diff --git a/core/Makefile b/core/Makefile
index a0cc1fb..6809d24 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -2080,8 +2080,7 @@
 	$(call append-recovery-ui-properties,$(PRIVATE_RECOVERY_UI_PROPERTIES),$@)
 
 ifeq (truetrue,$(strip $(BUILDING_VENDOR_BOOT_IMAGE))$(strip $(AB_OTA_UPDATER)))
-  INTERNAL_RECOVERYIMAGE_ARGS := \
-      --kernel $(recovery_kernel) --ramdisk $(recovery_ramdisk)
+  INTERNAL_RECOVERYIMAGE_ARGS := --ramdisk $(recovery_ramdisk)
 ifdef GENERIC_KERNEL_CMDLINE
   INTERNAL_RECOVERYIMAGE_ARGS += --cmdline "$(GENERIC_KERNEL_CMDLINE)"
 endif
@@ -2158,10 +2157,10 @@
 # $(2): kernel file
 define build-recoveryimage-target
   $(if $(filter true,$(PRODUCT_SUPPORTS_VBOOT)), \
-    $(MKBOOTIMG) --kernel $(2) $(MKBOOTIMG_KERNEL_ARG) $(INTERNAL_RECOVERYIMAGE_ARGS) \
+    $(MKBOOTIMG) --kernel $(2) $(INTERNAL_RECOVERYIMAGE_ARGS) \
                  $(INTERNAL_MKBOOTIMG_VERSION_ARGS) $(BOARD_RECOVERY_MKBOOTIMG_ARGS) \
                  --output $(1).unsigned, \
-    $(MKBOOTIMG) --kernel $(2) $(MKBOOTIMG_KERNEL_ARG) $(INTERNAL_RECOVERYIMAGE_ARGS) \
+    $(MKBOOTIMG) --kernel $(2) $(INTERNAL_RECOVERYIMAGE_ARGS) \
                  $(INTERNAL_MKBOOTIMG_VERSION_ARGS) $(BOARD_RECOVERY_MKBOOTIMG_ARGS) \
                  --output $(1))
   $(if $(filter true,$(PRODUCT_SUPPORTS_BOOT_SIGNER)),\
@@ -3472,8 +3471,12 @@
 endef
 
 ifdef INSTALLED_BOOTIMAGE_TARGET
+# multiple hashes for an image are not yet supported, fortunately this
+# only arises for GKI where the boot descriptor can be left out
+ifeq ($(strip $(BOARD_KERNEL_BINARIES)),)
 $(eval $(call check-and-set-avb-args,boot))
 endif
+endif
 
 ifdef INSTALLED_VENDOR_BOOTIMAGE_TARGET
 $(eval $(call check-and-set-avb-args,vendor_boot))
@@ -4128,6 +4131,8 @@
 endif
 ifeq ($(INSTALLED_BOOTIMAGE_TARGET),)
 	$(hide) echo "no_boot=true" >> $@
+else
+	echo "boot_images=$(foreach b,$(INSTALLED_BOOTIMAGE_TARGET),$(notdir $(b)))" >> $@
 endif
 ifneq ($(INSTALLED_VENDOR_BOOTIMAGE_TARGET),)
 	echo "vendor_boot=true" >> $@
diff --git a/target/board/emulator_arm64/BoardConfig.mk b/target/board/emulator_arm64/BoardConfig.mk
new file mode 100644
index 0000000..b34ccb4
--- /dev/null
+++ b/target/board/emulator_arm64/BoardConfig.mk
@@ -0,0 +1,77 @@
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# arm64 emulator specific definitions
+TARGET_ARCH := arm64
+TARGET_ARCH_VARIANT := armv8-a
+TARGET_CPU_VARIANT := generic
+TARGET_CPU_ABI := arm64-v8a
+
+TARGET_2ND_ARCH := arm
+TARGET_2ND_CPU_ABI := armeabi-v7a
+TARGET_2ND_CPU_ABI2 := armeabi
+
+ifneq ($(TARGET_BUILD_APPS)$(filter cts sdk vts10,$(MAKECMDGOALS)),)
+# DO NOT USE
+# DO NOT USE
+#
+# This architecture / CPU variant must NOT be used for any 64 bit
+# platform builds. It is the lowest common denominator required
+# to build an unbundled application or cts for all supported 32 and 64 bit
+# platforms.
+#
+# If you're building a 64 bit platform (and not an application) the
+# ARM-v8 specification allows you to assume all the features available in an
+# armv7-a-neon CPU. You should set the following as 2nd arch/cpu variant:
+#
+# TARGET_2ND_ARCH_VARIANT := armv8-a
+# TARGET_2ND_CPU_VARIANT := generic
+#
+# DO NOT USE
+# DO NOT USE
+TARGET_2ND_ARCH_VARIANT := armv7-a-neon
+# DO NOT USE
+# DO NOT USE
+TARGET_2ND_CPU_VARIANT := generic
+# DO NOT USE
+# DO NOT USE
+else
+TARGET_2ND_ARCH_VARIANT := armv8-a
+TARGET_2ND_CPU_VARIANT := generic
+endif
+
+include build/make/target/board/BoardConfigGsiCommon.mk
+include build/make/target/board/BoardConfigEmuCommon.mk
+
+TARGET_NO_KERNEL := false
+TARGET_NO_VENDOR_BOOT := false
+BOARD_USES_RECOVERY_AS_BOOT := true
+
+BOARD_BOOTIMAGE_PARTITION_SIZE := 0x02000000
+BOARD_USERDATAIMAGE_PARTITION_SIZE := 576716800
+
+BOARD_BOOT_HEADER_VERSION := 3
+BOARD_MKBOOTIMG_ARGS += --header_version $(BOARD_BOOT_HEADER_VERSION)
+
+# Wifi.
+BOARD_WLAN_DEVICE           := emulator
+BOARD_HOSTAPD_DRIVER        := NL80211
+BOARD_WPA_SUPPLICANT_DRIVER := NL80211
+BOARD_HOSTAPD_PRIVATE_LIB   := lib_driver_cmd_simulated
+BOARD_WPA_SUPPLICANT_PRIVATE_LIB := lib_driver_cmd_simulated
+WPA_SUPPLICANT_VERSION      := VER_0_8_X
+WIFI_DRIVER_FW_PATH_PARAM   := "/dev/null"
+WIFI_DRIVER_FW_PATH_STA     := "/dev/null"
+WIFI_DRIVER_FW_PATH_AP      := "/dev/null"
diff --git a/target/board/emulator_arm64/device.mk b/target/board/emulator_arm64/device.mk
new file mode 100644
index 0000000..6753c11
--- /dev/null
+++ b/target/board/emulator_arm64/device.mk
@@ -0,0 +1,29 @@
+#
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Cuttlefish has GKI kernel prebuilts, so use those for the GKI boot.img.
+ifeq ($(TARGET_PREBUILT_KERNEL),)
+    LOCAL_KERNEL := device/google/cuttlefish_kernel/5.4-arm64/kernel
+else
+    LOCAL_KERNEL := $(TARGET_PREBUILT_KERNEL)
+endif
+
+PRODUCT_COPY_FILES += \
+    $(LOCAL_KERNEL):kernel
+
+# Adjust the Dalvik heap to be appropriate for a tablet.
+$(call inherit-product-if-exists, frameworks/base/build/tablet-dalvik-heap.mk)
+$(call inherit-product-if-exists, frameworks/native/build/tablet-dalvik-heap.mk)
diff --git a/target/board/emulator_arm64/system_ext.prop b/target/board/emulator_arm64/system_ext.prop
new file mode 100644
index 0000000..2f8f803
--- /dev/null
+++ b/target/board/emulator_arm64/system_ext.prop
@@ -0,0 +1,5 @@
+#
+# system.prop for emulator arm64 sdk
+#
+
+rild.libpath=/vendor/lib64/libreference-ril.so
diff --git a/target/board/generic_arm64/BoardConfig.mk b/target/board/generic_arm64/BoardConfig.mk
index a5264e4..91d5692 100644
--- a/target/board/generic_arm64/BoardConfig.mk
+++ b/target/board/generic_arm64/BoardConfig.mk
@@ -53,20 +53,21 @@
 endif
 
 include build/make/target/board/BoardConfigGsiCommon.mk
-include build/make/target/board/BoardConfigEmuCommon.mk
 
 TARGET_NO_KERNEL := false
 TARGET_NO_VENDOR_BOOT := true
 BOARD_USES_RECOVERY_AS_BOOT := true
 
-BOARD_BOOTIMAGE_PARTITION_SIZE := 0x02000000
+BOARD_BOOTIMAGE_PARTITION_SIZE := 0x04000000
 BOARD_USERDATAIMAGE_PARTITION_SIZE := 576716800
 
 BOARD_BOOT_HEADER_VERSION := 3
 BOARD_MKBOOTIMG_ARGS += --header_version $(BOARD_BOOT_HEADER_VERSION)
 
-# Emulator system image is going to be used as GSI and some vendor still hasn't
-# cleaned up all device specific directories under root!
+BOARD_KERNEL_BINARIES := kernel-5.4 kernel-5.4-gz kernel-5.4-lz4
+
+# Some vendors still haven't cleaned up all device specific directories under
+# root!
 
 # TODO(b/111434759, b/111287060) SoC specific hacks
 BOARD_ROOT_EXTRA_SYMLINKS += /vendor/lib/dsp:/dsp
@@ -76,14 +77,3 @@
 # TODO(b/36764215): remove this setting when the generic system image
 # no longer has QCOM-specific directories under /.
 BOARD_SEPOLICY_DIRS += build/make/target/board/generic_arm64/sepolicy
-
-# Wifi.
-BOARD_WLAN_DEVICE           := emulator
-BOARD_HOSTAPD_DRIVER        := NL80211
-BOARD_WPA_SUPPLICANT_DRIVER := NL80211
-BOARD_HOSTAPD_PRIVATE_LIB   := lib_driver_cmd_simulated
-BOARD_WPA_SUPPLICANT_PRIVATE_LIB := lib_driver_cmd_simulated
-WPA_SUPPLICANT_VERSION      := VER_0_8_X
-WIFI_DRIVER_FW_PATH_PARAM   := "/dev/null"
-WIFI_DRIVER_FW_PATH_STA     := "/dev/null"
-WIFI_DRIVER_FW_PATH_AP      := "/dev/null"
diff --git a/target/board/generic_arm64/device.mk b/target/board/generic_arm64/device.mk
index 4fcae46..3b7cd44 100644
--- a/target/board/generic_arm64/device.mk
+++ b/target/board/generic_arm64/device.mk
@@ -14,15 +14,10 @@
 # limitations under the License.
 #
 
-# Cuttlefish has GKI kernel prebuilts, so use those for the GKI boot.img.
-ifeq ($(TARGET_PREBUILT_KERNEL),)
-    LOCAL_KERNEL := device/google/cuttlefish_kernel/5.4-arm64/kernel
-else
-    LOCAL_KERNEL := $(TARGET_PREBUILT_KERNEL)
-endif
-
 PRODUCT_COPY_FILES += \
-    $(LOCAL_KERNEL):kernel
+    device/google/cuttlefish_kernel/5.4-arm64/kernel-5.4:kernel-5.4 \
+    device/google/cuttlefish_kernel/5.4-arm64/kernel-5.4-gz:kernel-5.4-gz \
+    device/google/cuttlefish_kernel/5.4-arm64/kernel-5.4-lz4:kernel-5.4-lz4
 
 # Adjust the Dalvik heap to be appropriate for a tablet.
 $(call inherit-product-if-exists, frameworks/base/build/tablet-dalvik-heap.mk)
diff --git a/target/product/aosp_arm64.mk b/target/product/aosp_arm64.mk
index 491397f..e88a366 100644
--- a/target/product/aosp_arm64.mk
+++ b/target/product/aosp_arm64.mk
@@ -14,8 +14,6 @@
 # limitations under the License.
 #
 
-PRODUCT_USE_DYNAMIC_PARTITIONS := true
-
 # The system image of aosp_arm64-userdebug is a GSI for the devices with:
 # - ARM 64 bits user space
 # - 64 bits binder interface
diff --git a/target/product/sdk_phone_arm64.mk b/target/product/sdk_phone_arm64.mk
index 9024890..3ab0c57 100644
--- a/target/product/sdk_phone_arm64.mk
+++ b/target/product/sdk_phone_arm64.mk
@@ -15,8 +15,36 @@
 #
 QEMU_USE_SYSTEM_EXT_PARTITIONS := true
 
-$(call inherit-product, $(SRC_TARGET_DIR)/product/aosp_arm64.mk)
+PRODUCT_USE_DYNAMIC_PARTITIONS := true
+
+# This is a build configuration for a full-featured build of the
+# Open-Source part of the tree. It's geared toward a US-centric
+# build quite specifically for the emulator, and might not be
+# entirely appropriate to inherit from for on-device configurations.
+
+#
+# All components inherited here go to system image
+#
+$(call inherit-product, $(SRC_TARGET_DIR)/product/core_64_bit.mk)
+$(call inherit-product, $(SRC_TARGET_DIR)/product/mainline_system.mk)
+
+#
+# All components inherited here go to system_ext image
+#
+$(call inherit-product, $(SRC_TARGET_DIR)/product/handheld_system_ext.mk)
+$(call inherit-product, $(SRC_TARGET_DIR)/product/telephony_system_ext.mk)
+
+#
+# All components inherited here go to product image
+#
+$(call inherit-product, $(SRC_TARGET_DIR)/product/aosp_product.mk)
+
+#
+# All components inherited here go to vendor or vendor_boot image
+#
 $(call inherit-product-if-exists, device/generic/goldfish/arm64-vendor.mk)
+$(call inherit-product, $(SRC_TARGET_DIR)/product/emulator_vendor.mk)
+$(call inherit-product, $(SRC_TARGET_DIR)/board/emulator_arm64/device.mk)
 
 # Define the host tools and libs that are parts of the SDK.
 $(call inherit-product, sdk/build/product_sdk.mk)
@@ -29,7 +57,7 @@
 # Overrides
 PRODUCT_BRAND := Android
 PRODUCT_NAME := sdk_phone_arm64
-PRODUCT_DEVICE := generic_arm64
+PRODUCT_DEVICE := emulator_arm64
 PRODUCT_MODEL := Android SDK built for arm64
 
 
diff --git a/tools/releasetools/add_img_to_target_files.py b/tools/releasetools/add_img_to_target_files.py
index cc05c64..7db506c 100755
--- a/tools/releasetools/add_img_to_target_files.py
+++ b/tools/releasetools/add_img_to_target_files.py
@@ -731,16 +731,24 @@
   boot_image = None
   if has_boot:
     banner("boot")
-    # common.GetBootableImage() returns the image directly if present.
-    boot_image = common.GetBootableImage(
-        "IMAGES/boot.img", "boot.img", OPTIONS.input_tmp, "BOOT")
-    # boot.img may be unavailable in some targets (e.g. aosp_arm64).
-    if boot_image:
-      partitions['boot'] = os.path.join(OPTIONS.input_tmp, "IMAGES", "boot.img")
-      if not os.path.exists(partitions['boot']):
-        boot_image.WriteToDir(OPTIONS.input_tmp)
-        if output_zip:
-          boot_image.AddToZip(output_zip)
+    boot_images = OPTIONS.info_dict.get("boot_images")
+    if boot_images is None:
+      boot_images = "boot.img"
+    for b in boot_images.split():
+      # common.GetBootableImage() returns the image directly if present.
+      boot_image = common.GetBootableImage(
+          "IMAGES/" + b, b, OPTIONS.input_tmp, "BOOT")
+      # boot.img may be unavailable in some targets (e.g. aosp_arm64).
+      if boot_image:
+        boot_image_path = os.path.join(OPTIONS.input_tmp, "IMAGES", b)
+        # vbmeta does not need to include boot.img with multiple boot.img files,
+        # which is only used for aosp_arm64 for GKI
+        if len(boot_images.split()) == 1:
+          partitions['boot'] = boot_image_path
+        if not os.path.exists(boot_image_path):
+          boot_image.WriteToDir(OPTIONS.input_tmp)
+          if output_zip:
+            boot_image.AddToZip(output_zip)
 
   if has_vendor_boot:
     banner("vendor_boot")
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index ffcd38b..536d47f 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -1015,7 +1015,7 @@
   return ramdisk_img
 
 
-def _BuildBootableImage(sourcedir, fs_config_file, info_dict=None,
+def _BuildBootableImage(image_name, sourcedir, fs_config_file, info_dict=None,
                         has_ramdisk=False, two_step_image=False):
   """Build a bootable image from the specified sourcedir.
 
@@ -1028,7 +1028,15 @@
   for building the requested image.
   """
 
-  if not os.access(os.path.join(sourcedir, "kernel"), os.F_OK):
+  # "boot" or "recovery", without extension.
+  partition_name = os.path.basename(sourcedir).lower()
+
+  if partition_name == "recovery":
+    kernel = "kernel"
+  else:
+    kernel = image_name.replace("boot", "kernel")
+    kernel = kernel.replace(".img","")
+  if not os.access(os.path.join(sourcedir, kernel), os.F_OK):
     return None
 
   if has_ramdisk and not os.access(os.path.join(sourcedir, "RAMDISK"), os.F_OK):
@@ -1045,7 +1053,7 @@
   # use MKBOOTIMG from environ, or "mkbootimg" if empty or not set
   mkbootimg = os.getenv('MKBOOTIMG') or "mkbootimg"
 
-  cmd = [mkbootimg, "--kernel", os.path.join(sourcedir, "kernel")]
+  cmd = [mkbootimg, "--kernel", os.path.join(sourcedir, kernel)]
 
   fn = os.path.join(sourcedir, "second")
   if os.access(fn, os.F_OK):
@@ -1072,9 +1080,6 @@
     cmd.append("--pagesize")
     cmd.append(open(fn).read().rstrip("\n"))
 
-  # "boot" or "recovery", without extension.
-  partition_name = os.path.basename(sourcedir).lower()
-
   if partition_name == "recovery":
     args = info_dict.get("recovery_mkbootimg_args")
   else:
@@ -1197,7 +1202,7 @@
                  info_dict.get("recovery_as_boot") == "true")
 
   fs_config = "META/" + tree_subdir.lower() + "_filesystem_config.txt"
-  data = _BuildBootableImage(os.path.join(unpack_dir, tree_subdir),
+  data = _BuildBootableImage(prebuilt_name, os.path.join(unpack_dir, tree_subdir),
                              os.path.join(unpack_dir, fs_config),
                              info_dict, has_ramdisk, two_step_image)
   if data: