diff --git a/core/Makefile b/core/Makefile
index 6809d24..e2d096d 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -863,7 +863,7 @@
 # -----------------------------------------------------------------
 # Cert-to-package mapping.  Used by the post-build signing tools.
 # Use a macro to add newline to each echo command
-# $1 package name
+# $1 stem name of the package
 # $2 certificate
 # $3 private key
 # $4 compressed
@@ -893,8 +893,8 @@
 	@rm -f $@
 	$(foreach p,$(sort $(PACKAGES)),\
 	  $(if $(PACKAGES.$(p).EXTERNAL_KEY),\
-	    $(call _apkcerts_write_line,$(p),"EXTERNAL","",$(PACKAGES.$(p).COMPRESSED),$(PACKAGES.$(p).PARTITION),$@),\
-	    $(call _apkcerts_write_line,$(p),$(PACKAGES.$(p).CERTIFICATE),$(PACKAGES.$(p).PRIVATE_KEY),$(PACKAGES.$(p).COMPRESSED),$(PACKAGES.$(p).PARTITION),$@)))
+	    $(call _apkcerts_write_line,$(PACKAGES.$(p).STEM),"EXTERNAL","",$(PACKAGES.$(p).COMPRESSED),$(PACKAGES.$(p).PARTITION),$@),\
+	    $(call _apkcerts_write_line,$(PACKAGES.$(p).STEM),$(PACKAGES.$(p).CERTIFICATE),$(PACKAGES.$(p).PRIVATE_KEY),$(PACKAGES.$(p).COMPRESSED),$(PACKAGES.$(p).PARTITION),$@)))
 	# In case value of PACKAGES is empty.
 	$(hide) touch $@
 
@@ -2712,10 +2712,10 @@
 endif # INSTALLED_RECOVERYIMAGE_TARGET
 endif # INSTALLED_BOOTIMAGE_TARGET
 
-$(INSTALLED_SYSTEMIMAGE_TARGET): $(BUILT_SYSTEMIMAGE) $(RECOVERY_FROM_BOOT_PATCH)
+$(INSTALLED_SYSTEMIMAGE_TARGET): $(BUILT_SYSTEMIMAGE)
 	@echo "Install system fs image: $@"
 	$(copy-file-to-target)
-	$(hide) $(call assert-max-image-size,$@ $(RECOVERY_FROM_BOOT_PATCH),$(BOARD_SYSTEMIMAGE_PARTITION_SIZE))
+	$(hide) $(call assert-max-image-size,$@,$(BOARD_SYSTEMIMAGE_PARTITION_SIZE))
 
 systemimage: $(INSTALLED_SYSTEMIMAGE_TARGET)
 
@@ -3080,7 +3080,7 @@
       $(BUILD_IMAGE) \
           $(TARGET_OUT_VENDOR) $(vendorimage_intermediates)/vendor_image_info.txt \
           $(INSTALLED_VENDORIMAGE_TARGET) $(TARGET_OUT)
-  $(call assert-max-image-size,$(INSTALLED_VENDORIMAGE_TARGET),$(BOARD_VENDORIMAGE_PARTITION_SIZE))
+  $(call assert-max-image-size,$(INSTALLED_VENDORIMAGE_TARGET) $(RECOVERY_FROM_BOOT_PATCH),$(BOARD_VENDORIMAGE_PARTITION_SIZE))
 endef
 
 # We just build this directly to the install location.
@@ -3088,7 +3088,8 @@
 $(INSTALLED_VENDORIMAGE_TARGET): \
     $(INTERNAL_USERIMAGES_DEPS) \
     $(INTERNAL_VENDORIMAGE_FILES) \
-    $(INSTALLED_FILES_FILE_VENDOR)
+    $(INSTALLED_FILES_FILE_VENDOR) \
+    $(RECOVERY_FROM_BOOT_PATCH)
 	$(build-vendorimage-target)
 
 .PHONY: vendorimage-nodeps vnod
@@ -5155,6 +5156,20 @@
 vendorimage: $(INSTALLED_QEMU_VENDORIMAGE)
 droidcore: $(INSTALLED_QEMU_VENDORIMAGE)
 endif
+
+ifdef INSTALLED_RAMDISK_TARGET
+ifdef INSTALLED_VENDOR_BOOTIMAGE_TARGET
+ifdef INTERNAL_VENDOR_RAMDISK_TARGET
+INSTALLED_QEMU_RAMDISKIMAGE := $(PRODUCT_OUT)/ramdisk-qemu.img
+$(INSTALLED_QEMU_RAMDISKIMAGE): $(INTERNAL_VENDOR_RAMDISK_TARGET) $(INSTALLED_RAMDISK_TARGET)
+	@echo Create ramdisk-qemu.img
+	(cat $(INSTALLED_RAMDISK_TARGET) $(INTERNAL_VENDOR_RAMDISK_TARGET) > $(INSTALLED_QEMU_RAMDISKIMAGE))
+
+droidcore: $(INSTALLED_QEMU_RAMDISKIMAGE)
+endif
+endif
+endif
+
 ifdef INSTALLED_PRODUCTIMAGE_TARGET
 INSTALLED_QEMU_PRODUCTIMAGE := $(PRODUCT_OUT)/product-qemu.img
 $(INSTALLED_QEMU_PRODUCTIMAGE): $(INSTALLED_PRODUCTIMAGE_TARGET) $(MK_QEMU_IMAGE_SH) $(SGDISK_HOST) $(SIMG2IMG)
@@ -5292,6 +5307,7 @@
 	$(APPCOMPAT_ZIP) \
 	$(INSTALLED_SYSTEMIMAGE_TARGET) \
 	$(INSTALLED_QEMU_SYSTEMIMAGE) \
+	$(INSTALLED_QEMU_RAMDISKIMAGE) \
 	$(INSTALLED_QEMU_VENDORIMAGE) \
 	$(QEMU_VERIFIED_BOOT_PARAMS) \
 	$(INSTALLED_USERDATAIMAGE_TARGET) \
diff --git a/core/local_systemsdk.mk b/core/local_systemsdk.mk
index 2b73f93..460073d 100644
--- a/core/local_systemsdk.mk
+++ b/core/local_systemsdk.mk
@@ -15,7 +15,7 @@
 #
 
 ifdef BOARD_SYSTEMSDK_VERSIONS
-  # Apps and jars in vendor or odm partition are forced to build against System SDK.
+  # Apps and jars in vendor, product or odm partition are forced to build against System SDK.
   _cannot_use_platform_apis :=
   ifneq (,$(filter true,$(LOCAL_VENDOR_MODULE) $(LOCAL_ODM_MODULE) $(LOCAL_PROPRIETARY_MODULE)))
     # Note: no need to check LOCAL_MODULE_PATH* since LOCAL_[VENDOR|ODM|OEM]_MODULE is already
@@ -29,9 +29,9 @@
   ifneq (,$(filter JAVA_LIBRARIES APPS,$(LOCAL_MODULE_CLASS)))
     ifndef LOCAL_SDK_VERSION
       ifeq ($(_cannot_use_platform_apis),true)
-        ifeq (,$(findstring __auto_generated_rro_,$(LOCAL_MODULE)))
+        ifeq (,$(LOCAL_IS_RUNTIME_RESOURCE_OVERLAY))
           # Runtime resource overlays are exempted from building against System SDK.
-          # TODO(b/35859726): remove this exception
+          # TODO(b/155027019): remove this, after no product/vendor apps rely on this behavior.
           LOCAL_SDK_VERSION := system_current
         endif
       endif
diff --git a/core/main.mk b/core/main.mk
index 9d2b7cb..f8b06b9 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -1173,13 +1173,13 @@
   # Verify the artifact path requirements made by included products.
   is_asan := $(if $(filter address,$(SANITIZE_TARGET)),true)
   ifneq (true,$(or $(is_asan),$(DISABLE_ARTIFACT_PATH_REQUIREMENTS)))
-  # Fakes don't get installed, host files are irrelevant, and NDK stubs aren't installed to device.
-  static_whitelist_patterns := $(TARGET_OUT_FAKE)/% $(HOST_OUT)/% $(SOONG_OUT_DIR)/ndk/%
+  # Fakes don't get installed, and NDK stubs aren't installed to device.
+  static_whitelist_patterns := $(TARGET_OUT_FAKE)/% $(SOONG_OUT_DIR)/ndk/%
   # RROs become REQUIRED by the source module, but are always placed on the vendor partition.
   static_whitelist_patterns += %__auto_generated_rro_product.apk
   static_whitelist_patterns += %__auto_generated_rro_vendor.apk
   # Auto-included targets are not considered
-  static_whitelist_patterns += $(call module-installed-files,$(call auto-included-modules))
+  static_whitelist_patterns += $(call product-installed-files,)
   # $(PRODUCT_OUT)/apex is where shared libraries in APEXes get installed.
   # The path can be considered as a fake path, as the shared libraries
   # are installed there just to have symbols files for them under
diff --git a/core/soong_app_prebuilt.mk b/core/soong_app_prebuilt.mk
index 6dc396c..a3de688 100644
--- a/core/soong_app_prebuilt.mk
+++ b/core/soong_app_prebuilt.mk
@@ -157,6 +157,12 @@
 include $(BUILD_SYSTEM)/app_certificate_validate.mk
 PACKAGES.$(LOCAL_MODULE).OVERRIDES := $(strip $(LOCAL_OVERRIDES_PACKAGES))
 
+ifneq ($(LOCAL_MODULE_STEM),)
+  PACKAGES.$(LOCAL_MODULE).STEM := $(LOCAL_MODULE_STEM)
+else
+  PACKAGES.$(LOCAL_MODULE).STEM := $(LOCAL_MODULE)
+endif
+
 # Set a actual_partition_tag (calculated in base_rules.mk) for the package.
 PACKAGES.$(LOCAL_MODULE).PARTITION := $(actual_partition_tag)
 
diff --git a/core/soong_cc_prebuilt.mk b/core/soong_cc_prebuilt.mk
index 190a7ed..7853890 100644
--- a/core/soong_cc_prebuilt.mk
+++ b/core/soong_cc_prebuilt.mk
@@ -128,10 +128,11 @@
   $(same_vndk_variants_stamp): PRIVATE_TOOLS_PREFIX := $($(LOCAL_2ND_ARCH_VAR_PREFIX)$(my_prefix)TOOLS_PREFIX)
 
   $(same_vndk_variants_stamp): $(my_core_shared_lib) $(LOCAL_PREBUILT_MODULE_FILE)
-		$(call verify-vndk-libs-identical,\
-		    $(PRIVATE_CORE_VARIANT),\
-		    $(PRIVATE_VENDOR_VARIANT),\
-		    $(PRIVATE_TOOLS_PREFIX))
+	$(call verify-vndk-libs-identical,\
+	    $(PRIVATE_CORE_VARIANT),\
+	    $(PRIVATE_VENDOR_VARIANT),\
+	    $(PRIVATE_TOOLS_PREFIX))
+	touch $@
 
   $(LOCAL_BUILT_MODULE): $(same_vndk_variants_stamp)
 endif
diff --git a/core/tasks/sdk-addon.mk b/core/tasks/sdk-addon.mk
index 7f777a5..5097f12 100644
--- a/core/tasks/sdk-addon.mk
+++ b/core/tasks/sdk-addon.mk
@@ -66,7 +66,7 @@
 files_to_copy += \
 	$(addon_dir_img):$(INSTALLED_QEMU_SYSTEMIMAGE):images/$(TARGET_CPU_ABI)/system.img \
 	$(addon_dir_img):$(INSTALLED_QEMU_VENDORIMAGE):images/$(TARGET_CPU_ABI)/vendor.img \
-	$(addon_dir_img):$(BUILT_RAMDISK_TARGET):images/$(TARGET_CPU_ABI)/ramdisk.img \
+	$(addon_dir_img):$(INSTALLED_QEMU_RAMDISKIMAGE):images/$(TARGET_CPU_ABI)/ramdisk.img \
 	$(addon_dir_img):$(PRODUCT_OUT)/system/build.prop:images/$(TARGET_CPU_ABI)/build.prop \
 	$(addon_dir_img):device/generic/goldfish/data/etc/userdata.img:images/$(TARGET_CPU_ABI)/userdata.img \
 	$(addon_dir_img):$(target_notice_file_txt):images/$(TARGET_CPU_ABI)/NOTICE.txt \
diff --git a/core/tasks/vts-core-tests.mk b/core/tasks/vts-core-tests.mk
index 08663c2..4e83de5 100644
--- a/core/tasks/vts-core-tests.mk
+++ b/core/tasks/vts-core-tests.mk
@@ -21,8 +21,28 @@
 # Some repo may not include vts project.
 -include test/vts/tools/build/tasks/framework/vts_for_core_suite.mk
 
+# Copy kernel test modules to testcases directories
+kernel_test_host_out := $(HOST_OUT_TESTCASES)/vts_kernel_tests
+kernel_test_vts_out := $(HOST_OUT)/$(test_suite_name)/android-$(test_suite_name)/testcases/vts_kernel_tests
+kernel_test_modules := \
+    $(kselftest_modules) \
+    ltp \
+    $(ltp_packages)
+
+kernel_test_copy_pairs := \
+  $(call target-native-copy-pairs,$(kernel_test_modules),$(kernel_test_vts_out)) \
+  $(call target-native-copy-pairs,$(kernel_test_modules),$(kernel_test_host_out))
+
+copy_kernel_tests := $(call copy-many-files,$(kernel_test_copy_pairs))
+
+# PHONY target to be used to build and test `vts_kernel_tests` without building full vts
+.PHONY: vts_kernel_tests
+vts_kernel_tests: $(copy_kernel_tests)
+
 include $(BUILD_SYSTEM)/tasks/tools/compatibility.mk
 
+$(compatibility_zip): $(copy_kernel_tests)
+
 .PHONY: vts
 $(compatibility_zip): $(vts_test_artifact_paths)
 vts: $(compatibility_zip)
diff --git a/target/board/BoardConfigEmuCommon.mk b/target/board/BoardConfigEmuCommon.mk
index d11f9d2..a2e5518 100644
--- a/target/board/BoardConfigEmuCommon.mk
+++ b/target/board/BoardConfigEmuCommon.mk
@@ -74,6 +74,13 @@
   BOARD_VENDORIMAGE_PARTITION_SIZE := 146800640
 endif
 
+#vendor boot
+TARGET_NO_VENDOR_BOOT := false
+BOARD_INCLUDE_DTB_IN_BOOTIMG := false
+BOARD_BOOT_HEADER_VERSION := 3
+BOARD_MKBOOTIMG_ARGS += --header_version $(BOARD_BOOT_HEADER_VERSION)
+BOARD_VENDOR_BOOTIMAGE_PARTITION_SIZE := 0x06000000
+
 # Enable chain partition for system.
 BOARD_AVB_SYSTEM_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
 BOARD_AVB_SYSTEM_ALGORITHM := SHA256_RSA2048
diff --git a/target/board/generic_arm64/BoardConfig.mk b/target/board/generic_arm64/BoardConfig.mk
index 91d5692..d793c38 100644
--- a/target/board/generic_arm64/BoardConfig.mk
+++ b/target/board/generic_arm64/BoardConfig.mk
@@ -54,6 +54,8 @@
 
 include build/make/target/board/BoardConfigGsiCommon.mk
 
+BOARD_EXT4_SHARE_DUP_BLOCKS := true
+
 TARGET_NO_KERNEL := false
 TARGET_NO_VENDOR_BOOT := true
 BOARD_USES_RECOVERY_AS_BOOT := true
diff --git a/target/product/mainline_system.mk b/target/product/mainline_system.mk
index 814cb64..f8d85bf 100644
--- a/target/product/mainline_system.mk
+++ b/target/product/mainline_system.mk
@@ -120,9 +120,6 @@
 
 PRODUCT_ENFORCE_RRO_TARGETS := *
 
-# TODO(b/150820813) Settings depends on static overlay, remove this after eliminating the dependency.
-PRODUCT_ENFORCE_RRO_EXEMPTED_TARGETS := Settings
-
 PRODUCT_NAME := mainline_system
 PRODUCT_BRAND := generic
 
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index 536d47f..df57e37 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -335,8 +335,11 @@
   _RO_PRODUCT_RESOLVE_PROPS = ["ro.product.brand", "ro.product.device",
                                "ro.product.manufacturer", "ro.product.model",
                                "ro.product.name"]
-  _RO_PRODUCT_PROPS_DEFAULT_SOURCE_ORDER = ["product", "odm", "vendor",
-                                            "system_ext", "system"]
+  _RO_PRODUCT_PROPS_DEFAULT_SOURCE_ORDER_CURRENT = [
+      "product", "odm", "vendor", "system_ext", "system"]
+  _RO_PRODUCT_PROPS_DEFAULT_SOURCE_ORDER_ANDROID_10 = [
+      "product", "product_services", "odm", "vendor", "system"]
+  _RO_PRODUCT_PROPS_DEFAULT_SOURCE_ORDER_LEGACY = []
 
   def __init__(self, info_dict, oem_dicts=None):
     """Initializes a BuildInfo instance with the given dicts.
@@ -446,16 +449,16 @@
     if prop_val:
       return prop_val
 
+    default_source_order = self._GetRoProductPropsDefaultSourceOrder()
     source_order_val = self.info_dict.get("build.prop", {}).get(
         "ro.product.property_source_order")
     if source_order_val:
       source_order = source_order_val.split(",")
     else:
-      source_order = BuildInfo._RO_PRODUCT_PROPS_DEFAULT_SOURCE_ORDER
+      source_order = default_source_order
 
     # Check that all sources in ro.product.property_source_order are valid
-    if any([x not in BuildInfo._RO_PRODUCT_PROPS_DEFAULT_SOURCE_ORDER
-            for x in source_order]):
+    if any([x not in default_source_order for x in source_order]):
       raise ExternalError(
           "Invalid ro.product.property_source_order '{}'".format(source_order))
 
@@ -469,6 +472,27 @@
 
     raise ExternalError("couldn't resolve {}".format(prop))
 
+  def _GetRoProductPropsDefaultSourceOrder(self):
+    # NOTE: refer to CDDs and android.os.Build.VERSION for the definition and
+    # values of these properties for each Android release.
+    android_codename = self.info_dict.get("build.prop", {}).get(
+        "ro.build.version.codename")
+    if android_codename == "REL":
+      android_version = self.info_dict.get("build.prop", {}).get(
+          "ro.build.version.release")
+      if android_version == "10":
+        return BuildInfo._RO_PRODUCT_PROPS_DEFAULT_SOURCE_ORDER_ANDROID_10
+      # NOTE: float() conversion of android_version will have rounding error.
+      # We are checking for "9" or less, and using "< 10" is well outside of
+      # possible floating point rounding.
+      try:
+        android_version_val = float(android_version)
+      except ValueError:
+        android_version_val = 0
+      if android_version_val < 10:
+        return BuildInfo._RO_PRODUCT_PROPS_DEFAULT_SOURCE_ORDER_LEGACY
+    return BuildInfo._RO_PRODUCT_PROPS_DEFAULT_SOURCE_ORDER_CURRENT
+
   def GetOemProperty(self, key):
     if self.oem_props is not None and key in self.oem_props:
       return self.oem_dicts[0][key]
diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index 2126d11..92a46a2 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -318,7 +318,7 @@
     common.RunAndCheckOutput(cmd)
     with open(out_signature_size_file) as f:
       signature_size = f.read().rstrip()
-    logger.info("% outputs the maximum signature size: %", cmd[0],
+    logger.info("%s outputs the maximum signature size: %s", cmd[0],
                 signature_size)
     return int(signature_size)
 
diff --git a/tools/releasetools/test_common.py b/tools/releasetools/test_common.py
index 7ba0d1a..029d46f 100644
--- a/tools/releasetools/test_common.py
+++ b/tools/releasetools/test_common.py
@@ -107,6 +107,51 @@
       },
   ]
 
+  TEST_INFO_DICT_PROPERTY_SOURCE_ORDER = {
+      'build.prop' : {
+          'ro.build.fingerprint' : 'build-fingerprint',
+          'ro.product.property_source_order' :
+              'product,odm,vendor,system_ext,system',
+      },
+      'system.build.prop' : {
+          'ro.product.system.device' : 'system-product-device',
+      },
+      'vendor.build.prop' : {
+          'ro.product.vendor.device' : 'vendor-product-device',
+      },
+  }
+
+  TEST_INFO_DICT_PROPERTY_SOURCE_ORDER_ANDROID_10 = {
+      'build.prop' : {
+          'ro.build.fingerprint' : 'build-fingerprint',
+          'ro.product.property_source_order' :
+              'product,product_services,odm,vendor,system',
+          'ro.build.version.release' : '10',
+          'ro.build.version.codename' : 'REL',
+      },
+      'system.build.prop' : {
+          'ro.product.system.device' : 'system-product-device',
+      },
+      'vendor.build.prop' : {
+          'ro.product.vendor.device' : 'vendor-product-device',
+      },
+  }
+
+  TEST_INFO_DICT_PROPERTY_SOURCE_ORDER_ANDROID_9 = {
+      'build.prop' : {
+          'ro.product.device' : 'product-device',
+          'ro.build.fingerprint' : 'build-fingerprint',
+          'ro.build.version.release' : '9',
+          'ro.build.version.codename' : 'REL',
+      },
+      'system.build.prop' : {
+          'ro.product.system.device' : 'system-product-device',
+      },
+      'vendor.build.prop' : {
+          'ro.product.vendor.device' : 'vendor-product-device',
+      },
+  }
+
   def test_init(self):
     target_info = common.BuildInfo(self.TEST_INFO_DICT, None)
     self.assertEqual('product-device', target_info.device)
@@ -253,6 +298,41 @@
         ],
         script_writer.lines)
 
+  def test_ResolveRoProductProperty_FromVendor(self):
+    info_dict = copy.deepcopy(self.TEST_INFO_DICT_PROPERTY_SOURCE_ORDER)
+    info = common.BuildInfo(info_dict, None)
+    self.assertEqual('vendor-product-device',
+                     info.GetBuildProp('ro.product.device'))
+
+  def test_ResolveRoProductProperty_FromSystem(self):
+    info_dict = copy.deepcopy(self.TEST_INFO_DICT_PROPERTY_SOURCE_ORDER)
+    del info_dict['vendor.build.prop']['ro.product.vendor.device']
+    info = common.BuildInfo(info_dict, None)
+    self.assertEqual('system-product-device',
+                     info.GetBuildProp('ro.product.device'))
+
+  def test_ResolveRoProductProperty_InvalidPropertySearchOrder(self):
+    info_dict = copy.deepcopy(self.TEST_INFO_DICT_PROPERTY_SOURCE_ORDER)
+    info_dict['build.prop']['ro.product.property_source_order'] = 'bad-source'
+    with self.assertRaisesRegexp(common.ExternalError,
+        'Invalid ro.product.property_source_order'):
+      info = common.BuildInfo(info_dict, None)
+      info.GetBuildProp('ro.product.device')
+
+  def test_ResolveRoProductProperty_Android10PropertySearchOrder(self):
+    info_dict = copy.deepcopy(
+        self.TEST_INFO_DICT_PROPERTY_SOURCE_ORDER_ANDROID_10)
+    info = common.BuildInfo(info_dict, None)
+    self.assertEqual('vendor-product-device',
+                     info.GetBuildProp('ro.product.device'))
+
+  def test_ResolveRoProductProperty_Android9PropertySearchOrder(self):
+    info_dict = copy.deepcopy(
+        self.TEST_INFO_DICT_PROPERTY_SOURCE_ORDER_ANDROID_9)
+    info = common.BuildInfo(info_dict, None)
+    self.assertEqual('product-device',
+                     info.GetBuildProp('ro.product.device'))
+
 
 class CommonZipTest(test_utils.ReleaseToolsTestCase):