diff --git a/core/Makefile b/core/Makefile
index af03c2e..e52c67a 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -2331,6 +2331,81 @@
 
 endif # TARGET_NO_KERNEL
 
+ifeq ($(BUILDING_VENDOR_BOOT_IMAGE),true)
+ifeq ($(BUILDING_RAMDISK_IMAGE),true)
+# -----------------------------------------------------------------
+# vendor debug ramdisk
+# Combines vendor ramdisk files and debug ramdisk files to build the vendor debug ramdisk.
+INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET := $(PRODUCT_OUT)/vendor-ramdisk-debug.cpio.gz
+$(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET): DEBUG_RAMDISK_FILES := $(INTERNAL_DEBUG_RAMDISK_FILES)
+$(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET): VENDOR_RAMDISK_DIR := $(TARGET_VENDOR_RAMDISK_OUT)
+
+INTERNAL_VENDOR_DEBUG_RAMDISK_FILES := $(filter $(TARGET_VENDOR_DEBUG_RAMDISK_OUT)/%, \
+    $(ALL_GENERATED_SOURCES) \
+    $(ALL_DEFAULT_INSTALLED_MODULES))
+
+# Note: TARGET_VENDOR_DEBUG_RAMDISK_OUT will be $(PRODUCT_OUT)/vendor_debug_ramdisk/first_stage_ramdisk,
+# if BOARD_USES_RECOVERY_AS_BOOT is true. Otherwise, it will be $(PRODUCT_OUT)/vendor_debug_ramdisk.
+# But the path of $(VENDOR_DEBUG_RAMDISK_DIR) to build the vendor debug ramdisk, is always
+# $(PRODUCT_OUT)/vendor_debug_ramdisk.
+$(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET): VENDOR_DEBUG_RAMDISK_DIR := $(PRODUCT_OUT)/vendor_debug_ramdisk
+$(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET): $(INTERNAL_VENDOR_RAMDISK_TARGET) $(INSTALLED_DEBUG_RAMDISK_TARGET)
+$(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET): $(MKBOOTFS) $(INTERNAL_VENDOR_DEBUG_RAMDISK_FILES) | $(MINIGZIP)
+	$(call pretty,"Target vendor debug ram disk: $@")
+	mkdir -p $(TARGET_VENDOR_DEBUG_RAMDISK_OUT)
+	touch $(TARGET_VENDOR_DEBUG_RAMDISK_OUT)/force_debuggable
+	$(foreach debug_file,$(DEBUG_RAMDISK_FILES), \
+	  cp -f $(debug_file) $(subst $(PRODUCT_OUT)/debug_ramdisk,$(PRODUCT_OUT)/vendor_debug_ramdisk,$(debug_file)) &&) true
+	rsync -a $(VENDOR_RAMDISK_DIR)/ $(VENDOR_DEBUG_RAMDISK_DIR)
+	$(MKBOOTFS) -d $(TARGET_OUT) $(VENDOR_DEBUG_RAMDISK_DIR) | $(MINIGZIP) > $@
+
+INSTALLED_FILES_FILE_VENDOR_DEBUG_RAMDISK := $(PRODUCT_OUT)/installed-files-vendor-ramdisk-debug.txt
+INSTALLED_FILES_JSON_VENDOR_DEBUG_RAMDISK := $(INSTALLED_FILES_FILE_VENDOR_DEBUG_RAMDISK:.txt=.json)
+$(INSTALLED_FILES_FILE_VENDOR_DEBUG_RAMDISK): .KATI_IMPLICIT_OUTPUTS := $(INSTALLED_FILES_JSON_VENDOR_DEBUG_RAMDISK)
+$(INSTALLED_FILES_FILE_VENDOR_DEBUG_RAMDISK): VENDOR_DEBUG_RAMDISK_DIR := $(PRODUCT_OUT)/vendor_debug_ramdisk
+
+# The vendor debug ramdisk will rsync from $(TARGET_VENDOR_RAMDISK_OUT) and $(INTERNAL_DEBUG_RAMDISK_FILES),
+# so we have to wait for the vendor debug ramdisk to be built before generating the installed file list.
+$(INSTALLED_FILES_FILE_VENDOR_DEBUG_RAMDISK): $(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET)
+$(INSTALLED_FILES_FILE_VENDOR_DEBUG_RAMDISK): $(INTERNAL_VENDOR_DEBUG_RAMDISK_FILES) $(FILESLIST) $(FILESLIST_UTIL)
+	echo Installed file list: $@
+	mkdir -p $(dir $@)
+	rm -f $@
+	$(FILESLIST) $(VENDOR_DEBUG_RAMDISK_DIR) > $(@:.txt=.json)
+	$(FILESLIST_UTIL) -c $(@:.txt=.json) > $@
+
+# -----------------------------------------------------------------
+# vendor_boot-debug.img.
+INSTALLED_VENDOR_DEBUG_BOOTIMAGE_TARGET := $(PRODUCT_OUT)/vendor_boot-debug.img
+
+# The util to sign vendor_boot-debug.img with a test key.
+BOARD_AVB_VENDOR_BOOT_TEST_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
+INTERNAL_AVB_VENDOR_BOOT_TEST_SIGNING_ARGS := --algorithm SHA256_RSA2048 --key $(BOARD_AVB_VENDOR_BOOT_TEST_KEY_PATH)
+# $(1): the vendor bootimage to sign
+define test-key-sign-vendor-bootimage
+$(call assert-max-image-size,$(1),$(call get-hash-image-max-size,$(BOARD_VENDOR_BOOTIMAGE_PARTITION_SIZE)))
+$(AVBTOOL) add_hash_footer \
+  --image $(1) \
+  --partition_size $(BOARD_VENDOR_BOOTIMAGE_PARTITION_SIZE) \
+  --partition_name vendor_boot $(INTERNAL_AVB_VENDOR_BOOT_TEST_SIGNING_ARGS) \
+  $(BOARD_AVB_VENDOR_BOOT_ADD_HASH_FOOTER_ARGS)
+$(call assert-max-image-size,$(1),$(BOARD_VENDOR_BOOTIMAGE_PARTITION_SIZE))
+endef
+
+ifneq ($(BOARD_AVB_VENDOR_BOOT_KEY_PATH),)
+$(INSTALLED_VENDOR_DEBUG_BOOTIMAGE_TARGET): $(AVBTOOL) $(BOARD_AVB_VENDOR_BOOT_TEST_KEY_PATH)
+endif
+
+# Depends on vendor_boot.img and vendor-ramdisk-debug.cpio.gz to build the new vendor_boot-debug.img
+$(INSTALLED_VENDOR_DEBUG_BOOTIMAGE_TARGET): $(MKBOOTIMG) $(INSTALLED_VENDOR_BOOTIMAGE_TARGET) $(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET)
+	$(call pretty,"Target vendor_boot debug image: $@")
+	$(MKBOOTIMG) $(INTERNAL_VENDOR_BOOTIMAGE_ARGS) $(INTERNAL_MKBOOTIMG_VERSION_ARGS) $(BOARD_MKBOOTIMG_ARGS) --vendor_ramdisk $(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET) --vendor_boot $@
+	$(call assert-max-image-size,$@,$(BOARD_VENDOR_BOOTIMAGE_PARTITION_SIZE))
+	$(if $(BOARD_AVB_VENDOR_BOOT_KEY_PATH),$(call test-key-sign-vendor-bootimage,$@))
+
+endif # BUILDING_RAMDISK_IMAGE
+endif # BUILDING_VENDOR_BOOT_IMAGE
+
 # -----------------------------------------------------------------
 # The test harness ramdisk, which is based off debug_ramdisk, plus a
 # few additional test-harness-specific properties in adb_debug.prop.
diff --git a/core/board_config.mk b/core/board_config.mk
index 91d4fd6..61abc36 100644
--- a/core/board_config.mk
+++ b/core/board_config.mk
@@ -282,6 +282,7 @@
 # Now we can substitute with the real value of TARGET_COPY_OUT_DEBUG_RAMDISK
 ifeq ($(BOARD_USES_RECOVERY_AS_BOOT),true)
 TARGET_COPY_OUT_DEBUG_RAMDISK := debug_ramdisk/first_stage_ramdisk
+TARGET_COPY_OUT_VENDOR_DEBUG_RAMDISK := vendor_debug_ramdisk/first_stage_ramdisk
 TARGET_COPY_OUT_TEST_HARNESS_RAMDISK := test_harness_ramdisk/first_stage_ramdisk
 endif
 
diff --git a/core/envsetup.mk b/core/envsetup.mk
index d35cb7e..04a970f 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -228,6 +228,7 @@
 TARGET_COPY_OUT_OEM := oem
 TARGET_COPY_OUT_RAMDISK := ramdisk
 TARGET_COPY_OUT_DEBUG_RAMDISK := debug_ramdisk
+TARGET_COPY_OUT_VENDOR_DEBUG_RAMDISK := vendor_debug_ramdisk
 TARGET_COPY_OUT_TEST_HARNESS_RAMDISK := test_harness_ramdisk
 TARGET_COPY_OUT_ROOT := root
 TARGET_COPY_OUT_RECOVERY := recovery
@@ -818,6 +819,7 @@
 TARGET_RAMDISK_OUT := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_RAMDISK)
 TARGET_RAMDISK_OUT_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)
 TARGET_DEBUG_RAMDISK_OUT := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_DEBUG_RAMDISK)
+TARGET_VENDOR_DEBUG_RAMDISK_OUT := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_VENDOR_DEBUG_RAMDISK)
 TARGET_TEST_HARNESS_RAMDISK_OUT := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_TEST_HARNESS_RAMDISK)
 
 TARGET_VENDOR_RAMDISK_OUT := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_VENDOR_RAMDISK)
diff --git a/core/main.mk b/core/main.mk
index ec1effd..34d185a 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -1378,6 +1378,9 @@
 .PHONY: ramdisk_test_harness
 ramdisk_test_harness: $(INSTALLED_TEST_HARNESS_RAMDISK_TARGET)
 
+.PHONY: vendor_ramdisk_debug
+vendor_ramdisk_debug: $(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET)
+
 .PHONY: userdataimage
 userdataimage: $(INSTALLED_USERDATAIMAGE_TARGET)
 
@@ -1397,6 +1400,9 @@
 .PHONY: vendorbootimage
 vendorbootimage: $(INSTALLED_VENDOR_BOOTIMAGE_TARGET)
 
+.PHONY: vendorbootimage_debug
+vendorbootimage_debug: $(INSTALLED_VENDOR_DEBUG_BOOTIMAGE_TARGET)
+
 .PHONY: productimage
 productimage: $(INSTALLED_PRODUCTIMAGE_TARGET)
 
@@ -1443,6 +1449,8 @@
     $(INSTALLED_BPTIMAGE_TARGET) \
     $(INSTALLED_VENDORIMAGE_TARGET) \
     $(INSTALLED_VENDOR_BOOTIMAGE_TARGET) \
+    $(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET) \
+    $(INSTALLED_VENDOR_DEBUG_BOOTIMAGE_TARGET) \
     $(INSTALLED_ODMIMAGE_TARGET) \
     $(INSTALLED_SUPERIMAGE_EMPTY_TARGET) \
     $(INSTALLED_PRODUCTIMAGE_TARGET) \
@@ -1463,6 +1471,8 @@
     $(INSTALLED_FILES_JSON_RAMDISK) \
     $(INSTALLED_FILES_FILE_DEBUG_RAMDISK) \
     $(INSTALLED_FILES_JSON_DEBUG_RAMDISK) \
+    $(INSTALLED_FILES_FILE_VENDOR_DEBUG_RAMDISK) \
+    $(INSTALLED_FILES_JSON_VENDOR_DEBUG_RAMDISK) \
     $(INSTALLED_FILES_FILE_ROOT) \
     $(INSTALLED_FILES_JSON_ROOT) \
     $(INSTALLED_FILES_FILE_RECOVERY) \
@@ -1586,8 +1596,12 @@
       $(INSTALLED_FILES_JSON_RAMDISK) \
       $(INSTALLED_FILES_FILE_DEBUG_RAMDISK) \
       $(INSTALLED_FILES_JSON_DEBUG_RAMDISK) \
+      $(INSTALLED_FILES_FILE_VENDOR_DEBUG_RAMDISK) \
+      $(INSTALLED_FILES_JSON_VENDOR_DEBUG_RAMDISK) \
       $(INSTALLED_DEBUG_RAMDISK_TARGET) \
       $(INSTALLED_DEBUG_BOOTIMAGE_TARGET) \
+      $(INSTALLED_VENDOR_DEBUG_RAMDISK_TARGET) \
+      $(INSTALLED_VENDOR_DEBUG_BOOTIMAGE_TARGET) \
     )
     $(call dist-for-goals, bootimage_test_harness, \
       $(INSTALLED_TEST_HARNESS_RAMDISK_TARGET) \