED_VBMETAIMAGE_TARGET) \
 		$(INSTALLED_DTBOIMAGE_TARGET) \
 		$(INTERNAL_SYSTEMOTHERIMAGE_FILES) \
 		$(INSTALLED_ANDROID_INFO_TXT_TARGET) \
@@ -2512,6 +2522,14 @@
 	@# If breakpad symbols have been generated, add them to the zip.
 	$(hide) $(ACP) -r $(TARGET_OUT_BREAKPAD) $(zip_root)/BREAKPAD
 endif
+# BOARD_BUILD_DISABLED_VBMETAIMAGE is used to build a special vbmeta.img
+# that disables AVB verification. The content is fixed and we can just copy
+# it to $(zip_root)/IMAGES without passing some info into misc_info.txt for
+# regeneration.
+ifeq (true,$(BOARD_BUILD_DISABLED_VBMETAIMAGE))
+	$(hide) mkdir -p $(zip_root)/IMAGES
+	$(hide) cp $(INSTALLED_VBMETAIMAGE_TARGET) $(zip_root)/IMAGES/
+endif
 ifdef BOARD_PREBUILT_VENDORIMAGE
 	$(hide) mkdir -p $(zip_root)/IMAGES
 	$(hide) cp $(INSTALLED_VENDORIMAGE_TARGET) $(zip_root)/IMAGES/
diff --git a/core/android_manifest.mk b/core/android_manifest.mk
index 0093e02..7d573d3 100644
--- a/core/android_manifest.mk
+++ b/core/android_manifest.mk
@@ -34,10 +34,12 @@
 main_android_manifest := $(full_android_manifest)
 full_android_manifest := $(intermediates.COMMON)/AndroidManifest.xml
 $(full_android_manifest): PRIVATE_LIBS_MANIFESTS := $(my_full_libs_manifest_files)
+$(full_android_manifest): $(ANDROID_MANIFEST_MERGER_CLASSPATH)
 $(full_android_manifest) : $(main_android_manifest) $(my_full_libs_manifest_deps)
 	@echo "Merge android manifest files: $@ <-- $< $(PRIVATE_LIBS_MANIFESTS)"
 	@mkdir -p $(dir $@)
-	$(hide) $(ANDROID_MANIFEST_MERGER) --main $< --libs $(PRIVATE_LIBS_MANIFESTS) \
+	$(hide) $(ANDROID_MANIFEST_MERGER) --main $< \
+	    --libs $(call normalize-path-list,$(PRIVATE_LIBS_MANIFESTS)) \
 	    --out $@
 
 endif
diff --git a/core/build_id.mk b/core/build_id.mk
index 00272aa..ff4d013 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -18,4 +18,4 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-export BUILD_ID=OC-DR1
+export BUILD_ID=OC-MR1
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 1e64c4f..dc3c5f2 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -34,6 +34,7 @@
 LOCAL_CLASSPATH:=
 LOCAL_COMPATIBILITY_SUITE:=
 LOCAL_COMPATIBILITY_SUPPORT_FILES:=
+LOCAL_COMPRESSED_MODULE:=
 LOCAL_CONLYFLAGS:=
 LOCAL_COPY_HEADERS:=
 LOCAL_COPY_HEADERS_TO:=
diff --git a/core/config.mk b/core/config.mk
index 86fc399..bd15dce 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -661,7 +661,14 @@
 JACOCO_CLI_JAR := $(HOST_OUT_JAVA_LIBRARIES)/jacoco-cli$(COMMON_JAVA_PACKAGE_SUFFIX)
 
 # Tool to merge AndroidManifest.xmls
-ANDROID_MANIFEST_MERGER := $(JAVA) -classpath prebuilts/devtools/tools/lib/manifest-merger.jar com.android.manifmerger.Main merge
+ANDROID_MANIFEST_MERGER_CLASSPATH := \
+    prebuilts/gradle-plugin/com/android/tools/build/manifest-merger/26.0.0-beta2/manifest-merger-26.0.0-beta2.jar \
+    prebuilts/gradle-plugin/com/android/tools/sdk-common/26.0.0-beta2/sdk-common-26.0.0-beta2.jar \
+    prebuilts/gradle-plugin/com/android/tools/common/26.0.0-beta2/common-26.0.0-beta2.jar \
+    prebuilts/misc/common/guava/guava-21.0.jar
+ANDROID_MANIFEST_MERGER := $(JAVA) \
+    -classpath $(subst $(space),:,$(strip $(ANDROID_MANIFEST_MERGER_CLASSPATH))) \
+    com.android.manifmerger.Merger
 
 COLUMN:= column
 
@@ -700,6 +707,14 @@
   PRODUCT_FULL_TREBLE := true
 endif
 
+ifdef PRODUCT_SHIPPING_API_LEVEL
+  ifneq ($(call math_gt_or_eq,$(PRODUCT_SHIPPING_API_LEVEL),27),)
+    ifneq ($(TARGET_USES_MKE2FS),true)
+      $(error When PRODUCT_SHIPPING_API_LEVEL >= 27, TARGET_USES_MKE2FS must be true)
+    endif
+  endif
+endif
+
 # The default key if not set as LOCAL_CERTIFICATE
 ifdef PRODUCT_DEFAULT_DEV_CERTIFICATE
   DEFAULT_SYSTEM_DEV_CERTIFICATE := $(PRODUCT_DEFAULT_DEV_CERTIFICATE)
@@ -735,8 +750,14 @@
 
 ifeq ($(strip $(PRODUCT_COMPATIBILITY_MATRIX_LEVEL)),legacy)
   FRAMEWORK_COMPATIBILITY_MATRIX_FILE := hardware/interfaces/compatibility_matrix.legacy.xml
-else ifeq ($(call math_gt_or_eq,$(PRODUCT_COMPATIBILITY_MATRIX_LEVEL),27),)
+else ifeq ($(call math_gt_or_eq,$(PRODUCT_COMPATIBILITY_MATRIX_LEVEL),26),)
+  # All PRODUCT_FULL_TREBLE devices with shipping API levels < 26 get the level 26 manifest
+  # as that is the first.
   FRAMEWORK_COMPATIBILITY_MATRIX_FILE := hardware/interfaces/compatibility_matrix.26.xml
+else ifeq ($(call math_gt_or_eq,$(PRODUCT_COMPATIBILITY_MATRIX_LEVEL),28),)
+  # All shipping API levels with released compatibility matrices get the corresponding matrix.
+  FRAMEWORK_COMPATIBILITY_MATRIX_FILE := \
+      hardware/interfaces/compatibility_matrix.$(PRODUCT_COMPATIBILITY_MATRIX_LEVEL).xml
 else
   FRAMEWORK_COMPATIBILITY_MATRIX_FILE := hardware/interfaces/compatibility_matrix.current.xml
 endif
diff --git a/core/definitions.mk b/core/definitions.mk
index c7799b0..9ddbd17 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -2558,6 +2558,15 @@
   fi
 endef
 
+# Compress a package using the standard gzip algorithm.
+define compress-package
+$(hide) \
+  mv $@ $@.uncompressed; \
+  $(MINIGZIP) -c $@.uncompressed > $@.compressed; \
+  rm -f $@.uncompressed; \
+  mv $@.compressed $@;
+endef
+
 # Remove dynamic timestamps from packages
 #
 define remove-timestamps-from-package
diff --git a/core/dex_preopt_odex_install.mk b/core/dex_preopt_odex_install.mk
index f420b18..93824c3 100644
--- a/core/dex_preopt_odex_install.mk
+++ b/core/dex_preopt_odex_install.mk
@@ -65,17 +65,10 @@
 built_installed_vdex :=
 built_installed_art :=
 
-ifdef LOCAL_DEX_PREOPT
-
 ifeq (false,$(WITH_DEX_PREOPT_GENERATE_PROFILE))
 LOCAL_DEX_PREOPT_GENERATE_PROFILE := false
 endif
 
-ifdef LOCAL_VENDOR_MODULE
-ifeq (true,$(LOCAL_DEX_PREOPT_GENERATE_PROFILE))
-$(error profiles are not supported for vendor modules)
-endif
-else
 ifndef LOCAL_DEX_PREOPT_GENERATE_PROFILE
 # If LOCAL_DEX_PREOPT_GENERATE_PROFILE is not defined, default it based on the existence of the
 # profile class listing. TODO: Use product specific directory here.
@@ -83,14 +76,54 @@
 LOCAL_DEX_PREOPT_PROFILE_CLASS_LISTING := $(my_classes_directory)/$(LOCAL_MODULE).prof.txt
 ifneq (,$(wildcard $(LOCAL_DEX_PREOPT_PROFILE_CLASS_LISTING)))
 # Profile listing exists, use it to generate the profile.
-ifeq ($(LOCAL_DEX_PREOPT_APP_IMAGE),)
-LOCAL_DEX_PREOPT_APP_IMAGE := true
-endif
 LOCAL_DEX_PREOPT_GENERATE_PROFILE := true
 endif
 endif
+
+ifeq (true,$(LOCAL_DEX_PREOPT_GENERATE_PROFILE))
+
+ifdef LOCAL_VENDOR_MODULE
+$(call pretty-error, Internal error: profiles are not supported for vendor modules)
+else
+LOCAL_DEX_PREOPT_APP_IMAGE := true
 endif
 
+ifndef LOCAL_DEX_PREOPT_PROFILE_CLASS_LISTING
+$(call pretty-error,Must have specified class listing (LOCAL_DEX_PREOPT_PROFILE_CLASS_LISTING))
+endif
+ifeq (,$(dex_preopt_profile_src_file))
+$(call pretty-error, Internal error: dex_preopt_profile_src_file must be set)
+endif
+my_built_profile := $(dir $(LOCAL_BUILT_MODULE))/profile.prof
+my_dex_location := $(patsubst $(PRODUCT_OUT)%,%,$(LOCAL_INSTALLED_MODULE))
+# Remove compressed APK extension.
+my_dex_location := $(patsubst %.gz,%,$(my_dex_location))
+$(my_built_profile): PRIVATE_BUILT_MODULE := $(dex_preopt_profile_src_file)
+$(my_built_profile): PRIVATE_DEX_LOCATION := $(my_dex_location)
+$(my_built_profile): PRIVATE_SOURCE_CLASSES := $(LOCAL_DEX_PREOPT_PROFILE_CLASS_LISTING)
+$(my_built_profile): $(LOCAL_DEX_PREOPT_PROFILE_CLASS_LISTING)
+$(my_built_profile): $(PROFMAN)
+$(my_built_profile): $(dex_preopt_profile_src_file)
+$(my_built_profile):
+	$(hide) mkdir -p $(dir $@)
+	ANDROID_LOG_TAGS="*:e" $(PROFMAN) \
+		--create-profile-from=$(PRIVATE_SOURCE_CLASSES) \
+		--apk=$(PRIVATE_BUILT_MODULE) \
+		--dex-location=$(PRIVATE_DEX_LOCATION) \
+		--reference-profile-file=$@
+dex_preopt_profile_src_file:=
+# Remove compressed APK  extension.
+my_installed_profile := $(patsubst %.gz,%,$(LOCAL_INSTALLED_MODULE)).prof
+# my_installed_profile := $(LOCAL_INSTALLED_MODULE).prof
+$(eval $(call copy-one-file,$(my_built_profile),$(my_installed_profile)))
+build_installed_profile:=$(my_built_profile):$(my_installed_profile)
+else
+build_installed_profile:=
+my_installed_profile :=
+endif
+
+ifdef LOCAL_DEX_PREOPT
+
 dexpreopt_boot_jar_module := $(filter $(DEXPREOPT_BOOT_JARS_MODULES),$(LOCAL_MODULE))
 ifdef dexpreopt_boot_jar_module
 # For libart, the boot jars' odex files are replaced by $(DEFAULT_DEX_PREOPT_INSTALLED_IMAGE).
@@ -146,32 +179,9 @@
 
 ifdef built_odex
 ifeq (true,$(LOCAL_DEX_PREOPT_GENERATE_PROFILE))
-ifndef LOCAL_DEX_PREOPT_PROFILE_CLASS_LISTING
-$(call pretty-error,Must have specified class listing (LOCAL_DEX_PREOPT_PROFILE_CLASS_LISTING))
-endif
-my_built_profile := $(dir $(LOCAL_BUILT_MODULE))/profile.prof
-my_dex_location := $(patsubst $(PRODUCT_OUT)%,%,$(LOCAL_INSTALLED_MODULE))
 $(built_odex): $(my_built_profile)
 $(built_odex): PRIVATE_PROFILE_PREOPT_FLAGS := --profile-file=$(my_built_profile)
-$(my_built_profile): PRIVATE_BUILT_MODULE := $(LOCAL_BUILT_MODULE)
-$(my_built_profile): PRIVATE_DEX_LOCATION := $(my_dex_location)
-$(my_built_profile): PRIVATE_SOURCE_CLASSES := $(LOCAL_DEX_PREOPT_PROFILE_CLASS_LISTING)
-$(my_built_profile): $(LOCAL_DEX_PREOPT_PROFILE_CLASS_LISTING)
-$(my_built_profile): $(PROFMAN)
-$(my_built_profile): $(LOCAL_BUILT_MODULE)
-$(my_built_profile):
-	$(hide) mkdir -p $(dir $@)
-	ANDROID_LOG_TAGS="*:e" $(PROFMAN) \
-		--create-profile-from=$(PRIVATE_SOURCE_CLASSES) \
-		--apk=$(PRIVATE_BUILT_MODULE) \
-		--dex-location=$(PRIVATE_DEX_LOCATION) \
-		--reference-profile-file=$@
-my_installed_profile := $(LOCAL_INSTALLED_MODULE).prof
-$(eval $(call copy-one-file,$(my_built_profile),$(my_installed_profile)))
-build_installed_profile:=$(my_built_profile):$(my_installed_profile)
 else
-build_installed_profile:=
-my_installed_profile :=
 $(built_odex): PRIVATE_PROFILE_PREOPT_FLAGS :=
 endif
 
@@ -232,11 +242,10 @@
 ALL_MODULES.$(my_register_name).INSTALLED += $(installed_odex)
 ALL_MODULES.$(my_register_name).INSTALLED += $(installed_vdex)
 ALL_MODULES.$(my_register_name).INSTALLED += $(installed_art)
-ALL_MODULES.$(my_register_name).INSTALLED += $(my_installed_profile)
+
 ALL_MODULES.$(my_register_name).BUILT_INSTALLED += $(built_installed_odex)
 ALL_MODULES.$(my_register_name).BUILT_INSTALLED += $(built_installed_vdex)
 ALL_MODULES.$(my_register_name).BUILT_INSTALLED += $(built_installed_art)
-ALL_MODULES.$(my_register_name).BUILT_INSTALLED += $(build_installed_profile)
 
 # Record dex-preopt config.
 DEXPREOPT.$(LOCAL_MODULE).DEX_PREOPT := $(LOCAL_DEX_PREOPT)
@@ -252,6 +261,12 @@
 
 
 # Make sure to install the .odex and .vdex when you run "make <module_name>"
-$(my_all_targets): $(installed_odex) $(installed_vdex) $(installed_art) $(my_installed_profile)
+$(my_all_targets): $(installed_odex) $(installed_vdex) $(installed_art)
 
 endif # LOCAL_DEX_PREOPT
+
+# Profile doesn't depend on LOCAL_DEX_PREOPT.
+ALL_MODULES.$(my_register_name).INSTALLED += $(my_installed_profile)
+ALL_MODULES.$(my_register_name).BUILT_INSTALLED += $(build_installed_profile)
+
+$(my_all_targets): $(my_installed_profile)
diff --git a/core/install_jni_libs.mk b/core/install_jni_libs.mk
index 6b550c1..e88db40 100644
--- a/core/install_jni_libs.mk
+++ b/core/install_jni_libs.mk
@@ -32,6 +32,11 @@
     my_embed_jni := true
   endif
 endif
+# If we're installing this APP as a compressed module, we include all JNI libraries
+# in the compressed artifact, rather than as separate files on the partition in question.
+ifdef LOCAL_COMPRESSED_MODULE
+my_embed_jni := true
+endif
 
 jni_shared_libraries :=
 jni_shared_libraries_abis :=
diff --git a/core/java.mk b/core/java.mk
index 5772ba2..e290d5c 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -369,6 +369,19 @@
 $(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_HAS_RS_SOURCES := $(if $(renderscript_sources),true)
 $(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_RS_SOURCE_INTERMEDIATES_DIR := $(intermediates.COMMON)/renderscript
 
+# Set the profile source so that the odex / profile code included from java.mk
+# can find it.
+#
+# TODO: b/64896089, this is broken when called from package_internal.mk, since the file
+# we preopt from is a temporary file. This will be addressed in a follow up, possibly
+# by disabling stripping for profile guided preopt (which may be desirable for other
+# reasons anyway).
+#
+# Note that we set this only when called from package_internal.mk and not in other cases.
+ifneq (,$(called_from_package_internal)
+dex_preopt_profile_src_file := $(LOCAL_BUILT_MODULE)
+endif
+
 #######################################
 # defines built_odex along with rule to install odex
 include $(BUILD_SYSTEM)/dex_preopt_odex_install.mk
diff --git a/core/java_library.mk b/core/java_library.mk
index d7c08cc..e4916b8 100644
--- a/core/java_library.mk
+++ b/core/java_library.mk
@@ -31,6 +31,7 @@
 # java libraries produce javalib.jar, so we will copy classes.jar there too.
 intermediates.COMMON := $(call local-intermediates-dir,COMMON)
 common_javalib.jar := $(intermediates.COMMON)/javalib.jar
+dex_preopt_profile_src_file := $(common_javalib.jar)
 LOCAL_INTERMEDIATE_TARGETS += $(common_javalib.jar)
 
 ifeq ($(LOCAL_PROGUARD_ENABLED),disabled)
diff --git a/core/main.mk b/core/main.mk
index e7ecd5e..90e365f 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -311,7 +311,7 @@
 
 # Sets the location that the runtime dumps stack traces to when signalled
 # with SIGQUIT. Stack trace dumping is turned on for all android builds.
-ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.stack-trace-file=/data/anr/traces.txt
+ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.stack-trace-dir=/data/anr
 
 # ------------------------------------------------------------
 # Define a function that, given a list of module tags, returns
@@ -750,8 +750,7 @@
 endef
 
 # TODO: Verify all branches/configs have reasonable warnings/errors, and remove
-# these overrides
-link-type-missing = $(eval $$(1).MISSING := true)
+# this override
 verify-link-type = $(eval $$(1).MISSING := true)
 
 $(foreach lt,$(ALL_LINK_TYPES),\
diff --git a/core/package_internal.mk b/core/package_internal.mk
index 9bf173f..0401699 100644
--- a/core/package_internal.mk
+++ b/core/package_internal.mk
@@ -222,8 +222,20 @@
 LOCAL_INTERMEDIATE_TARGETS += $(R_file_stamp)
 endif
 
+ifdef LOCAL_COMPRESSED_MODULE
+ifneq (true,$(LOCAL_COMPRESSED_MODULE))
+$(call pretty-error, Unknown value for LOCAL_COMPRESSED_MODULE $(LOCAL_COMPRESSED_MODULE))
+endif
+endif
+
+ifdef LOCAL_COMPRESSED_MODULE
+PACKAGES.$(LOCAL_PACKAGE_NAME).COMPRESSED := gz
+LOCAL_BUILT_MODULE_STEM := package.apk.gz
+LOCAL_INSTALLED_MODULE_STEM := $(LOCAL_MODULE).apk.gz
+else  # !LOCAL_COMPRESSED_MODULE
 LOCAL_BUILT_MODULE_STEM := package.apk
 LOCAL_INSTALLED_MODULE_STEM := $(LOCAL_MODULE).apk
+endif
 
 LOCAL_PROGUARD_ENABLED:=$(strip $(LOCAL_PROGUARD_ENABLED))
 ifndef LOCAL_PROGUARD_ENABLED
@@ -294,11 +306,19 @@
 LOCAL_AAPT_FLAGS += --auto-add-overlay --extra-packages com.android.databinding.library
 endif  # LOCAL_DATA_BINDING
 
+# If the module is a compressed module, we don't pre-opt it because its final
+# installation location will be the data partition.
+ifdef LOCAL_COMPRESSED_MODULE
+LOCAL_DEX_PREOPT := false
+endif
+
 include $(BUILD_SYSTEM)/android_manifest.mk
 
+called_from_package_internal := true
 #################################
 include $(BUILD_SYSTEM)/java.mk
 #################################
+called_from_package_internal :=
 
 LOCAL_SDK_RES_VERSION:=$(strip $(LOCAL_SDK_RES_VERSION))
 ifeq ($(LOCAL_SDK_RES_VERSION),)
@@ -346,6 +366,10 @@
 my_apk_split_configs :=
 
 ifdef LOCAL_PACKAGE_SPLITS
+ifdef LOCAL_COMPRESSED_MODULE
+$(error $(LOCAL_MODULE): LOCAL_COMPRESSED_MODULE is not currently supported for split installs)
+endif  # LOCAL_COMPRESSED_MODULE
+
 my_apk_split_configs := $(LOCAL_PACKAGE_SPLITS)
 my_split_suffixes := $(subst $(comma),_,$(my_apk_split_configs))
 built_apk_splits := $(foreach s,$(my_split_suffixes),$(intermediates)/package_$(s).apk)
@@ -550,6 +574,9 @@
 $(LOCAL_BUILT_MODULE): PRIVATE_RESOURCE_LIST := $(all_res_assets)
 $(LOCAL_BUILT_MODULE) : $(all_res_assets) $(full_android_manifest) $(AAPT) $(ZIPALIGN)
 endif
+ifdef LOCAL_COMPRESSED_MODULE
+$(LOCAL_BUILT_MODULE) : $(MINIGZIP)
+endif
 	@echo "target Package: $(PRIVATE_MODULE) ($@)"
 ifdef LOCAL_USE_AAPT2
 	$(call copy-file-to-new-target)
@@ -590,6 +617,9 @@
 	$(uncompress-dexs)
 endif  # PRODUCT_LOADED_BY_PRIVILEGED_MODULES
 	$(sign-package)
+ifdef LOCAL_COMPRESSED_MODULE
+	$(compress-package)
+endif  # LOCAL_COMPRESSED_MODULE
 
 ###############################
 ## Build dpi-specific apks, if it's apps_only build.
diff --git a/core/pathmap.mk b/core/pathmap.mk
index a1c20c9..af33f5d 100644
--- a/core/pathmap.mk
+++ b/core/pathmap.mk
@@ -80,6 +80,7 @@
 	    telecomm \
 	    telephony \
 	    wifi \
+	    lowpan \
 	    keystore \
 	    rs \
 	 )
diff --git a/core/pdk_config.mk b/core/pdk_config.mk
index dba748c..c2f8b0a 100644
--- a/core/pdk_config.mk
+++ b/core/pdk_config.mk
@@ -1,7 +1,10 @@
 # This file defines the rule to fuse the platform.zip into the current PDK build.
 PDK_PLATFORM_JAVA_ZIP_JAVA_TARGET_LIB_DIR :=
 PDK_PLATFORM_JAVA_ZIP_JAVA_HOST_LIB_DIR := \
-	host/common/obj/JAVA_LIBRARIES/bouncycastle-host_intermediates
+	host/common/obj/JAVA_LIBRARIES/bouncycastle-host_intermediates \
+	host/common/obj/JAVA_LIBRARIES/compatibility-host-util_intermediates \
+	host/common/obj/JAVA_LIBRARIES/cts-tradefed-harness_intermediates \
+	host/common/obj/JAVA_LIBRARIES/hosttestlib_intermediates
 PDK_PLATFORM_JAVA_ZIP_CONTENTS :=
 
 ifneq (,$(filter platform-java, $(MAKECMDGOALS))$(PDK_FUSION_PLATFORM_ZIP))
@@ -21,6 +24,7 @@
   target/common/obj/JAVA_LIBRARIES/core-oj_intermediates \
   target/common/obj/JAVA_LIBRARIES/core-libart_intermediates \
   target/common/obj/JAVA_LIBRARIES/legacy-test_intermediates \
+  target/common/obj/JAVA_LIBRARIES/legacy-android-test_intermediates \
   target/common/obj/JAVA_LIBRARIES/ext_intermediates \
   target/common/obj/JAVA_LIBRARIES/framework_intermediates \
   target/common/obj/JAVA_LIBRARIES/hwbinder_intermediates \
diff --git a/core/prebuilt_internal.mk b/core/prebuilt_internal.mk
index 48e410b..8be8ad6 100644
--- a/core/prebuilt_internal.mk
+++ b/core/prebuilt_internal.mk
@@ -105,13 +105,34 @@
   prebuilt_module_is_dex_javalib :=
 endif
 
-ifeq ($(LOCAL_MODULE_CLASS),APPS)
-LOCAL_BUILT_MODULE_STEM := package.apk
-ifndef LOCAL_INSTALLED_MODULE_STEM
-LOCAL_INSTALLED_MODULE_STEM := $(LOCAL_MODULE).apk
+ifdef LOCAL_COMPRESSED_MODULE
+ifneq (true,$(LOCAL_COMPRESSED_MODULE))
+$(call pretty-error, Unknown value for LOCAL_COMPRESSED_MODULE $(LOCAL_COMPRESSED_MODULE))
 endif
 endif
 
+ifeq ($(LOCAL_MODULE_CLASS),APPS)
+ifdef LOCAL_COMPRESSED_MODULE
+LOCAL_BUILT_MODULE_STEM := package.apk.gz
+else
+LOCAL_BUILT_MODULE_STEM := package.apk
+endif  # LOCAL_COMPRESSED_MODULE
+
+ifndef LOCAL_INSTALLED_MODULE_STEM
+ifdef LOCAL_COMPRESSED_MODULE
+PACKAGES.$(LOCAL_MODULE).COMPRESSED := gz
+LOCAL_INSTALLED_MODULE_STEM := $(LOCAL_MODULE).apk.gz
+else
+LOCAL_INSTALLED_MODULE_STEM := $(LOCAL_MODULE).apk
+endif  # LOCAL_COMPRESSED_MODULE
+endif  # LOCAL_INSTALLED_MODULE_STEM
+
+else  # $(LOCAL_MODULE_CLASS) != APPS)
+ifdef LOCAL_COMPRESSED_MODULE
+$(error $(LOCAL_MODULE) : LOCAL_COMPRESSED_MODULE can only be defined for module class APPS)
+endif  # LOCAL_COMPRESSED_MODULE
+endif
+
 ifneq ($(filter true keep_symbols no_debuglink mini-debug-info,$(my_strip_module) $(my_pack_module_relocations)),)
   ifdef LOCAL_IS_HOST_MODULE
     $(error Cannot strip/pack host module LOCAL_PATH=$(LOCAL_PATH))
@@ -276,6 +297,8 @@
 endif
 endif
 
+dex_preopt_profile_src_file := $(my_prebuilt_src_file)
+
 rs_compatibility_jni_libs :=
 include $(BUILD_SYSTEM)/install_jni_libs.mk
 
@@ -328,6 +351,12 @@
 endif
 endif
 
+# If the module is a compressed module, we don't pre-opt it because its final
+# installation location will be the data partition.
+ifdef LOCAL_COMPRESSED_MODULE
+LOCAL_DEX_PREOPT := false
+endif
+
 #######################################
 # defines built_odex along with rule to install odex
 include $(BUILD_SYSTEM)/dex_preopt_odex_install.mk
@@ -352,6 +381,10 @@
 endif
 $(built_module): PRIVATE_EMBEDDED_JNI_LIBS := $(embedded_prebuilt_jni_libs)
 
+ifdef LOCAL_COMPRESSED_MODULE
+$(built_module) : $(MINIGZIP)
+endif
+
 $(built_module) : $(my_prebuilt_src_file) | $(ZIPALIGN) $(SIGNAPK_JAR)
 	$(transform-prebuilt-to-target)
 	$(uncompress-shared-libs)
@@ -382,6 +415,9 @@
 else  # LOCAL_CERTIFICATE == PRESIGNED
 	$(align-package)
 endif  # LOCAL_CERTIFICATE
+ifdef LOCAL_COMPRESSED_MODULE
+	$(compress-package)
+endif  # LOCAL_COMPRESSED_MODULE
 endif  # ! LOCAL_REPLACE_PREBUILT_APK_INSTALLED
 
 ###############################
@@ -394,6 +430,10 @@
 ###############################
 ## Install split apks.
 ifdef LOCAL_PACKAGE_SPLITS
+ifdef LOCAL_COMPRESSED_MODULE
+$(error $(LOCAL_MODULE): LOCAL_COMPRESSED_MODULE is not currently supported for split installs)
+endif  # LOCAL_COMPRESSED_MODULE
+
 # LOCAL_PACKAGE_SPLITS is a list of apks to be installed.
 built_apk_splits := $(addprefix $(intermediates)/,$(notdir $(LOCAL_PACKAGE_SPLITS)))
 installed_apk_splits := $(addprefix $(my_module_path)/,$(notdir $(LOCAL_PACKAGE_SPLITS)))
diff --git a/core/tasks/sdk-addon.mk b/core/tasks/sdk-addon.mk
index 593c3cd..197d41a 100644
--- a/core/tasks/sdk-addon.mk
+++ b/core/tasks/sdk-addon.mk
@@ -115,7 +115,7 @@
 	$(hide) $(SOONG_ZIP) -o $@ -C $(dir $(PRIVATE_STAGING_DIR)) -D $(PRIVATE_STAGING_DIR)
 
 $(full_target_img): PRIVATE_STAGING_DIR := $(call append-path,$(staging),$(addon_dir_img))/images/$(TARGET_CPU_ABI)
-$(full_target_img): $(full_target) $(addon_img_source_prop) | $(SOONG_ZIP)
+$(full_target_img): $(full_target) $(addon_img_source_prop) | $(ACP) $(SOONG_ZIP)
 	@echo Packaging SDK Addon System-Image: $@
 	$(hide) mkdir -p $(dir $@)
 	$(ACP) -r $(PRODUCT_OUT)/data $(PRIVATE_STAGING_DIR)/data
diff --git a/core/tasks/tools/compatibility.mk b/core/tasks/tools/compatibility.mk
index 20b8314..0fc2045 100644
--- a/core/tasks/tools/compatibility.mk
+++ b/core/tasks/tools/compatibility.mk
@@ -19,6 +19,8 @@
 #   test_suite_tradefed: the name of this test suite's tradefed wrapper
 #   test_suite_dynamic_config: the path to this test suite's dynamic configuration file
 #   test_suite_readme: the path to a README file for this test suite
+#   test_suite_prebuilt_tools: the set of prebuilt tools to be included directly
+#                         in the 'tools' subdirectory of the test suite.
 # Output variables:
 #   compatibility_zip: the path to the output zip file.
 
@@ -39,10 +41,10 @@
 compatibility_zip := $(out_dir).zip
 $(compatibility_zip): PRIVATE_NAME := android-$(test_suite_name)
 $(compatibility_zip): PRIVATE_OUT_DIR := $(out_dir)
-$(compatibility_zip): PRIVATE_TOOLS := $(test_tools)
+$(compatibility_zip): PRIVATE_TOOLS := $(test_tools) $(test_suite_prebuilt_tools)
 $(compatibility_zip): PRIVATE_SUITE_NAME := $(test_suite_name)
 $(compatibility_zip): PRIVATE_DYNAMIC_CONFIG := $(test_suite_dynamic_config)
-$(compatibility_zip): $(test_artifacts) $(test_tools) $(test_suite_dynamic_config) $(SOONG_ZIP) | $(ADB) $(ACP)
+$(compatibility_zip): $(test_artifacts) $(test_tools) $(test_suite_prebuilt_tools) $(test_suite_dynamic_config) $(SOONG_ZIP) | $(ADB) $(ACP)
 # Make dir structure
 	$(hide) mkdir -p $(PRIVATE_OUT_DIR)/tools $(PRIVATE_OUT_DIR)/testcases
 # Copy tools
@@ -56,3 +58,4 @@
 test_suite_tradefed :=
 test_suite_dynamic_config :=
 test_suite_readme :=
+test_suite_prebuilt_tools :=
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index abf3067..e1aa9fc 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -49,12 +49,6 @@
 
 ifndef TARGET_PLATFORM_VERSION
   TARGET_PLATFORM_VERSION := $(DEFAULT_PLATFORM_VERSION)
-else ifeq ($(TARGET_PLATFORM_VERSION),OPR1)
-  # HACK: lunch currently sets TARGET_PLATFORM_VERSION to
-  # DEFAULT_PLATFORM_VERSION, which causes unnecessary pain
-  # when the old DEFAULT_PLATFORM_VERSION becomes invalid.
-  # For now, silently upgrade OPR1 to the current default.
-  TARGET_PLATFORM_VERSION := $(DEFAULT_PLATFORM_VERSION)
 endif
 
 ifeq (,$(filter $(ALLOWED_VERSIONS), $(TARGET_PLATFORM_VERSION)))
@@ -77,7 +71,8 @@
 # frameworks/support/compat/gingerbread/android/support/v4/os/BuildCompat.java
 
 # When you change PLATFORM_VERSION for a given PLATFORM_SDK_VERSION
-# please add that PLATFORM_VERSION to the following text file:
+# please add that PLATFORM_VERSION as well as clean up obsolete PLATFORM_VERSION's
+# in the following text file:
 # cts/tests/tests/os/assets/platform_versions.txt
 PLATFORM_VERSION.PPR1 := P
 
@@ -110,7 +105,7 @@
   # When you increment the PLATFORM_SDK_VERSION please ensure you also
   # clear out the following text file of all older PLATFORM_VERSION's:
   # cts/tests/tests/os/assets/platform_versions.txt
-  PLATFORM_SDK_VERSION := 26
+  PLATFORM_SDK_VERSION := 27
 endif
 
 ifndef PLATFORM_VERSION_CODENAME
@@ -171,7 +166,7 @@
     # assuming the device can only support APIs as of the previous official
     # public release.
     # This value will always be 0 for release builds.
-    PLATFORM_PREVIEW_SDK_VERSION := 1
+    PLATFORM_PREVIEW_SDK_VERSION := 0
   endif
 endif
 
@@ -194,7 +189,7 @@
     #  It must be of the form "YYYY-MM-DD" on production devices.
     #  It must match one of the Android Security Patch Level strings of the Public Security Bulletins.
     #  If there is no $PLATFORM_SECURITY_PATCH set, keep it empty.
-      PLATFORM_SECURITY_PATCH := 2017-10-05
+      PLATFORM_SECURITY_PATCH := 2017-12-05
 endif
 
 ifndef PLATFORM_BASE_OS
diff --git a/target/board/generic/sepolicy/file.te b/target/board/generic/sepolicy/file.te
deleted file mode 100644
index f4ae9e4..0000000
--- a/target/board/generic/sepolicy/file.te
+++ /dev/null
@@ -1 +0,0 @@
-type sysfs_writable, fs_type, sysfs_type, mlstrustedobject;
diff --git a/target/board/generic/sepolicy/file_contexts b/target/board/generic/sepolicy/file_contexts
index f550f4d..a9b1472 100644
--- a/target/board/generic/sepolicy/file_contexts
+++ b/target/board/generic/sepolicy/file_contexts
@@ -15,7 +15,6 @@
 /dev/qemu_.*                 u:object_r:qemu_device:s0
 /dev/ttyGF[0-9]*             u:object_r:serial_device:s0
 /dev/ttyS2                   u:object_r:console_device:s0
-/sys/qemu_trace(/.*)?        u:object_r:sysfs_writable:s0
 /vendor/bin/init\.ranchu-core\.sh u:object_r:goldfish_setup_exec:s0
 /vendor/bin/init\.ranchu-net\.sh u:object_r:goldfish_setup_exec:s0
 /vendor/bin/qemu-props       u:object_r:qemu_props_exec:s0
diff --git a/target/board/generic/sepolicy/hal_cas_default.te b/target/board/generic/sepolicy/hal_cas_default.te
new file mode 100644
index 0000000..3ed3bee
--- /dev/null
+++ b/target/board/generic/sepolicy/hal_cas_default.te
@@ -0,0 +1 @@
+vndbinder_use(hal_cas_default);
diff --git a/target/board/generic/sepolicy/hal_gnss_default.te b/target/board/generic/sepolicy/hal_gnss_default.te
index ddc68cc..0dd3d03 100644
--- a/target/board/generic/sepolicy/hal_gnss_default.te
+++ b/target/board/generic/sepolicy/hal_gnss_default.te
@@ -1 +1,3 @@
-vndbinder_use(hal_gnss_default);
+#============= hal_gnss_default ==============
+allow hal_gnss_default vndbinder_device:chr_file { ioctl open read write };
+
diff --git a/target/board/generic/sepolicy/hal_graphics_composer_default.te b/target/board/generic/sepolicy/hal_graphics_composer_default.te
index 40ecda6..034bdef 100644
--- a/target/board/generic/sepolicy/hal_graphics_composer_default.te
+++ b/target/board/generic/sepolicy/hal_graphics_composer_default.te
@@ -1 +1,3 @@
-vndbinder_use(hal_graphics_composer_default);
+#============= hal_graphics_composer_default ==============
+allow hal_graphics_composer_default vndbinder_device:chr_file { ioctl open read write };
+
diff --git a/target/board/generic_arm64_a/BoardConfig.mk b/target/board/generic_arm64_a/BoardConfig.mk
index 88bd87c..8f4043f 100644
--- a/target/board/generic_arm64_a/BoardConfig.mk
+++ b/target/board/generic_arm64_a/BoardConfig.mk
@@ -14,38 +14,7 @@
 # limitations under the License.
 #
 
-# Common boardconfig settings for generic AOSP products targetting mobile
-# (phone/table) devices.
-
-# Bootloader is not part of generic AOSP image
-TARGET_NO_BOOTLOADER := true
-
-# Kernel is also not part of generic AOSP image
-TARGET_NO_KERNEL := true
-
-# system.img is always ext4 with sparse option
-TARGET_USERIMAGES_USE_EXT4 := true
-TARGET_USERIMAGES_SPARSE_EXT_DISABLED := false
-TARGET_USES_MKE2FS := true
-
-# Enable dex pre-opt to speed up initial boot
-ifeq ($(HOST_OS),linux)
-  ifeq ($(WITH_DEXPREOPT),)
-    WITH_DEXPREOPT := true
-    WITH_DEXPREOPT_PIC := true
-    ifneq ($(TARGET_BUILD_VARIANT),user)
-      # Retain classes.dex in APK's for non-user builds
-      DEX_PREOPT_DEFAULT := nostripping
-    endif
-  endif
-endif
-
-# Generic AOSP image always requires separate vendor.img
-BOARD_USES_VENDORIMAGE := true
-TARGET_COPY_OUT_VENDOR := vendor
-
-# Generic AOSP image does NOT support HWC1
-TARGET_USES_HWC2 := true
+include build/make/target/board/treble_common_64.mk
 
 TARGET_ARCH := arm64
 TARGET_ARCH_VARIANT := armv8-a
@@ -57,13 +26,4 @@
 TARGET_2ND_ARCH_VARIANT := armv7-a-neon
 TARGET_2ND_CPU_ABI := armeabi-v7a
 TARGET_2ND_CPU_ABI2 := armeabi
-TARGET_2ND_CPU_VARIANT := generic
-
-TARGET_USES_64_BIT_BINDER := true
-
-BOARD_SYSTEMIMAGE_PARTITION_SIZE := 1610612736	# 1.5 GB
-
-BOARD_FLASH_BLOCK_SIZE := 512
-
-BOARD_PROPERTY_OVERRIDES_SPLIT_ENABLED := true
-
+TARGET_2ND_CPU_VARIANT := cortex-a15
diff --git a/target/board/generic_arm64_a/system.prop b/target/board/generic_arm64_a/system.prop
deleted file mode 100644
index e69de29..0000000
--- a/target/board/generic_arm64_a/system.prop
+++ /dev/null
diff --git a/target/board/generic_arm64_ab/BoardConfig.mk b/target/board/generic_arm64_ab/BoardConfig.mk
index 0c07566..e0d7372 100644
--- a/target/board/generic_arm64_ab/BoardConfig.mk
+++ b/target/board/generic_arm64_ab/BoardConfig.mk
@@ -14,39 +14,7 @@
 # limitations under the License.
 #
 
-# Common boardconfig settings for generic AOSP products targetting mobile
-# (phone/table) devices.
-
-# Bootloader is not part of generic AOSP image
-TARGET_NO_BOOTLOADER := true
-
-# Kernel is also not part of generic AOSP image
-TARGET_NO_KERNEL := true
-
-# system.img is always ext4 with sparse option
-TARGET_USERIMAGES_USE_EXT4 := true
-TARGET_USERIMAGES_SPARSE_EXT_DISABLED := false
-TARGET_USES_MKE2FS := true
-
-# Enable dex pre-opt to speed up initial boot
-ifeq ($(HOST_OS),linux)
-  ifeq ($(WITH_DEXPREOPT),)
-    WITH_DEXPREOPT := true
-    WITH_DEXPREOPT_PIC := true
-    ifneq ($(TARGET_BUILD_VARIANT),user)
-      # Retain classes.dex in APK's for non-user builds
-      DEX_PREOPT_DEFAULT := nostripping
-    endif
-  endif
-endif
-
-# Generic AOSP image always requires separate vendor.img
-BOARD_USES_VENDORIMAGE := true
-TARGET_COPY_OUT_VENDOR := vendor
-
-# Generic AOSP image does NOT support HWC1
-TARGET_USES_HWC2 := true
-NUM_FRAMEBUFFER_SURFACE_BUFFERS := 3
+include build/make/target/board/treble_common_64.mk
 
 TARGET_ARCH := arm64
 TARGET_ARCH_VARIANT := armv8-a
@@ -58,27 +26,16 @@
 TARGET_2ND_ARCH_VARIANT := armv7-a-neon
 TARGET_2ND_CPU_ABI := armeabi-v7a
 TARGET_2ND_CPU_ABI2 := armeabi
-# TODO(jiyong) can we set krait here?
 TARGET_2ND_CPU_VARIANT := cortex-a15
 
-TARGET_USES_64_BIT_BINDER := true
-
 # Enable A/B update
 TARGET_NO_RECOVERY := true
 BOARD_BUILD_SYSTEM_ROOT_IMAGE := true
 
 # TODO(jiyong) These might be SoC specific.
-BOARD_ROOT_EXTRA_FOLDERS := bt_firmware firmware firmware/radio persist
+BOARD_ROOT_EXTRA_FOLDERS += firmware firmware/radio persist
 BOARD_ROOT_EXTRA_SYMLINKS := /vendor/lib/dsp:/dsp
 
-# TODO(b/35603549): this is currently set to 2.5GB to support sailfish/marlin
-# Fix this!
-BOARD_SYSTEMIMAGE_PARTITION_SIZE := 2147483648
-
-BOARD_FLASH_BLOCK_SIZE := 512
-
-BOARD_PROPERTY_OVERRIDES_SPLIT_ENABLED := true
-
 # TODO(b/36764215): remove this setting when the generic system image
 # no longer has QCOM-specific directories under /.
 BOARD_SEPOLICY_DIRS += build/target/board/generic_arm64_ab/sepolicy
diff --git a/target/board/generic_arm64_ab/sepolicy/file.te b/target/board/generic_arm64_ab/sepolicy/file.te
index 4645533..7adfdfa 100644
--- a/target/board/generic_arm64_ab/sepolicy/file.te
+++ b/target/board/generic_arm64_ab/sepolicy/file.te
@@ -1,6 +1,5 @@
 # TODO(b/36764215): remove this file when the generic system image
 # no longer has these directories
-type bt_firmware_file, file_type;
 type persist_file, file_type;
 
 # Default type for anything under /firmware.
diff --git a/target/board/generic_arm64_ab/sepolicy/file_contexts b/target/board/generic_arm64_ab/sepolicy/file_contexts
index 92a4ff8..0a80559 100644
--- a/target/board/generic_arm64_ab/sepolicy/file_contexts
+++ b/target/board/generic_arm64_ab/sepolicy/file_contexts
@@ -2,7 +2,6 @@
 # no longer has these directories. They are specific to QCOM.
 
 # /
-/bt_firmware(/.*)?      u:object_r:bt_firmware_file:s0
 /tombstones             u:object_r:rootfs:s0
 /dsp                    u:object_r:rootfs:s0
 
diff --git a/target/board/generic_arm64_ab/system.prop b/target/board/generic_arm64_ab/system.prop
deleted file mode 100644
index e69de29..0000000
--- a/target/board/generic_arm64_ab/system.prop
+++ /dev/null
diff --git a/target/board/generic_arm_a/BoardConfig.mk b/target/board/generic_arm_a/BoardConfig.mk
index 6530e6e..d930749 100644
--- a/target/board/generic_arm_a/BoardConfig.mk
+++ b/target/board/generic_arm_a/BoardConfig.mk
@@ -14,48 +14,13 @@
 # limitations under the License.
 #
 
-# Common boardconfig settings for generic AOSP products targetting mobile
-# (phone/table) devices.
+include build/make/target/board/treble_common_32.mk
 
-# Bootloader is not part of generic AOSP image
-TARGET_NO_BOOTLOADER := true
-
-# Kernel is also not part of generic AOSP image
-TARGET_NO_KERNEL := true
-
-# system.img is always ext4 with sparse option
-TARGET_USERIMAGES_USE_EXT4 := true
-TARGET_USERIMAGES_SPARSE_EXT_DISABLED := false
-TARGET_USES_MKE2FS := true
-
-# Enable dex pre-opt to speed up initial boot
-ifeq ($(HOST_OS),linux)
-  ifeq ($(WITH_DEXPREOPT),)
-    WITH_DEXPREOPT := true
-    WITH_DEXPREOPT_PIC := true
-    ifneq ($(TARGET_BUILD_VARIANT),user)
-      # Retain classes.dex in APK's for non-user builds
-      DEX_PREOPT_DEFAULT := nostripping
-    endif
-  endif
-endif
-
-# Generic AOSP image always requires separate vendor.img
-BOARD_USES_VENDORIMAGE := true
-TARGET_COPY_OUT_VENDOR := vendor
-
-# Generic AOSP image does NOT support HWC1
-TARGET_USES_HWC2 := true
+# Overwrite the setting in treble_common_32.mk for non-A/B arm GSI
+BOARD_SYSTEMIMAGE_PARTITION_SIZE := 805306368 # 768MB
 
 TARGET_ARCH := arm
 TARGET_ARCH_VARIANT := armv7-a-neon
 TARGET_CPU_ABI := armeabi-v7a
 TARGET_CPU_ABI2 := armeabi
 TARGET_CPU_VARIANT := generic
-
-BOARD_SYSTEMIMAGE_PARTITION_SIZE := 1610612736
-
-BOARD_FLASH_BLOCK_SIZE := 512
-
-BOARD_PROPERTY_OVERRIDES_SPLIT_ENABLED := true
-
diff --git a/target/board/generic_arm_a/system.prop b/target/board/generic_arm_a/system.prop
deleted file mode 100644
index e69de29..0000000
--- a/target/board/generic_arm_a/system.prop
+++ /dev/null
diff --git a/target/board/generic_arm_ab/BoardConfig.mk b/target/board/generic_arm_ab/BoardConfig.mk
new file mode 100644
index 0000000..011bcdf
--- /dev/null
+++ b/target/board/generic_arm_ab/BoardConfig.mk
@@ -0,0 +1,30 @@
+#
+# Copyright (C) 2017 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.
+#
+
+include build/make/target/board/treble_common_32.mk
+
+# Overwrite the setting in treble_common_32.mk for non-A/B arm GSI
+BOARD_SYSTEMIMAGE_PARTITION_SIZE := 805306368 # 768MB
+
+TARGET_ARCH := arm
+TARGET_ARCH_VARIANT := armv7-a-neon
+TARGET_CPU_ABI := armeabi-v7a
+TARGET_CPU_ABI2 := armeabi
+TARGET_CPU_VARIANT := generic
+
+# Enable A/B update
+TARGET_NO_RECOVERY := true
+BOARD_BUILD_SYSTEM_ROOT_IMAGE := true
diff --git a/target/board/generic_mips/system.prop b/target/board/generic_mips/system.prop
index 137a0f9..973db2c 100644
--- a/target/board/generic_mips/system.prop
+++ b/target/board/generic_mips/system.prop
@@ -2,5 +2,5 @@
 # system.prop for generic sdk
 #
 
-rild.libpath=/system/lib/libreference-ril.so
+rild.libpath=/vendor/lib/libreference-ril.so
 rild.libargs=-d /dev/ttyS0
diff --git a/target/board/generic_x86_64_a/BoardConfig.mk b/target/board/generic_x86_64_a/BoardConfig.mk
new file mode 100644
index 0000000..2c02604
--- /dev/null
+++ b/target/board/generic_x86_64_a/BoardConfig.mk
@@ -0,0 +1,25 @@
+#
+# Copyright (C) 2017 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.
+#
+
+include build/make/target/board/treble_common_64.mk
+
+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
diff --git a/target/board/generic_x86_64_ab/BoardConfig.mk b/target/board/generic_x86_64_ab/BoardConfig.mk
new file mode 100644
index 0000000..e49863a
--- /dev/null
+++ b/target/board/generic_x86_64_ab/BoardConfig.mk
@@ -0,0 +1,29 @@
+#
+# Copyright (C) 2017 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.
+#
+
+include build/make/target/board/treble_common_64.mk
+
+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
+
+# Enable A/B update
+TARGET_NO_RECOVERY := true
+BOARD_BUILD_SYSTEM_ROOT_IMAGE := true
diff --git a/target/board/generic_x86_a/BoardConfig.mk b/target/board/generic_x86_a/BoardConfig.mk
new file mode 100644
index 0000000..67cb07d
--- /dev/null
+++ b/target/board/generic_x86_a/BoardConfig.mk
@@ -0,0 +1,21 @@
+#
+# Copyright (C) 2017 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.
+#
+
+include build/make/target/board/treble_common_32.mk
+
+TARGET_CPU_ABI := x86
+TARGET_ARCH := x86
+TARGET_ARCH_VARIANT := x86
diff --git a/target/board/generic_x86_ab/BoardConfig.mk b/target/board/generic_x86_ab/BoardConfig.mk
new file mode 100644
index 0000000..6e51102
--- /dev/null
+++ b/target/board/generic_x86_ab/BoardConfig.mk
@@ -0,0 +1,25 @@
+#
+# Copyright (C) 2017 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.
+#
+
+include build/make/target/board/treble_common_32.mk
+
+TARGET_CPU_ABI := x86
+TARGET_ARCH := x86
+TARGET_ARCH_VARIANT := x86
+
+# Enable A/B update
+TARGET_NO_RECOVERY := true
+BOARD_BUILD_SYSTEM_ROOT_IMAGE := true
diff --git a/target/board/treble_common.mk b/target/board/treble_common.mk
new file mode 100644
index 0000000..1ba6726
--- /dev/null
+++ b/target/board/treble_common.mk
@@ -0,0 +1,65 @@
+#
+# Copyright (C) 2017 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.
+#
+
+# Common boardconfig settings for generic AOSP products targetting mobile
+# (phone/table) devices.
+
+# VNDK
+BOARD_VNDK_VERSION := current
+BOARD_VNDK_RUNTIME_DISABLE := true
+
+# Properties
+TARGET_SYSTEM_PROP := build/make/target/board/treble_system.prop
+BOARD_PROPERTY_OVERRIDES_SPLIT_ENABLED := true
+
+# Bootloader, kernel and recovery are not part of generic AOSP image
+TARGET_NO_BOOTLOADER := true
+TARGET_NO_KERNEL := true
+
+# system.img is always ext4 with sparse option
+# GSI also includes make_f2fs to support userdata parition in f2fs
+# for some devices
+TARGET_USERIMAGES_USE_EXT4 := true
+TARGET_USERIMAGES_USE_F2FS := true
+TARGET_USERIMAGES_SPARSE_EXT_DISABLED := false
+TARGET_USES_MKE2FS := true
+
+# Generic AOSP image always requires separate vendor.img
+TARGET_COPY_OUT_VENDOR := vendor
+
+# Enable dex pre-opt to speed up initial boot
+ifeq ($(HOST_OS),linux)
+  ifeq ($(WITH_DEXPREOPT),)
+    WITH_DEXPREOPT := true
+    WITH_DEXPREOPT_PIC := true
+    ifneq ($(TARGET_BUILD_VARIANT),user)
+      # Retain classes.dex in APK's for non-user builds
+      DEX_PREOPT_DEFAULT := nostripping
+    endif
+  endif
+endif
+
+# Generic AOSP image does NOT support HWC1
+TARGET_USES_HWC2 := true
+# Set emulator framebuffer display device buffer count to 3
+NUM_FRAMEBUFFER_SURFACE_BUFFERS := 3
+
+BOARD_FLASH_BLOCK_SIZE := 512
+
+# b/64700195: add minimum support for odm.img
+# Currently odm.img can only be built by `make custom_images`.
+# Adding /odm mount point under root directory.
+BOARD_ROOT_EXTRA_FOLDERS += odm
diff --git a/target/board/treble_common_32.mk b/target/board/treble_common_32.mk
new file mode 100644
index 0000000..dbe0899
--- /dev/null
+++ b/target/board/treble_common_32.mk
@@ -0,0 +1,21 @@
+#
+# Copyright (C) 2017 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.
+#
+
+include build/make/target/board/treble_common.mk
+
+# Partition size defaults to 1 GB (1024 MB) for 32-bit products. It can
+# be overwritten in specific BoardConfig.mk, if so desired.
+BOARD_SYSTEMIMAGE_PARTITION_SIZE := 1073741824
diff --git a/target/board/treble_common_64.mk b/target/board/treble_common_64.mk
new file mode 100644
index 0000000..0a6eb17
--- /dev/null
+++ b/target/board/treble_common_64.mk
@@ -0,0 +1,23 @@
+#
+# Copyright (C) 2017 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.
+#
+
+include build/make/target/board/treble_common.mk
+
+# Enable 64-bits binder
+TARGET_USES_64_BIT_BINDER := true
+
+# Partition size is default 1.5GB (1536MB) for 64 bits projects
+BOARD_SYSTEMIMAGE_PARTITION_SIZE := 1610612736
diff --git a/target/board/treble_system.prop b/target/board/treble_system.prop
new file mode 100644
index 0000000..4b54aaf
--- /dev/null
+++ b/target/board/treble_system.prop
@@ -0,0 +1,5 @@
+# GSI always generate dex pre-opt in system image
+ro.cp_system_other_odex=0
+
+# GSI always disables adb authentication
+ro.adb.secure=0
diff --git a/target/product/AndroidProducts.mk b/target/product/AndroidProducts.mk
index 285fc39..9e2adee 100644
--- a/target/product/AndroidProducts.mk
+++ b/target/product/AndroidProducts.mk
@@ -52,8 +52,11 @@
     $(LOCAL_DIR)/generic_mips.mk \
     $(LOCAL_DIR)/aosp_arm.mk \
     $(LOCAL_DIR)/aosp_arm_a.mk \
+    $(LOCAL_DIR)/aosp_arm_ab.mk \
     $(LOCAL_DIR)/full.mk \
     $(LOCAL_DIR)/aosp_x86.mk \
+    $(LOCAL_DIR)/aosp_x86_a.mk \
+    $(LOCAL_DIR)/aosp_x86_ab.mk \
     $(LOCAL_DIR)/aosp_x86_arm.mk \
     $(LOCAL_DIR)/full_x86.mk \
     $(LOCAL_DIR)/aosp_mips.mk \
@@ -63,6 +66,8 @@
     $(LOCAL_DIR)/aosp_arm64_ab.mk \
     $(LOCAL_DIR)/aosp_mips64.mk \
     $(LOCAL_DIR)/aosp_x86_64.mk \
+    $(LOCAL_DIR)/aosp_x86_64_a.mk \
+    $(LOCAL_DIR)/aosp_x86_64_ab.mk \
     $(LOCAL_DIR)/sdk_phone_armv7.mk \
     $(LOCAL_DIR)/sdk_phone_x86.mk \
     $(LOCAL_DIR)/sdk_phone_mips.mk \
diff --git a/target/product/aosp_arm64_a.mk b/target/product/aosp_arm64_a.mk
index 4258f04..3c7af33 100644
--- a/target/product/aosp_arm64_a.mk
+++ b/target/product/aosp_arm64_a.mk
@@ -16,13 +16,10 @@
 
 # PRODUCT_PROPERTY_OVERRIDES cannot be used here because sysprops will be at
 # /vendor/[build|default].prop when build split is on. In order to have sysprops
-# on the generic system image, place them in build/make/target/board/generic_arm64_a/
-# system.prop.
+# on the generic system image, place them in build/make/target/board/
+# treble_system.prop.
 
-include build/make/target/product/treble_common.mk
-
-$(call inherit-product, $(SRC_TARGET_DIR)/product/core_64_bit.mk)
-$(call inherit-product, $(SRC_TARGET_DIR)/product/aosp_base_telephony.mk)
+include build/make/target/product/treble_common_64.mk
 
 PRODUCT_NAME := aosp_arm64_a
 PRODUCT_DEVICE := generic_arm64_a
diff --git a/target/product/aosp_arm64_ab.mk b/target/product/aosp_arm64_ab.mk
index ae50c42..c96cb91 100644
--- a/target/product/aosp_arm64_ab.mk
+++ b/target/product/aosp_arm64_ab.mk
@@ -16,10 +16,10 @@
 
 # PRODUCT_PROPERTY_OVERRIDES cannot be used here because sysprops will be at
 # /vendor/[build|default].prop when build split is on. In order to have sysprops
-# on the generic system image, place them in build/make/target/board/generic_arm64_a/
-# system.prop.
+# on the generic system image, place them in build/make/target/board/
+# treble_system.prop.
 
-include build/make/target/product/treble_common.mk
+include build/make/target/product/treble_common_64.mk
 
 AB_OTA_UPDATER := true
 AB_OTA_PARTITIONS := system
@@ -27,9 +27,6 @@
     update_engine \
     update_verifier
 
-$(call inherit-product, $(SRC_TARGET_DIR)/product/core_64_bit.mk)
-$(call inherit-product, $(SRC_TARGET_DIR)/product/aosp_base_telephony.mk)
-
 PRODUCT_NAME := aosp_arm64_ab
 PRODUCT_DEVICE := generic_arm64_ab
 PRODUCT_BRAND := Android
diff --git a/target/product/aosp_arm_a.mk b/target/product/aosp_arm_a.mk
index 6be8e82..3060fa9 100644
--- a/target/product/aosp_arm_a.mk
+++ b/target/product/aosp_arm_a.mk
@@ -16,12 +16,10 @@
 
 # PRODUCT_PROPERTY_OVERRIDES cannot be used here because sysprops will be at
 # /vendor/[build|default].prop when build split is on. In order to have sysprops
-# on the generic system image, place them in build/make/target/board/generic_arm_a/
-# system.prop.
+# on the generic system image, place them in build/make/target/board/
+# treble_system.prop.
 
-include build/make/target/product/treble_common.mk
-
-$(call inherit-product, $(SRC_TARGET_DIR)/product/aosp_base_telephony.mk)
+include build/make/target/product/treble_common_32.mk
 
 PRODUCT_NAME := aosp_arm_a
 PRODUCT_DEVICE := generic_arm_a
diff --git a/target/product/aosp_arm_ab.mk b/target/product/aosp_arm_ab.mk
new file mode 100644
index 0000000..98b2f99
--- /dev/null
+++ b/target/product/aosp_arm_ab.mk
@@ -0,0 +1,33 @@
+#
+# Copyright (C) 2017 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_PROPERTY_OVERRIDES cannot be used here because sysprops will be at
+# /vendor/[build|default].prop when build split is on. In order to have sysprops
+# on the generic system image, place them in build/make/target/board/
+# treble_system.prop.
+
+include build/make/target/product/treble_common_32.mk
+
+AB_OTA_UPDATER := true
+AB_OTA_PARTITIONS := system
+PRODUCT_PACKAGES += \
+    update_engine \
+    update_verifier
+
+PRODUCT_NAME := aosp_arm_ab
+PRODUCT_DEVICE := generic_arm_ab
+PRODUCT_BRAND := Android
+PRODUCT_MODEL := AOSP on ARM32
diff --git a/target/product/aosp_x86_64_a.mk b/target/product/aosp_x86_64_a.mk
new file mode 100644
index 0000000..a7fb740
--- /dev/null
+++ b/target/product/aosp_x86_64_a.mk
@@ -0,0 +1,27 @@
+#
+# Copyright (C) 2017 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_PROPERTY_OVERRIDES cannot be used here because sysprops will be at
+# /vendor/[build|default].prop when build split is on. In order to have sysprops
+# on the generic system image, place them in build/make/target/board/
+# treble_system.prop.
+
+include build/make/target/product/treble_common_64.mk
+
+PRODUCT_NAME := aosp_x86_64_a
+PRODUCT_DEVICE := generic_x86_64_a
+PRODUCT_BRAND := Android
+PRODUCT_MODEL := AOSP on x86_64
diff --git a/target/product/aosp_x86_64_ab.mk b/target/product/aosp_x86_64_ab.mk
new file mode 100644
index 0000000..4590dc5
--- /dev/null
+++ b/target/product/aosp_x86_64_ab.mk
@@ -0,0 +1,33 @@
+#
+# Copyright (C) 2017 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_PROPERTY_OVERRIDES cannot be used here because sysprops will be at
+# /vendor/[build|default].prop when build split is on. In order to have sysprops
+# on the generic system image, place them in build/make/target/board/
+# treble_system.prop.
+
+include build/make/target/product/treble_common_64.mk
+
+AB_OTA_UPDATER := true
+AB_OTA_PARTITIONS := system
+PRODUCT_PACKAGES += \
+    update_engine \
+    update_verifier
+
+PRODUCT_NAME := aosp_x86_64_ab
+PRODUCT_DEVICE := generic_x86_64_ab
+PRODUCT_BRAND := Android
+PRODUCT_MODEL := AOSP on x86_64
diff --git a/target/product/aosp_x86_a.mk b/target/product/aosp_x86_a.mk
new file mode 100644
index 0000000..9ed2995
--- /dev/null
+++ b/target/product/aosp_x86_a.mk
@@ -0,0 +1,27 @@
+#
+# Copyright (C) 2017 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_PROPERTY_OVERRIDES cannot be used here because sysprops will be at
+# /vendor/[build|default].prop when build split is on. In order to have sysprops
+# on the generic system image, place them in build/make/target/board/
+# treble_system.prop.
+
+include build/make/target/product/treble_common_32.mk
+
+PRODUCT_NAME := aosp_x86_a
+PRODUCT_DEVICE := generic_x86_a
+PRODUCT_BRAND := Android
+PRODUCT_MODEL := AOSP on x86
diff --git a/target/product/aosp_x86_ab.mk b/target/product/aosp_x86_ab.mk
new file mode 100644
index 0000000..404a4da
--- /dev/null
+++ b/target/product/aosp_x86_ab.mk
@@ -0,0 +1,33 @@
+#
+# Copyright (C) 2017 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_PROPERTY_OVERRIDES cannot be used here because sysprops will be at
+# /vendor/[build|default].prop when build split is on. In order to have sysprops
+# on the generic system image, place them in build/make/target/board/
+# treble_system.prop.
+
+include build/make/target/product/treble_common_32.mk
+
+AB_OTA_UPDATER := true
+AB_OTA_PARTITIONS := system
+PRODUCT_PACKAGES += \
+    update_engine \
+    update_verifier
+
+PRODUCT_NAME := aosp_x86_ab
+PRODUCT_DEVICE := generic_x86_ab
+PRODUCT_BRAND := Android
+PRODUCT_MODEL := AOSP on x86
diff --git a/target/product/base.mk b/target/product/base.mk
index a182f18..c3eb3b2 100644
--- a/target/product/base.mk
+++ b/target/product/base.mk
@@ -76,8 +76,6 @@
     libnetlink \
     libnetutils \
     libpdfium \
-    libradio \
-    libradioservice \
     libradio_metadata \
     libreference-ril \
     libreverbwrapper \
@@ -140,6 +138,7 @@
 
 # Essential HAL modules
 PRODUCT_PACKAGES += \
+    android.hardware.cas@1.0-service \
     android.hardware.media.omx@1.0-service
 
 # XML schema files
diff --git a/target/product/core_minimal.mk b/target/product/core_minimal.mk
index fc9da87..345b5d2 100644
--- a/target/product/core_minimal.mk
+++ b/target/product/core_minimal.mk
@@ -71,6 +71,7 @@
     libfilterfw \
     libkeystore \
     libgatekeeper \
+    libneuralnetworks \
     libwebviewchromium_loader \
     libwebviewchromium_plat_support \
     libwilhelm \
diff --git a/target/product/embedded.mk b/target/product/embedded.mk
index 4e1adc8..6a5e606 100644
--- a/target/product/embedded.mk
+++ b/target/product/embedded.mk
@@ -20,7 +20,7 @@
 PRODUCT_PACKAGES += \
     adb \
     adbd \
-    android.hardware.configstore@1.1-service \
+    android.hardware.configstore@1.0-service \
     android.hidl.allocator@1.0-service \
     android.hidl.memory@1.0-impl \
     atrace \
@@ -76,6 +76,7 @@
     shell_and_utilities \
     storaged \
     surfaceflinger \
+    thermalserviced \
     tombstoned \
     tzdatacheck \
     vndservice \
diff --git a/target/product/emulator.mk b/target/product/emulator.mk
index 58245cb..13b8f28 100644
--- a/target/product/emulator.mk
+++ b/target/product/emulator.mk
@@ -110,8 +110,8 @@
     vndk-sp
 
 PRODUCT_COPY_FILES += \
-    device/generic/goldfish/init.ranchu-core.sh:$(TARGET_COPY_OUT_VENDOR)/bin/init.ranchu-core.sh \
-    device/generic/goldfish/init.ranchu-net.sh:$(TARGET_COPY_OUT_VENDOR)/bin/init.ranchu-net.sh \
+    device/generic/goldfish/init.ranchu-core.sh:vendor/bin/init.ranchu-core.sh \
+    device/generic/goldfish/init.ranchu-net.sh:vendor/bin/init.ranchu-net.sh \
     device/generic/goldfish/init.ranchu.rc:root/init.ranchu.rc \
     device/generic/goldfish/fstab.ranchu:root/fstab.ranchu \
     device/generic/goldfish/fstab.ranchu.early:root/fstab.ranchu.early \
diff --git a/target/product/go_defaults.mk b/target/product/go_defaults.mk
new file mode 100644
index 0000000..faa1852
--- /dev/null
+++ b/target/product/go_defaults.mk
@@ -0,0 +1,19 @@
+#
+# Copyright (C) 2017 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.
+#
+
+# Inherit common Android Go defaults.
+$(call inherit-product, build/target/product/go_defaults_common.mk)
+
diff --git a/target/product/go_defaults_512.mk b/target/product/go_defaults_512.mk
new file mode 100644
index 0000000..56ab29b
--- /dev/null
+++ b/target/product/go_defaults_512.mk
@@ -0,0 +1,28 @@
+#
+# Copyright (C) 2017 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Inherit common Android Go defaults.
+$(call inherit-product, build/target/product/go_defaults_common.mk)
+
+# 512MB specific properties.
+
+# lmkd can kill more now.
+PRODUCT_PROPERTY_OVERRIDES += \
+     ro.lmk.medium=700 \
+
+# madvise random in ART to reduce page cache thrashing.
+PRODUCT_PROPERTY_OVERRIDES += \
+     dalvik.vm.madvise-random=true
diff --git a/target/product/go_defaults_common.mk b/target/product/go_defaults_common.mk
new file mode 100644
index 0000000..ca58c1d
--- /dev/null
+++ b/target/product/go_defaults_common.mk
@@ -0,0 +1,64 @@
+#
+# Copyright (C) 2017 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.
+#
+
+# Sets Android Go recommended default values for propreties.
+
+# Set lowram options
+PRODUCT_PROPERTY_OVERRIDES += \
+     ro.config.low_ram=true \
+     ro.lmk.critical_upgrade=true \
+     ro.lmk.upgrade_pressure=40
+
+# set threshold to filter unused apps
+PRODUCT_PROPERTY_OVERRIDES += \
+     pm.dexopt.downgrade_after_inactive_days=10
+
+
+# Speed profile services and wifi-service to reduce RAM and storage.
+PRODUCT_SYSTEM_SERVER_COMPILER_FILTER := speed-profile
+
+# Always preopt extracted APKs to prevent extracting out of the APK for gms
+# modules.
+PRODUCT_ALWAYS_PREOPT_EXTRACTED_APK := true
+
+# Use a profile based boot image for this device. Note that this is currently a
+# generic profile and not Android Go optimized.
+PRODUCT_USE_PROFILE_FOR_BOOT_IMAGE := true
+PRODUCT_DEX_PREOPT_BOOT_IMAGE_PROFILE_LOCATION := frameworks/base/config/boot-image-profile.txt
+
+# set the compiler filter for shared apks to quicken.
+# Rationale: speed has a lot of dex code expansion, it uses more ram and space
+# compared to quicken. Using quicken for shared APKs on Go devices may save RAM.
+# Note that this is a trade-off: here we trade clean pages for dirty pages,
+# extra cpu and battery. That's because the quicken files will be jit-ed in all
+# the processes that load of shared apk and the code cache is not shared.
+# Some notable apps that will be affected by this are gms and chrome.
+# b/65591595.
+PRODUCT_PROPERTY_OVERRIDES += \
+     pm.dexopt.shared=quicken
+
+# Default heap sizes. Allow up to 256m for large heaps to make sure a single app
+# doesn't take all of the RAM.
+PRODUCT_PROPERTY_OVERRIDES += dalvik.vm.heapgrowthlimit=128m
+PRODUCT_PROPERTY_OVERRIDES += dalvik.vm.heapsize=256m
+
+# Do not generate libartd.
+PRODUCT_ART_TARGET_INCLUDE_DEBUG_BUILD := false
+
+# Strip the local variable table and the local variable type table to reduce
+# the size of the system image. This has no bearing on stack traces, but will
+# leave less information available via JDWP.
+PRODUCT_MINIMIZE_JAVA_DEBUG_INFO := true
diff --git a/target/product/languages_full.mk b/target/product/languages_full.mk
index 36c3de8..846cd70 100644
--- a/target/product/languages_full.mk
+++ b/target/product/languages_full.mk
@@ -15,10 +15,91 @@
 #
 
 # This is a build configuration that just contains a list of languages.
-# It helps in situations where languages must come first in the list,
-# mostly because screen densities interfere with the list of locales and
-# the system misbehaves when a density is the first locale.
-
-# These are all the locales that have translations and are displayable
-# by TextView in this branch.
-PRODUCT_LOCALES := en_US en_AU en_IN fr_FR it_IT es_ES et_EE de_DE nl_NL cs_CZ pl_PL ja_JP zh_TW zh_CN zh_HK ru_RU ko_KR nb_NO es_US da_DK el_GR tr_TR pt_PT pt_BR sv_SE bg_BG ca_ES en_GB fi_FI hi_IN hr_HR hu_HU in_ID iw_IL lt_LT lv_LV ro_RO sk_SK sl_SI sr_RS uk_UA vi_VN tl_PH ar_EG fa_IR th_TH sw_TZ ms_MY af_ZA zu_ZA am_ET en_XA ar_XB fr_CA km_KH lo_LA ne_NP si_LK mn_MN hy_AM az_AZ ka_GE my_MM mr_IN ml_IN is_IS mk_MK ky_KG eu_ES gl_ES bn_BD ta_IN kn_IN te_IN uz_UZ ur_PK kk_KZ sq_AL gu_IN pa_IN be_BY bs_BA sr_Latn_RS
+#
+# These are all the locales that have translations.
+PRODUCT_LOCALES := \
+        en_US \
+        af_ZA \
+        am_ET \
+        ar_EG \
+        ar_XB \
+        az_AZ \
+        be_BY \
+        bg_BG \
+        bn_BD \
+        bs_BA \
+        ca_ES \
+        cs_CZ \
+        da_DK \
+        de_DE \
+        el_GR \
+        en_AU \
+        en_CA \
+        en_GB \
+        en_IN \
+        en_XA \
+        en_XC \
+        es_ES \
+        es_US \
+        et_EE \
+        eu_ES \
+        fa_IR \
+        fi_FI \
+        fr_CA \
+        fr_FR \
+        gl_ES \
+        gu_IN \
+        hi_IN \
+        hr_HR \
+        hu_HU \
+        hy_AM \
+        in_ID \
+        is_IS \
+        it_IT \
+        iw_IL \
+        ja_JP \
+        ka_GE \
+        kk_KZ \
+        km_KH \
+        kn_IN \
+        ko_KR \
+        ky_KG \
+        lo_LA \
+        lt_LT \
+        lv_LV \
+        mk_MK \
+        ml_IN \
+        mn_MN \
+        mr_IN \
+        ms_MY \
+        my_MM \
+        nb_NO \
+        ne_NP \
+        nl_NL \
+        pa_IN \
+        pl_PL \
+        pt_BR \
+        pt_PT \
+        ro_RO \
+        ru_RU \
+        si_LK \
+        sk_SK \
+        sl_SI \
+        sq_AL \
+        sr_Latn_RS \
+        sr_RS \
+        sv_SE \
+        sw_TZ \
+        ta_IN \
+        te_IN \
+        th_TH \
+        tl_PH \
+        tr_TR \
+        uk_UA \
+        ur_PK \
+        uz_UZ \
+        vi_VN \
+        zh_CN \
+        zh_HK \
+        zh_TW \
+        zu_ZA
diff --git a/target/product/product_launched_with_o_mr1.mk b/target/product/product_launched_with_o_mr1.mk
new file mode 100644
index 0000000..25620aa
--- /dev/null
+++ b/target/product/product_launched_with_o_mr1.mk
@@ -0,0 +1,2 @@
+#PRODUCT_SHIPPING_API_LEVEL indicates the first api level, device has been commercially launced on.
+PRODUCT_SHIPPING_API_LEVEL := 27
diff --git a/target/product/treble_common.mk b/target/product/treble_common.mk
index 829d5f1..13b7769 100644
--- a/target/product/treble_common.mk
+++ b/target/product/treble_common.mk
@@ -14,9 +14,23 @@
 # limitations under the License.
 #
 
+# PRODUCT_PROPERTY_OVERRIDES cannot be used here because sysprops will be at
+# /vendor/[build|default].prop when build split is on. In order to have sysprops
+# on the generic system image, place them in build/make/target/board/
+# treble_system.prop.
+
+# Generic system image inherits from AOSP with telephony
+$(call inherit-product, $(SRC_TARGET_DIR)/product/aosp_base.mk)
+$(call inherit-product, $(SRC_TARGET_DIR)/product/telephony.mk)
+
 # Split selinux policy
 PRODUCT_FULL_TREBLE_OVERRIDE := true
 
+# The Messaging app:
+#   Needed for android.telecom.cts.ExtendedInCallServiceTest#testOnCannedTextResponsesLoaded
+PRODUCT_PACKAGES += \
+    messaging
+
 # All VNDK libraries (HAL interfaces, VNDK, VNDK-SP, LL-NDK)
 PRODUCT_PACKAGES += vndk_package
 
@@ -40,3 +54,21 @@
 #   audio.a2dp.default to support A2DP if board has the capability.
 PRODUCT_PACKAGES += \
     audio.a2dp.default
+
+# Net:
+#   Vendors can use the platform-provided network configuration utilities (ip,
+#   iptable, etc.) to configure the Linux networking stack, but these utilities
+#   do not yet include a HIDL interface wrapper. This is a solution on
+#   Android O.
+PRODUCT_PACKAGES += \
+    netutils-wrapper-1.0
+
+# Android Verified Boot (AVB):
+#   Builds a special vbmeta.img that disables AVB verification.
+#   Otherwise, AVB will prevent the device from booting the generic system.img.
+#   Also checks that BOARD_AVB_ENABLE is not set, to prevent adding verity
+#   metadata into system.img.
+ifeq ($(BOARD_AVB_ENABLE),true)
+$(error BOARD_AVB_ENABLE cannot be set for Treble GSI)
+endif
+BOARD_BUILD_DISABLED_VBMETAIMAGE := true
diff --git a/target/product/treble_common_32.mk b/target/product/treble_common_32.mk
new file mode 100644
index 0000000..0023c3b
--- /dev/null
+++ b/target/product/treble_common_32.mk
@@ -0,0 +1,22 @@
+#
+# Copyright (C) 2017 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_PROPERTY_OVERRIDES cannot be used here because sysprops will be at
+# /vendor/[build|default].prop when build split is on. In order to have sysprops
+# on the generic system image, place them in build/make/target/board/
+# treble_system.prop.
+
+include build/make/target/product/treble_common.mk
diff --git a/target/product/treble_common_64.mk b/target/product/treble_common_64.mk
new file mode 100644
index 0000000..fc3c16f
--- /dev/null
+++ b/target/product/treble_common_64.mk
@@ -0,0 +1,37 @@
+#
+# Copyright (C) 2017 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_PROPERTY_OVERRIDES cannot be used here because sysprops will be at
+# /vendor/[build|default].prop when build split is on. In order to have sysprops
+# on the generic system image, place them in build/make/target/board/
+# treble_system.prop.
+
+include build/make/target/product/treble_common.mk
+
+# For now this will allow 64-bit apps, but still compile all apps with JNI
+# for 32-bit only.
+
+# Copy different zygote settings for vendor.img to select by setting property
+# ro.zygote=zygote64_32 or ro.zygote=zygote32_64:
+#   1. 64-bit primary, 32-bit secondary OR
+#   2. 32-bit primary, 64-bit secondary
+#   3. 64-bit only is currently forbidden (b/64280459#comment6)
+PRODUCT_COPY_FILES += \
+    system/core/rootdir/init.zygote64_32.rc:root/init.zygote64_32.rc \
+    system/core/rootdir/init.zygote32_64.rc:root/init.zygote32_64.rc
+
+TARGET_SUPPORTS_32_BIT_APPS := true
+TARGET_SUPPORTS_64_BIT_APPS := true
diff --git a/target/product/vndk/Android.mk b/target/product/vndk/Android.mk
index e7f07e7..6e8a85f 100644
--- a/target/product/vndk/Android.mk
+++ b/target/product/vndk/Android.mk
@@ -100,7 +100,9 @@
 LOCAL_REQUIRED_MODULES := \
     $(addsuffix .vendor,$(VNDK_CORE_LIBRARIES)) \
     $(addsuffix .vendor,$(VNDK_SAMEPROCESS_LIBRARIES)) \
-    $(LLNDK_LIBRARIES)
+    $(LLNDK_LIBRARIES) \
+    llndk.libraries.txt \
+    vndksp.libraries.txt
 
 include $(BUILD_PHONY_PACKAGE)
 endif # BOARD_VNDK_VERSION is set
diff --git a/tools/releasetools/check_target_files_signatures.py b/tools/releasetools/check_target_files_signatures.py
index f9aa4fa..c4877e0 100755
--- a/tools/releasetools/check_target_files_signatures.py
+++ b/tools/releasetools/check_target_files_signatures.py
@@ -235,12 +235,40 @@
     self.certmap = None
 
   def LoadZipFile(self, filename):
-    d, z = common.UnzipTemp(filename, ['*.apk'])
+    # First read the APK certs file to figure out whether there are compressed
+    # APKs in the archive. If we do have compressed APKs in the archive, then we
+    # must decompress them individually before we perform any analysis.
+
+    # This is the list of wildcards of files we extract from |filename|.
+    apk_extensions = ['*.apk']
+
+    self.certmap, compressed_extension = common.ReadApkCerts(zipfile.ZipFile(filename, "r"))
+    if compressed_extension:
+      apk_extensions.append("*.apk" + compressed_extension)
+
+    d, z = common.UnzipTemp(filename, apk_extensions)
     try:
       self.apks = {}
       self.apks_by_basename = {}
       for dirpath, _, filenames in os.walk(d):
         for fn in filenames:
+          # Decompress compressed APKs before we begin processing them.
+          if compressed_extension and fn.endswith(compressed_extension):
+            # First strip the compressed extension from the file.
+            uncompressed_fn = fn[:-len(compressed_extension)]
+
+            # Decompress the compressed file to the output file.
+            common.Gunzip(os.path.join(dirpath, fn),
+                          os.path.join(dirpath, uncompressed_fn))
+
+            # Finally, delete the compressed file and use the uncompressed file
+            # for further processing. Note that the deletion is not strictly required,
+            # but is done here to ensure that we're not using too much space in
+            # the temporary directory.
+            os.remove(os.path.join(dirpath, fn))
+            fn = uncompressed_fn
+
+
           if fn.endswith(".apk"):
             fullname = os.path.join(dirpath, fn)
             displayname = fullname[len(d)+1:]
@@ -253,7 +281,6 @@
     finally:
       shutil.rmtree(d)
 
-    self.certmap = common.ReadApkCerts(z)
     z.close()
 
   def CheckSharedUids(self):
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index 9726125..3e58651 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -18,6 +18,7 @@
 import errno
 import getopt
 import getpass
+import gzip
 import imp
 import os
 import platform
@@ -557,6 +558,13 @@
   return None
 
 
+def Gunzip(in_filename, out_filename):
+  """Gunzip the given gzip compressed file to a given output file.
+  """
+  with gzip.open(in_filename, "rb") as in_file, open(out_filename, "wb") as out_file:
+    shutil.copyfileobj(in_file, out_file)
+
+
 def UnzipTemp(filename, pattern=None):
   """Unzip the given archive into a temporary directory and return the name.
 
@@ -762,16 +770,34 @@
 
 def ReadApkCerts(tf_zip):
   """Given a target_files ZipFile, parse the META/apkcerts.txt file
-  and return a {package: cert} dict."""
+  and return a tuple with the following elements: (1) a dictionary that maps
+  packages to certs (based on the "certificate" and "private_key" attributes
+  in the file. (2) A string representing the extension of compressed APKs in
+  the target files (e.g ".gz" ".bro")."""
   certmap = {}
+  compressed_extension = None
+
+  # META/apkcerts.txt contains the info for _all_ the packages known at build
+  # time. Filter out the ones that are not installed.
+  installed_files = set()
+  for name in tf_zip.namelist():
+    basename = os.path.basename(name)
+    if basename:
+      installed_files.add(basename)
+
   for line in tf_zip.read("META/apkcerts.txt").split("\n"):
     line = line.strip()
     if not line:
       continue
-    m = re.match(r'^name="(.*)"\s+certificate="(.*)"\s+'
-                 r'private_key="(.*)"$', line)
+    m = re.match(r'^name="(?P<NAME>.*)"\s+certificate="(?P<CERT>.*)"\s+'
+                 r'private_key="(?P<PRIVKEY>.*?)"(\s+compressed="(?P<COMPRESSED>.*)")?$',
+                 line)
     if m:
-      name, cert, privkey = m.groups()
+      matches = m.groupdict()
+      cert = matches["CERT"]
+      privkey = matches["PRIVKEY"]
+      name = matches["NAME"]
+      this_compressed_extension = matches["COMPRESSED"]
       public_key_suffix_len = len(OPTIONS.public_key_suffix)
       private_key_suffix_len = len(OPTIONS.private_key_suffix)
       if cert in SPECIAL_CERT_STRINGS and not privkey:
@@ -782,7 +808,22 @@
         certmap[name] = cert[:-public_key_suffix_len]
       else:
         raise ValueError("failed to parse line from apkcerts.txt:\n" + line)
-  return certmap
+      if this_compressed_extension:
+        # Only count the installed files.
+        filename = name + '.' + this_compressed_extension
+        if filename not in installed_files:
+          continue
+        # Make sure that all the values in the compression map have the same
+        # extension. We don't support multiple compression methods in the same
+        # system image.
+        if compressed_extension:
+          if this_compressed_extension != compressed_extension:
+            raise ValueError("multiple compressed extensions : %s vs %s",
+                             (compressed_extension, this_compressed_extension))
+        else:
+          compressed_extension = this_compressed_extension
+
+  return (certmap, ("." + compressed_extension) if compressed_extension else None)
 
 
 COMMON_DOCSTRING = """
diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index 60aa84e..63af8b0 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -1122,6 +1122,11 @@
          "--target_image", target_file]
   if source_file is not None:
     cmd.extend(["--source_image", source_file])
+  if OPTIONS.downgrade:
+    max_timestamp = GetBuildProp("ro.build.date.utc", OPTIONS.source_info_dict)
+  else:
+    max_timestamp = metadata["post-timestamp"]
+  cmd.extend(["--max_timestamp", max_timestamp])
   p1 = common.Run(cmd, stdout=log_file, stderr=subprocess.STDOUT)
   p1.communicate()
   assert p1.returncode == 0, "brillo_update_payload generate failed"
diff --git a/tools/releasetools/sign_target_files_apks.py b/tools/releasetools/sign_target_files_apks.py
index 58bf489..83c2487 100755
--- a/tools/releasetools/sign_target_files_apks.py
+++ b/tools/releasetools/sign_target_files_apks.py
@@ -100,8 +100,10 @@
 import cStringIO
 import copy
 import errno
+import gzip
 import os
 import re
+import shutil
 import stat
 import subprocess
 import tempfile
@@ -124,9 +126,7 @@
 OPTIONS.avb_algorithms = {}
 OPTIONS.avb_extra_args = {}
 
-def GetApkCerts(tf_zip):
-  certmap = common.ReadApkCerts(tf_zip)
-
+def GetApkCerts(certmap):
   # apply the key remapping to the contents of the file
   for apk, cert in certmap.iteritems():
     certmap[apk] = OPTIONS.key_map.get(cert, cert)
@@ -140,13 +140,19 @@
   return certmap
 
 
-def CheckAllApksSigned(input_tf_zip, apk_key_map):
+def CheckAllApksSigned(input_tf_zip, apk_key_map, compressed_extension):
   """Check that all the APKs we want to sign have keys specified, and
   error out if they don't."""
   unknown_apks = []
+  compressed_apk_extension = None
+  if compressed_extension:
+    compressed_apk_extension = ".apk" + compressed_extension
   for info in input_tf_zip.infolist():
-    if info.filename.endswith(".apk"):
+    if (info.filename.endswith(".apk") or
+        (compressed_apk_extension and info.filename.endswith(compressed_apk_extension))):
       name = os.path.basename(info.filename)
+      if compressed_apk_extension and name.endswith(compressed_apk_extension):
+        name = name[:-len(compressed_extension)]
       if name not in apk_key_map:
         unknown_apks.append(name)
   if unknown_apks:
@@ -157,11 +163,25 @@
     sys.exit(1)
 
 
-def SignApk(data, keyname, pw, platform_api_level, codename_to_api_level_map):
+def SignApk(data, keyname, pw, platform_api_level, codename_to_api_level_map,
+            is_compressed):
   unsigned = tempfile.NamedTemporaryFile()
   unsigned.write(data)
   unsigned.flush()
 
+  if is_compressed:
+    uncompressed = tempfile.NamedTemporaryFile()
+    with gzip.open(unsigned.name, "rb") as in_file, open(uncompressed.name, "wb") as out_file:
+      shutil.copyfileobj(in_file, out_file)
+
+    # Finally, close the "unsigned" file (which is gzip compressed), and then
+    # replace it with the uncompressed version.
+    #
+    # TODO(narayan): All this nastiness can be avoided if python 3.2 is in use,
+    # we could just gzip / gunzip in-memory buffers instead.
+    unsigned.close()
+    unsigned = uncompressed
+
   signed = tempfile.NamedTemporaryFile()
 
   # For pre-N builds, don't upgrade to SHA-256 JAR signatures based on the APK's
@@ -186,7 +206,18 @@
       min_api_level=min_api_level,
       codename_to_api_level_map=codename_to_api_level_map)
 
-  data = signed.read()
+  data = None;
+  if is_compressed:
+    # Recompress the file after it has been signed.
+    compressed = tempfile.NamedTemporaryFile()
+    with open(signed.name, "rb") as in_file, gzip.open(compressed.name, "wb") as out_file:
+      shutil.copyfileobj(in_file, out_file)
+
+    data = compressed.read()
+    compressed.close()
+  else:
+    data = signed.read()
+
   unsigned.close()
   signed.close()
 
@@ -195,11 +226,17 @@
 
 def ProcessTargetFiles(input_tf_zip, output_tf_zip, misc_info,
                        apk_key_map, key_passwords, platform_api_level,
-                       codename_to_api_level_map):
+                       codename_to_api_level_map,
+                       compressed_extension):
+
+  compressed_apk_extension = None
+  if compressed_extension:
+    compressed_apk_extension = ".apk" + compressed_extension
 
   maxsize = max([len(os.path.basename(i.filename))
                  for i in input_tf_zip.infolist()
-                 if i.filename.endswith('.apk')])
+                 if i.filename.endswith('.apk') or
+                 (compressed_apk_extension and i.filename.endswith(compressed_apk_extension))])
   system_root_image = misc_info.get("system_root_image") == "true"
 
   for info in input_tf_zip.infolist():
@@ -210,13 +247,18 @@
     out_info = copy.copy(info)
 
     # Sign APKs.
-    if info.filename.endswith(".apk"):
+    if (info.filename.endswith(".apk") or
+        (compressed_apk_extension and info.filename.endswith(compressed_apk_extension))):
+      is_compressed = compressed_extension and info.filename.endswith(compressed_apk_extension)
       name = os.path.basename(info.filename)
+      if is_compressed:
+        name = name[:-len(compressed_extension)]
+
       key = apk_key_map[name]
       if key not in common.SPECIAL_CERT_STRINGS:
         print "    signing: %-*s (%s)" % (maxsize, name, key)
         signed_data = SignApk(data, key, key_passwords[key], platform_api_level,
-            codename_to_api_level_map)
+            codename_to_api_level_map, is_compressed)
         common.ZipWriteStr(output_tf_zip, out_info, signed_data)
       else:
         # an APK we're not supposed to sign.
@@ -748,8 +790,9 @@
 
   BuildKeyMap(misc_info, key_mapping_options)
 
-  apk_key_map = GetApkCerts(input_zip)
-  CheckAllApksSigned(input_zip, apk_key_map)
+  certmap, compressed_extension = common.ReadApkCerts(input_zip)
+  apk_key_map = GetApkCerts(certmap)
+  CheckAllApksSigned(input_zip, apk_key_map, compressed_extension)
 
   key_passwords = common.GetKeyPasswords(set(apk_key_map.values()))
   platform_api_level, _ = GetApiLevelAndCodename(input_zip)
@@ -758,7 +801,8 @@
   ProcessTargetFiles(input_zip, output_zip, misc_info,
                      apk_key_map, key_passwords,
                      platform_api_level,
-                     codename_to_api_level_map)
+                     codename_to_api_level_map,
+                     compressed_extension)
 
   common.ZipClose(input_zip)
   common.ZipClose(output_zip)