diff --git a/core/Makefile b/core/Makefile
index 17f45cf..1c4288d 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -395,13 +395,13 @@
 	$(call pretty,"Target boot image: $@")
 	$(hide) $(MKEXT2BOOTIMG) $(INTERNAL_BOOTIMAGE_ARGS) --output $@
 
-else # TARGET_BOOTIMAGE_USE_EXT2 != true
+else ifndef BOARD_CUSTOM_BOOTIMG_MK # TARGET_BOOTIMAGE_USE_EXT2 != true
 
 $(INSTALLED_BOOTIMAGE_TARGET): $(MKBOOTIMG) $(INTERNAL_BOOTIMAGE_FILES)
 	$(call pretty,"Target boot image: $@")
 	$(hide) $(MKBOOTIMG) $(INTERNAL_BOOTIMAGE_ARGS) --output $@
 	$(hide) $(call assert-max-image-size,$@,$(BOARD_BOOTIMAGE_PARTITION_SIZE),raw)
-endif # TARGET_BOOTIMAGE_USE_EXT2
+endif # ifndef BOARD_CUSTOM_BOOTIMG_MK
 
 else	# TARGET_NO_KERNEL
 # HACK: The top-level targets depend on the bootimage.  Not all targets
@@ -630,11 +630,11 @@
 	@mkdir -p $(dir $@)
 	java -jar $(DUMPKEY_JAR) $(PRIVATE_OTA_PUBLIC_KEYS) $(extra_keys) > $@
 
-$(INSTALLED_RECOVERYIMAGE_TARGET): $(MKBOOTFS) $(MKBOOTIMG) $(MINIGZIP) \
+$(recovery_ramdisk): $(MKBOOTIMG) $(MINIGZIP) \
 		$(INSTALLED_RAMDISK_TARGET) \
 		$(INSTALLED_BOOTIMAGE_TARGET) \
 		$(recovery_binary) \
-		$(recovery_initrc) $(recovery_kernel) \
+		$(recovery_initrc) \
 		$(INSTALLED_2NDBOOTLOADER_TARGET) \
 		$(recovery_build_prop) $(recovery_resource_deps) \
 		$(recovery_fstab) \
@@ -659,10 +659,14 @@
 	cp $(RECOVERY_INSTALL_OTA_KEYS) $(TARGET_RECOVERY_ROOT_OUT)/res/keys
 	cat $(INSTALLED_DEFAULT_PROP_TARGET) $(recovery_build_prop) \
 	        > $(TARGET_RECOVERY_ROOT_OUT)/default.prop
-	$(MKBOOTFS) $(TARGET_RECOVERY_ROOT_OUT) | $(MINIGZIP) > $(recovery_ramdisk)
-	$(MKBOOTIMG) $(INTERNAL_RECOVERYIMAGE_ARGS) --output $@
-	@echo ----- Made recovery image -------- $@
+	$(MKBOOTFS) $(TARGET_RECOVERY_ROOT_OUT) | $(MINIGZIP) > $@
+
+ifndef BOARD_CUSTOM_BOOTIMG_MK
+$(INSTALLED_RECOVERYIMAGE_TARGET): $(MKBOOTIMG) $(recovery_ramdisk) $(recovery_kernel)
+	$(call pretty,"Target recovery image: $@")
+	$(hide) $(MKBOOTIMG) $(INTERNAL_RECOVERYIMAGE_ARGS) --output $@
 	$(hide) $(call assert-max-image-size,$@,$(BOARD_RECOVERYIMAGE_PARTITION_SIZE),raw)
+endif
 
 else
 INSTALLED_RECOVERYIMAGE_TARGET :=
@@ -684,6 +688,10 @@
 BOARD_NAND_SPARE_SIZE := 64
 endif
 
+ifdef BOARD_CUSTOM_BOOTIMG_MK
+include $(BOARD_CUSTOM_BOOTIMG_MK)
+endif
+
 # -----------------------------------------------------------------
 # system image
 #
@@ -753,7 +761,11 @@
 # image size check calculation.
 ifneq ($(INSTALLED_RECOVERYIMAGE_TARGET),)
 intermediates := $(call intermediates-dir-for,PACKAGING,recovery_patch)
+ifndef BOARD_CUSTOM_BOOTIMG_MK
 RECOVERY_FROM_BOOT_PATCH := $(intermediates)/recovery_from_boot.p
+else
+RECOVERY_FROM_BOOT_PATCH :=
+endif
 $(RECOVERY_FROM_BOOT_PATCH): $(INSTALLED_RECOVERYIMAGE_TARGET) \
                              $(INSTALLED_BOOTIMAGE_TARGET) \
 			     $(HOST_OUT_EXECUTABLES)/imgdiff \
@@ -896,6 +908,7 @@
   $(hide) $(call assert-max-image-size,$(INSTALLED_USERDATAIMAGE_TARGET),$(BOARD_USERDATAIMAGE_PARTITION_SIZE),yaffs)
 endef
 
+
 # We just build this directly to the install location.
 INSTALLED_USERDATAIMAGE_TARGET := $(BUILT_USERDATAIMAGE_TARGET)
 $(INSTALLED_USERDATAIMAGE_TARGET): $(INTERNAL_USERIMAGES_DEPS) \
@@ -1152,9 +1165,15 @@
 
 $(INTERNAL_OTA_PACKAGE_TARGET): KEY_CERT_PAIR := $(DEFAULT_KEY_CERT_PAIR)
 
+ifeq ($(TARGET_RELEASETOOL_OTA_FROM_TARGET_SCRIPT),)
+	OTA_FROM_TARGET_SCRIPT := ./build/tools/releasetools/ota_from_target_files
+else
+	OTA_FROM_TARGET_SCRIPT := $(TARGET_RELEASETOOL_OTA_FROM_TARGET_SCRIPT)
+endif
+
 $(INTERNAL_OTA_PACKAGE_TARGET): $(BUILT_TARGET_FILES_PACKAGE) $(DISTTOOLS)
 	@echo "Package OTA: $@"
-	$(hide) ./build/tools/releasetools/ota_from_target_files -v \
+	$(OTA_FROM_TARGET_SCRIPT) -v \
 	   -p $(HOST_OUT) \
 	   -k $(KEY_CERT_PAIR) \
 	   $(BUILT_TARGET_FILES_PACKAGE) $@
@@ -1180,9 +1199,15 @@
 $(INTERNAL_UPDATE_PACKAGE_TARGET): extensions := $(TARGET_RELEASETOOLS_EXTENSIONS)
 endif
 
+ifeq ($(TARGET_RELEASETOOL_IMG_FROM_TARGET_SCRIPT),)
+	IMG_FROM_TARGET_SCRIPT := ./build/tools/releasetools/img_from_target_files
+else
+	IMG_FROM_TARGET_SCRIPT := $(TARGET_RELEASETOOL_IMG_FROM_TARGET_SCRIPT)
+endif
+
 $(INTERNAL_UPDATE_PACKAGE_TARGET): $(BUILT_TARGET_FILES_PACKAGE) $(DISTTOOLS)
 	@echo "Package: $@"
-	$(hide) ./build/tools/releasetools/img_from_target_files -v \
+	$(IMG_FROM_TARGET_SCRIPT) -v \
 	   -s $(extensions) \
 	   -p $(HOST_OUT) \
 	   $(BUILT_TARGET_FILES_PACKAGE) $@