diff --git a/core/Makefile b/core/Makefile
index 9335fc5..df5c6b2 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1276,6 +1276,9 @@
 ifneq (true,$(TARGET_USERIMAGES_SPARSE_EXT_DISABLED))
   INTERNAL_USERIMAGES_SPARSE_EXT_FLAG := -s
 endif
+ifneq (true,$(TARGET_USERIMAGES_SPARSE_EROFS_DISABLED))
+  INTERNAL_USERIMAGES_SPARSE_EROFS_FLAG := -s
+endif
 ifneq (true,$(TARGET_USERIMAGES_SPARSE_SQUASHFS_DISABLED))
   INTERNAL_USERIMAGES_SPARSE_SQUASHFS_FLAG := -s
 endif
@@ -1300,6 +1303,18 @@
     $(BOARD_SYSTEMIMAGE_FILE_SYSTEM_TYPE) \
     $(BOARD_VENDOR_DLKMIMAGE_FILE_SYSTEM_TYPE) \
     $(BOARD_ODM_DLKMIMAGE_FILE_SYSTEM_TYPE) \
+  ,erofs),)
+INTERNAL_USERIMAGES_DEPS += $(MKEROFSUSERIMG)
+endif
+
+ifneq ($(filter \
+    $(BOARD_PRODUCTIMAGE_FILE_SYSTEM_TYPE) \
+    $(BOARD_SYSTEM_EXTIMAGE_FILE_SYSTEM_TYPE) \
+    $(BOARD_ODMIMAGE_FILE_SYSTEM_TYPE) \
+    $(BOARD_VENDORIMAGE_FILE_SYSTEM_TYPE) \
+    $(BOARD_SYSTEMIMAGE_FILE_SYSTEM_TYPE) \
+    $(BOARD_VENDOR_DLKMIMAGE_FILE_SYSTEM_TYPE) \
+    $(BOARD_ODM_DLKMIMAGE_FILE_SYSTEM_TYPE) \
   ,squashfs),)
 INTERNAL_USERIMAGES_DEPS += $(MKSQUASHFSUSERIMG)
 endif
@@ -1472,6 +1487,7 @@
 
 $(if $(INTERNAL_USERIMAGES_EXT_VARIANT),$(hide) echo "fs_type=$(INTERNAL_USERIMAGES_EXT_VARIANT)" >> $(1))
 $(if $(INTERNAL_USERIMAGES_SPARSE_EXT_FLAG),$(hide) echo "extfs_sparse_flag=$(INTERNAL_USERIMAGES_SPARSE_EXT_FLAG)" >> $(1))
+$(if $(INTERNAL_USERIMAGES_SPARSE_EROFS_FLAG),$(hide) echo "erofs_sparse_flag=$(INTERNAL_USERIMAGES_SPARSE_EROFS_FLAG)" >> $(1))
 $(if $(INTERNAL_USERIMAGES_SPARSE_SQUASHFS_FLAG),$(hide) echo "squashfs_sparse_flag=$(INTERNAL_USERIMAGES_SPARSE_SQUASHFS_FLAG)" >> $(1))
 $(if $(INTERNAL_USERIMAGES_SPARSE_F2FS_FLAG),$(hide) echo "f2fs_sparse_flag=$(INTERNAL_USERIMAGES_SPARSE_F2FS_FLAG)" >> $(1))
 $(if $(BOARD_EXT4_SHARE_DUP_BLOCKS),$(hide) echo "ext4_share_dup_blocks=$(BOARD_EXT4_SHARE_DUP_BLOCKS)" >> $(1))
@@ -3919,6 +3935,8 @@
   mkbootimg \
   mke2fs \
   mke2fs.conf \
+  mkfs.erofs \
+  mkerofsimage.sh \
   mkf2fsuserimg.sh \
   mksquashfs \
   mksquashfsimage.sh \
diff --git a/core/config.mk b/core/config.mk
index e975214..f860c43 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -555,6 +555,7 @@
 FS_GET_STATS := $(HOST_OUT_EXECUTABLES)/fs_get_stats$(HOST_EXECUTABLE_SUFFIX)
 MKEXTUSERIMG := $(HOST_OUT_EXECUTABLES)/mkuserimg_mke2fs
 MKE2FS_CONF := system/extras/ext4_utils/mke2fs.conf
+MKEROFSUSERIMG := $(HOST_OUT_EXECUTABLES)/mkerofsimage.sh
 MKSQUASHFSUSERIMG := $(HOST_OUT_EXECUTABLES)/mksquashfsimage.sh
 MKF2FSUSERIMG := $(HOST_OUT_EXECUTABLES)/mkf2fsuserimg.sh
 SIMG2IMG := $(HOST_OUT_EXECUTABLES)/simg2img$(HOST_EXECUTABLE_SUFFIX)
diff --git a/core/robolectric_test_config_template.xml b/core/robolectric_test_config_template.xml
index e79abd5..e62175f 100644
--- a/core/robolectric_test_config_template.xml
+++ b/core/robolectric_test_config_template.xml
@@ -15,8 +15,8 @@
 -->
 <!-- This test config file is auto-generated. -->
 <configuration description="Runs {MODULE}">
-    <option name="test-suite-tag" value="apct" />
-    <option name="test-suite-tag" value="apct-junit" />
+    <option name="test-suite-tag" value="robolectric" />
+    <option name="test-suite-tag" value="robolectric-tests" />
 
     <option name="java-folder" value="prebuilts/jdk/jdk9/linux-x86/" />
     <option name="exclude-paths" value="java" />
diff --git a/core/soong_config.mk b/core/soong_config.mk
index c221c55..809a4d6 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -42,6 +42,7 @@
 $(call add_json_bool, Unbundled_build,                   $(TARGET_BUILD_UNBUNDLED))
 $(call add_json_bool, Unbundled_build_apps,              $(TARGET_BUILD_APPS))
 $(call add_json_bool, Always_use_prebuilt_sdks,          $(TARGET_BUILD_USE_PREBUILT_SDKS))
+$(call add_json_bool, Skip_boot_jars_check,              $(SKIP_BOOT_JARS_CHECK))
 
 $(call add_json_bool, Debuggable,                        $(filter userdebug eng,$(TARGET_BUILD_VARIANT)))
 $(call add_json_bool, Eng,                               $(filter eng,$(TARGET_BUILD_VARIANT)))
diff --git a/core/tasks/boot_jars_package_check.mk b/core/tasks/boot_jars_package_check.mk
deleted file mode 100644
index baa378a..0000000
--- a/core/tasks/boot_jars_package_check.mk
+++ /dev/null
@@ -1,61 +0,0 @@
-# Copyright (C) 2014 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.
-
-#
-# Rules to check if classes in the boot jars are from the list of allowed packages.
-#
-
-ifneq ($(SKIP_BOOT_JARS_CHECK),true)
-ifdef PRODUCT_BOOT_JARS
-
-intermediates := $(call intermediates-dir-for, PACKAGING, boot-jars-package-check,,COMMON)
-stamp := $(intermediates)/stamp
-
-# Convert the colon-separated components <apex>:<jar> to <jar>.<apex> names
-# (e.g. com.android.media:updatable-media -> updatable-media.com.android.media).
-# Special cases:
-#   - for the "platform" or "system_ext" apex drop the .<apex> suffix
-boot_jars := $(foreach pair,$(PRODUCT_BOOT_JARS) $(PRODUCT_UPDATABLE_BOOT_JARS), \
-  $(eval apex := $(call word-colon,1,$(pair))) \
-  $(eval jar := $(call word-colon,2,$(pair))) \
-  $(eval q := :) \
-  $(eval sfx := $(q).$(apex)$(q)) \
-  $(eval sfx := $(subst $(q).platform$(q),$(q)$(q),$(sfx))) \
-  $(eval sfx := $(subst $(q).system_ext$(q),$(q)$(q),$(sfx))) \
-  $(eval sfx := $(patsubst $(q)%$(q),%,$(sfx))) \
-  $(jar)$(sfx))
-
-# Convert boot jar names to build paths.
-built_boot_jars := $(foreach j, $(boot_jars), \
-  $(call intermediates-dir-for, JAVA_LIBRARIES, $(j),,COMMON)/classes.jar)
-
-script := build/make/core/tasks/check_boot_jars/check_boot_jars.py
-allowed_file := build/make/core/tasks/check_boot_jars/package_allowed_list.txt
-
-$(stamp): PRIVATE_BOOT_JARS := $(built_boot_jars)
-$(stamp): PRIVATE_SCRIPT := $(script)
-$(stamp): PRIVATE_ALLOWED := $(allowed_file)
-$(stamp) : $(built_boot_jars) $(script) $(allowed_file)
-	@echo "Check package name for $(PRIVATE_BOOT_JARS)"
-	$(hide) $(PRIVATE_SCRIPT) $(PRIVATE_ALLOWED) $(PRIVATE_BOOT_JARS)
-	$(hide) mkdir -p $(dir $@) && touch $@
-
-.PHONY: check-boot-jars
-check-boot-jars : $(stamp)
-
-# Run check-boot-jars by default
-droidcore : check-boot-jars
-
-endif  # PRODUCT_BOOT_JARS
-endif  # SKIP_BOOT_JARS_CHECK not true
diff --git a/core/tasks/check_boot_jars/check_boot_jars.py b/core/tasks/check_boot_jars/check_boot_jars.py
deleted file mode 100755
index cf4ef27..0000000
--- a/core/tasks/check_boot_jars/check_boot_jars.py
+++ /dev/null
@@ -1,89 +0,0 @@
-#!/usr/bin/env python
-
-"""
-Check boot jars.
-
-Usage: check_boot_jars.py <package_allow_list_file> <jar1> <jar2> ...
-"""
-import logging
-import os.path
-import re
-import subprocess
-import sys
-
-
-# The compiled allow list RE.
-allow_list_re = None
-
-
-def LoadAllowList(filename):
-  """ Load and compile allow list regular expressions from filename.
-  """
-  lines = []
-  with open(filename, 'r') as f:
-    for line in f:
-      line = line.strip()
-      if not line or line.startswith('#'):
-        continue
-      lines.append(line)
-  combined_re = r'^(%s)$' % '|'.join(lines)
-  global allow_list_re
-  try:
-    allow_list_re = re.compile(combined_re)
-  except re.error:
-    logging.exception(
-        'Cannot compile package allow list regular expression: %r',
-        combined_re)
-    allow_list_re = None
-    return False
-  return True
-
-
-def CheckJar(allow_list_path, jar):
-  """Check a jar file.
-  """
-  # Get the list of files inside the jar file.
-  p = subprocess.Popen(args='jar tf %s' % jar,
-      stdout=subprocess.PIPE, shell=True)
-  stdout, _ = p.communicate()
-  if p.returncode != 0:
-    return False
-  items = stdout.split()
-  classes = 0
-  for f in items:
-    if f.endswith('.class'):
-      classes += 1
-      package_name = os.path.dirname(f)
-      package_name = package_name.replace('/', '.')
-      if not package_name or not allow_list_re.match(package_name):
-        print >> sys.stderr, ('Error: %s contains class file %s, whose package name %s is empty or'
-                              ' not in the allow list %s of packages allowed on the bootclasspath.'
-                              % (jar, f, package_name, allow_list_path))
-        return False
-  if classes == 0:
-    print >> sys.stderr, ('Error: %s does not contain any class files.' % jar)
-    return False
-  return True
-
-
-def main(argv):
-  if len(argv) < 2:
-    print __doc__
-    return 1
-  allow_list_path = argv[0]
-
-  if not LoadAllowList(allow_list_path):
-    return 1
-
-  passed = True
-  for jar in argv[1:]:
-    if not CheckJar(allow_list_path, jar):
-      passed = False
-  if not passed:
-    return 1
-
-  return 0
-
-
-if __name__ == '__main__':
-  sys.exit(main(sys.argv[1:]))
diff --git a/core/tasks/check_boot_jars/package_allowed_list.txt b/core/tasks/check_boot_jars/package_allowed_list.txt
deleted file mode 100644
index 18ab427..0000000
--- a/core/tasks/check_boot_jars/package_allowed_list.txt
+++ /dev/null
@@ -1,248 +0,0 @@
-# Boot jar package name allowed list.
-# Each line is interpreted as a regular expression.
-
-###################################################
-# core-libart.jar & core-oj.jar
-java\.awt\.font
-java\.beans
-java\.io
-java\.lang
-java\.lang\.annotation
-java\.lang\.invoke
-java\.lang\.ref
-java\.lang\.reflect
-java\.math
-java\.net
-java\.nio
-java\.nio\.file
-java\.nio\.file\.spi
-java\.nio\.file\.attribute
-java\.nio\.channels
-java\.nio\.channels\.spi
-java\.nio\.charset
-java\.nio\.charset\.spi
-java\.security
-java\.security\.acl
-java\.security\.cert
-java\.security\.interfaces
-java\.security\.spec
-java\.sql
-java\.text
-java\.text\.spi
-java\.time
-java\.time\.chrono
-java\.time\.format
-java\.time\.temporal
-java\.time\.zone
-java\.util
-java\.util\.concurrent
-java\.util\.concurrent\.atomic
-java\.util\.concurrent\.locks
-java\.util\.function
-java\.util\.jar
-java\.util\.logging
-java\.util\.prefs
-java\.util\.regex
-java\.util\.spi
-java\.util\.stream
-java\.util\.zip
-# TODO: Remove javax.annotation.processing if possible, see http://b/132338110:
-javax\.annotation\.processing
-javax\.crypto
-javax\.crypto\.interfaces
-javax\.crypto\.spec
-javax\.net
-javax\.net\.ssl
-javax\.security\.auth
-javax\.security\.auth\.callback
-javax\.security\.auth\.login
-javax\.security\.auth\.x500
-javax\.security\.cert
-javax\.sql
-javax\.xml
-javax\.xml\.datatype
-javax\.xml\.namespace
-javax\.xml\.parsers
-javax\.xml\.transform
-javax\.xml\.transform\.dom
-javax\.xml\.transform\.sax
-javax\.xml\.transform\.stream
-javax\.xml\.validation
-javax\.xml\.xpath
-jdk\.internal\.util
-jdk\.internal\.vm\.annotation
-jdk\.net
-org\.w3c\.dom
-org\.w3c\.dom\.ls
-org\.w3c\.dom\.traversal
-# OpenJdk internal implementation.
-sun\.invoke\.util
-sun\.invoke\.empty
-sun\.misc
-sun\.util.*
-sun\.text.*
-sun\.security.*
-sun\.reflect.*
-sun\.nio.*
-sun\.net.*
-com\.sun\..*
-
-# TODO: Move these internal org.apache.harmony classes to libcore.*
-org\.apache\.harmony\.crypto\.internal
-org\.apache\.harmony\.dalvik
-org\.apache\.harmony\.dalvik\.ddmc
-org\.apache\.harmony\.luni\.internal\.util
-org\.apache\.harmony\.security
-org\.apache\.harmony\.security\.asn1
-org\.apache\.harmony\.security\.fortress
-org\.apache\.harmony\.security\.pkcs10
-org\.apache\.harmony\.security\.pkcs7
-org\.apache\.harmony\.security\.pkcs8
-org\.apache\.harmony\.security\.provider\.crypto
-org\.apache\.harmony\.security\.utils
-org\.apache\.harmony\.security\.x501
-org\.apache\.harmony\.security\.x509
-org\.apache\.harmony\.security\.x509\.tsp
-org\.apache\.harmony\.xml
-org\.apache\.harmony\.xml\.dom
-org\.apache\.harmony\.xml\.parsers
-
-org\.json
-org\.xmlpull\.v1
-org\.xmlpull\.v1\.sax2
-
-# TODO:  jarjar org.kxml2.io to com.android org\.kxml2\.io
-org\.kxml2\.io
-org\.xml
-org\.xml\.sax
-org\.xml\.sax\.ext
-org\.xml\.sax\.helpers
-
-dalvik\..*
-libcore\..*
-android\..*
-com\.android\..*
-###################################################
-# android.test.base.jar
-junit\.extensions
-junit\.framework
-android\.test
-android\.test\.suitebuilder\.annotation
-
-
-###################################################
-# ext.jar
-# TODO: jarjar javax.sip to com.android
-javax\.sip
-javax\.sip\.address
-javax\.sip\.header
-javax\.sip\.message
-
-# TODO: jarjar org.apache.commons to com.android
-org\.apache\.commons\.codec
-org\.apache\.commons\.codec\.binary
-org\.apache\.commons\.codec\.language
-org\.apache\.commons\.codec\.net
-org\.apache\.commons\.logging
-org\.apache\.commons\.logging\.impl
-org\.apache\.http
-org\.apache\.http\.auth
-org\.apache\.http\.auth\.params
-org\.apache\.http\.client
-org\.apache\.http\.client\.entity
-org\.apache\.http\.client\.methods
-org\.apache\.http\.client\.params
-org\.apache\.http\.client\.protocol
-org\.apache\.http\.client\.utils
-org\.apache\.http\.conn
-org\.apache\.http\.conn\.params
-org\.apache\.http\.conn\.routing
-org\.apache\.http\.conn\.scheme
-org\.apache\.http\.conn\.ssl
-org\.apache\.http\.conn\.util
-org\.apache\.http\.cookie
-org\.apache\.http\.cookie\.params
-org\.apache\.http\.entity
-org\.apache\.http\.impl
-org\.apache\.http\.impl\.auth
-org\.apache\.http\.impl\.client
-org\.apache\.http\.impl\.client
-org\.apache\.http\.impl\.conn
-org\.apache\.http\.impl\.conn\.tsccm
-org\.apache\.http\.impl\.cookie
-org\.apache\.http\.impl\.entity
-org\.apache\.http\.impl\.io
-org\.apache\.http\.impl\.io
-org\.apache\.http\.io
-org\.apache\.http\.message
-org\.apache\.http\.params
-org\.apache\.http\.protocol
-org\.apache\.http\.util
-
-# TODO: jarjar gov.nist to com.android
-gov\.nist\.core
-gov\.nist\.core\.net
-gov\.nist\.javax\.sip
-gov\.nist\.javax\.sip\.address
-gov\.nist\.javax\.sip\.clientauthutils
-gov\.nist\.javax\.sip\.header
-gov\.nist\.javax\.sip\.header\.extensions
-gov\.nist\.javax\.sip\.header\.ims
-gov\.nist\.javax\.sip\.message
-gov\.nist\.javax\.sip\.parser
-gov\.nist\.javax\.sip\.parser\.extensions
-gov\.nist\.javax\.sip\.parser\.ims
-gov\.nist\.javax\.sip\.stack
-
-org\.ccil\.cowan\.tagsoup
-org\.ccil\.cowan\.tagsoup\.jaxp
-
-###################################################
-# framework.jar
-javax\.microedition\.khronos\.opengles
-javax\.microedition\.khronos\.egl
-
-android
-
-###################################################
-# apache-xml.jar
-org\.apache\.xml\.res
-org\.apache\.xml\.utils
-org\.apache\.xml\.utils\.res
-org\.apache\.xml\.dtm
-org\.apache\.xml\.dtm\.ref
-org\.apache\.xml\.dtm\.ref\.dom2dtm
-org\.apache\.xml\.dtm\.ref\.sax2dtm
-org\.apache\.xml\.serializer
-org\.apache\.xml\.serializer\.utils
-org\.apache\.xml\.serializer\.dom3
-org\.apache\.xpath
-org\.apache\.xpath\.operations
-org\.apache\.xpath\.domapi
-org\.apache\.xpath\.functions
-org\.apache\.xpath\.res
-org\.apache\.xpath\.axes
-org\.apache\.xpath\.objects
-org\.apache\.xpath\.patterns
-org\.apache\.xpath\.jaxp
-org\.apache\.xpath\.compiler
-org\.apache\.xalan
-org\.apache\.xalan\.res
-org\.apache\.xalan\.templates
-org\.apache\.xalan\.serialize
-org\.apache\.xalan\.extensions
-org\.apache\.xalan\.processor
-org\.apache\.xalan\.transformer
-org\.apache\.xalan\.xslt
-
-###################################################
-# Packages in the google namespace across all bootclasspath jars.
-com\.google\.android\..*
-com\.google\.vr\.platform.*
-com\.google\.i18n\.phonenumbers\..*
-com\.google\.i18n\.phonenumbers
-
-###################################################
-# Packages used for Android in Chrome OS
-org\.chromium\.arc
-org\.chromium\.arc\..*
diff --git a/tools/releasetools/Android.bp b/tools/releasetools/Android.bp
index e1543e7..ca6c2b2 100644
--- a/tools/releasetools/Android.bp
+++ b/tools/releasetools/Android.bp
@@ -49,6 +49,7 @@
     required: [
         "blk_alloc_to_base_fs",
         "e2fsck",
+        "mkerofsimage.sh",
         "mkuserimg_mke2fs",
         "simg2img",
         "tune2fs",
diff --git a/tools/releasetools/build_image.py b/tools/releasetools/build_image.py
index 169a112..6487b9b 100755
--- a/tools/releasetools/build_image.py
+++ b/tools/releasetools/build_image.py
@@ -296,6 +296,18 @@
       build_command.extend(["--inode_size", "256"])
     if "selinux_fc" in prop_dict:
       build_command.append(prop_dict["selinux_fc"])
+  elif fs_type.startswith("erofs"):
+    build_command = ["mkerofsimage.sh"]
+    build_command.extend([in_dir, out_file])
+    if "erofs_sparse_flag" in prop_dict:
+      build_command.extend([prop_dict["erofs_sparse_flag"]])
+    build_command.extend(["-m", prop_dict["mount_point"]])
+    if target_out:
+      build_command.extend(["-d", target_out])
+    if fs_config:
+      build_command.extend(["-C", fs_config])
+    if "selinux_fc" in prop_dict:
+      build_command.extend(["-c", prop_dict["selinux_fc"]])
   elif fs_type.startswith("squash"):
     build_command = ["mksquashfsimage.sh"]
     build_command.extend([in_dir, out_file])
@@ -532,6 +544,7 @@
 
   common_props = (
       "extfs_sparse_flag",
+      "erofs_sparse_flag",
       "squashfs_sparse_flag",
       "f2fs_sparse_flag",
       "skip_fsck",