diff --git a/core/envsetup.mk b/core/envsetup.mk
index 8ac437e..ab8426e 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -120,6 +120,29 @@
 $(error must be empty or one of: eng user userdebug)
 endif
 
+# Boards may be defined under $(SRC_TARGET_DIR)/board/$(TARGET_DEVICE)
+# or under vendor/*/$(TARGET_DEVICE).  Search in both places, but
+# make sure only one exists.
+# Real boards should always be associated with an OEM vendor.
+board_config_mk := \
+	$(strip $(wildcard \
+		$(SRC_TARGET_DIR)/board/$(TARGET_DEVICE)/BoardConfig.mk \
+		$(shell test -d device && find device -maxdepth 4 -path '*/$(TARGET_DEVICE)/BoardConfig.mk') \
+		$(shell test -d vendor && find vendor -maxdepth 4 -path '*/$(TARGET_DEVICE)/BoardConfig.mk') \
+	))
+ifeq ($(board_config_mk),)
+  $(error No config file found for TARGET_DEVICE $(TARGET_DEVICE))
+endif
+ifneq ($(words $(board_config_mk)),1)
+  $(error Multiple board config files for TARGET_DEVICE $(TARGET_DEVICE): $(board_config_mk))
+endif
+include $(board_config_mk)
+ifeq ($(TARGET_ARCH),)
+  $(error TARGET_ARCH not defined by board config: $(board_config_mk))
+endif
+TARGET_DEVICE_DIR := $(patsubst %/,%,$(dir $(board_config_mk)))
+board_config_mk :=
+
 # ---------------------------------------------------------------
 # Set up configuration for target machine.
 # The following must be set:
@@ -172,42 +195,48 @@
 
 OUT_DOCS := $(TARGET_COMMON_OUT_ROOT)/docs
 
-BUILD_OUT_EXECUTABLES:= $(BUILD_OUT)/bin
+BUILD_OUT_EXECUTABLES := $(BUILD_OUT)/bin
 
-HOST_OUT_EXECUTABLES:= $(HOST_OUT)/bin
-HOST_OUT_SHARED_LIBRARIES:= $(HOST_OUT)/lib
-HOST_OUT_JAVA_LIBRARIES:= $(HOST_OUT)/framework
+HOST_OUT_EXECUTABLES := $(HOST_OUT)/bin
+HOST_OUT_SHARED_LIBRARIES := $(HOST_OUT)/lib
+HOST_OUT_JAVA_LIBRARIES := $(HOST_OUT)/framework
 HOST_OUT_SDK_ADDON := $(HOST_OUT)/sdk_addon
 
 HOST_OUT_INTERMEDIATES := $(HOST_OUT)/obj
-HOST_OUT_HEADERS:= $(HOST_OUT_INTERMEDIATES)/include
+HOST_OUT_HEADERS := $(HOST_OUT_INTERMEDIATES)/include
 HOST_OUT_INTERMEDIATE_LIBRARIES := $(HOST_OUT_INTERMEDIATES)/lib
-HOST_OUT_NOTICE_FILES:=$(HOST_OUT_INTERMEDIATES)/NOTICE_FILES
+HOST_OUT_NOTICE_FILES := $(HOST_OUT_INTERMEDIATES)/NOTICE_FILES
 HOST_OUT_COMMON_INTERMEDIATES := $(HOST_COMMON_OUT_ROOT)/obj
 
 TARGET_OUT_INTERMEDIATES := $(PRODUCT_OUT)/obj
-TARGET_OUT_HEADERS:= $(TARGET_OUT_INTERMEDIATES)/include
+TARGET_OUT_HEADERS := $(TARGET_OUT_INTERMEDIATES)/include
 TARGET_OUT_INTERMEDIATE_LIBRARIES := $(TARGET_OUT_INTERMEDIATES)/lib
 TARGET_OUT_COMMON_INTERMEDIATES := $(TARGET_COMMON_OUT_ROOT)/obj
 
 TARGET_OUT := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_SYSTEM)
-TARGET_OUT_EXECUTABLES:= $(TARGET_OUT)/bin
-TARGET_OUT_OPTIONAL_EXECUTABLES:= $(TARGET_OUT)/xbin
-TARGET_OUT_SHARED_LIBRARIES:= $(TARGET_OUT)/lib
-TARGET_OUT_JAVA_LIBRARIES:= $(TARGET_OUT)/framework
-TARGET_OUT_APPS:= $(TARGET_OUT)/app
+TARGET_OUT_EXECUTABLES := $(TARGET_OUT)/bin
+TARGET_OUT_OPTIONAL_EXECUTABLES := $(TARGET_OUT)/xbin
+ifneq ($(filter %64,$(TARGET_ARCH)),)
+# /system/lib always contains 32-bit libraries,
+# and /system/lib64 (if present) always contains 64-bit libraries.
+TARGET_OUT_SHARED_LIBRARIES := $(TARGET_OUT)/lib64
+else
+TARGET_OUT_SHARED_LIBRARIES := $(TARGET_OUT)/lib
+endif
+TARGET_OUT_JAVA_LIBRARIES := $(TARGET_OUT)/framework
+TARGET_OUT_APPS := $(TARGET_OUT)/app
 TARGET_OUT_APPS_PRIVILEGED := $(TARGET_OUT)/priv-app
 TARGET_OUT_KEYLAYOUT := $(TARGET_OUT)/usr/keylayout
 TARGET_OUT_KEYCHARS := $(TARGET_OUT)/usr/keychars
 TARGET_OUT_ETC := $(TARGET_OUT)/etc
-TARGET_OUT_NOTICE_FILES:=$(TARGET_OUT_INTERMEDIATES)/NOTICE_FILES
+TARGET_OUT_NOTICE_FILES := $(TARGET_OUT_INTERMEDIATES)/NOTICE_FILES
 TARGET_OUT_FAKE := $(PRODUCT_OUT)/fake_packages
 
 TARGET_OUT_DATA := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_DATA)
-TARGET_OUT_DATA_EXECUTABLES:= $(TARGET_OUT_EXECUTABLES)
-TARGET_OUT_DATA_SHARED_LIBRARIES:= $(TARGET_OUT_SHARED_LIBRARIES)
-TARGET_OUT_DATA_JAVA_LIBRARIES:= $(TARGET_OUT_DATA)/framework
-TARGET_OUT_DATA_APPS:= $(TARGET_OUT_DATA)/app
+TARGET_OUT_DATA_EXECUTABLES := $(TARGET_OUT_EXECUTABLES)
+TARGET_OUT_DATA_SHARED_LIBRARIES := $(TARGET_OUT_SHARED_LIBRARIES)
+TARGET_OUT_DATA_JAVA_LIBRARIES := $(TARGET_OUT_DATA)/framework
+TARGET_OUT_DATA_APPS := $(TARGET_OUT_DATA)/app
 TARGET_OUT_DATA_KEYLAYOUT := $(TARGET_OUT_KEYLAYOUT)
 TARGET_OUT_DATA_KEYCHARS := $(TARGET_OUT_KEYCHARS)
 TARGET_OUT_DATA_ETC := $(TARGET_OUT_ETC)
@@ -217,11 +246,15 @@
 TARGET_OUT_CACHE := $(PRODUCT_OUT)/cache
 
 TARGET_OUT_VENDOR := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_VENDOR)
-TARGET_OUT_VENDOR_EXECUTABLES:= $(TARGET_OUT_VENDOR)/bin
-TARGET_OUT_VENDOR_OPTIONAL_EXECUTABLES:= $(TARGET_OUT_VENDOR)/xbin
-TARGET_OUT_VENDOR_SHARED_LIBRARIES:= $(TARGET_OUT_VENDOR)/lib
-TARGET_OUT_VENDOR_JAVA_LIBRARIES:= $(TARGET_OUT_VENDOR)/framework
-TARGET_OUT_VENDOR_APPS:= $(TARGET_OUT_VENDOR)/app
+TARGET_OUT_VENDOR_EXECUTABLES := $(TARGET_OUT_VENDOR)/bin
+TARGET_OUT_VENDOR_OPTIONAL_EXECUTABLES := $(TARGET_OUT_VENDOR)/xbin
+ifneq ($(filter %64,$(TARGET_ARCH)),)
+TARGET_OUT_VENDOR_SHARED_LIBRARIES := $(TARGET_OUT_VENDOR)/lib64
+else
+TARGET_OUT_VENDOR_SHARED_LIBRARIES := $(TARGET_OUT_VENDOR)/lib
+endif
+TARGET_OUT_VENDOR_JAVA_LIBRARIES := $(TARGET_OUT_VENDOR)/framework
+TARGET_OUT_VENDOR_APPS := $(TARGET_OUT_VENDOR)/app
 TARGET_OUT_VENDOR_ETC := $(TARGET_OUT_VENDOR)/etc
 
 TARGET_OUT_UNSTRIPPED := $(PRODUCT_OUT)/symbols