diff --git a/CleanSpec.mk b/CleanSpec.mk
index ffe106c..5446ce7 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -108,6 +108,12 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES/libbcinfo_intermediates)
 
+# ICS MR2!!!!!!!!!!!!
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/*)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/APPS/*)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES/libbcinfo_intermediates)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************
diff --git a/core/Makefile b/core/Makefile
index a81c981..bff9ec0 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -603,21 +603,21 @@
 
 ifeq ($(INTERNAL_USERIMAGES_USE_EXT),true)
 INTERNAL_USERIMAGES_DEPS := $(MKEXTUSERIMG) $(MAKE_EXT4FS)
-INTERNAL_USERIMAGES_BINARY_PATHS := $(sort $(dir $(INTERNAL_USERIMAGES_DEPS)))
-
-# $(1): src directory
-# $(2): output file
-# $(3): mount point
-# $(4): ext variant (ext2, ext3, ext4)
-# $(5): size of the partition
-define build-userimage-ext-target
-  @mkdir -p $(dir $(2))
-  $(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH \
-	  $(MKEXTUSERIMG) $(INTERNAL_USERIMAGES_SPARSE_EXT_FLAG) $(1) $(2) $(4) $(3) $(5)
-endef
 else
 INTERNAL_USERIMAGES_DEPS := $(MKYAFFS2)
 endif
+INTERNAL_USERIMAGES_BINARY_PATHS := $(sort $(dir $(INTERNAL_USERIMAGES_DEPS)))
+
+# $(1): the path of the output dictionary file
+define generate-userimage-prop-dictionary
+$(if $(INTERNAL_USERIMAGES_EXT_VARIANT),$(hide) echo "fs_type=$(INTERNAL_USERIMAGES_EXT_VARIANT)" >> $(1))
+$(if $(BOARD_SYSTEMIMAGE_PARTITION_SIZE),$(hide) echo "system_size=$(BOARD_SYSTEMIMAGE_PARTITION_SIZE)" >> $(1))
+$(if $(BOARD_USERDATAIMAGE_PARTITION_SIZE),$(hide) echo "userdata_size=$(BOARD_USERDATAIMAGE_PARTITION_SIZE)" >> $(1))
+$(if $(BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE),$(hide) echo "cache_fs_type=$(BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE)" >> $(1))
+$(if $(BOARD_CACHEIMAGE_PARTITION_SIZE),$(hide) echo "cache_size=$(BOARD_CACHEIMAGE_PARTITION_SIZE)" >> $(1))
+$(if $(INTERNAL_USERIMAGES_SPARSE_EXT_FLAG),$(hide) echo "extfs_sparse_flag=$(INTERNAL_USERIMAGES_SPARSE_EXT_FLAG)" >> $(1))
+$(if $(mkyaffs2_extra_flags),$(hide) echo "mkyaffs2_extra_flags=$(mkyaffs2_extra_flags)" >> $(1))
+endef
 
 # -----------------------------------------------------------------
 # Recovery image
@@ -769,28 +769,19 @@
 endif
 
 systemimage_intermediates := \
-	$(call intermediates-dir-for,PACKAGING,systemimage)
+    $(call intermediates-dir-for,PACKAGING,systemimage)
 BUILT_SYSTEMIMAGE := $(systemimage_intermediates)/system.img
 
-ifeq ($(INTERNAL_USERIMAGES_USE_EXT),true)
-## generate an ext image
 # $(1): output file
 define build-systemimage-target
-    @echo "Target system fs image: $(1)"
-    $(call build-userimage-ext-target,$(TARGET_OUT),$(1),system,$(INTERNAL_USERIMAGES_EXT_VARIANT),$(BOARD_SYSTEMIMAGE_PARTITION_SIZE))
+  @echo "Target system fs image: $(1)"
+  @mkdir -p $(dir $(1)) $(systemimage_intermediates) && rm -rf $(systemimage_intermediates)/system_image_info.txt
+  $(call generate-userimage-prop-dictionary, $(systemimage_intermediates)/system_image_info.txt)
+  $(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH \
+      ./build/tools/releasetools/build_image.py \
+      $(TARGET_OUT) $(systemimage_intermediates)/system_image_info.txt $(1)
 endef
 
-else # INTERNAL_USERIMAGES_USE_EXT != true
-
-## generate a yaffs2 image
-# $(1): output file
-define build-systemimage-target
-    @echo "Target system fs image: $(1)"
-    @mkdir -p $(dir $(1))
-    $(hide) $(MKYAFFS2) -f $(mkyaffs2_extra_flags) $(TARGET_OUT) $(1)
-endef
-endif # INTERNAL_USERIMAGES_USE_EXT
-
 $(BUILT_SYSTEMIMAGE): $(FULL_SYSTEMIMAGE_DEPS) $(INSTALLED_FILES_FILE)
 	$(call build-systemimage-target,$@)
 
@@ -888,30 +879,23 @@
 # -----------------------------------------------------------------
 # data partition image
 INTERNAL_USERDATAIMAGE_FILES := \
-	$(filter $(TARGET_OUT_DATA)/%,$(ALL_DEFAULT_INSTALLED_MODULES))
+    $(filter $(TARGET_OUT_DATA)/%,$(ALL_DEFAULT_INSTALLED_MODULES))
 
-ifeq ($(INTERNAL_USERIMAGES_USE_EXT),true)
-## Generate an ext2 image
-define build-userdataimage-target
-    $(call pretty,"Target userdata fs image: $(INSTALLED_USERDATAIMAGE_TARGET)")
-    @mkdir -p $(TARGET_OUT_DATA)
-    $(call build-userimage-ext-target,$(TARGET_OUT_DATA),$(INSTALLED_USERDATAIMAGE_TARGET),data,$(INTERNAL_USERIMAGES_EXT_VARIANT),$(BOARD_USERDATAIMAGE_PARTITION_SIZE))
-    $(hide) $(call assert-max-image-size,$(INSTALLED_USERDATAIMAGE_TARGET),$(BOARD_USERDATAIMAGE_PARTITION_SIZE),yaffs)
-endef
-
-else # INTERNAL_USERIMAGES_USE_EXT != true
-
-## Generate a yaffs2 image
-define build-userdataimage-target
-    $(call pretty,"Target userdata fs image: $(INSTALLED_USERDATAIMAGE_TARGET)")
-    @mkdir -p $(TARGET_OUT_DATA)
-    $(hide) $(MKYAFFS2) -f $(mkyaffs2_extra_flags) $(TARGET_OUT_DATA) $(INSTALLED_USERDATAIMAGE_TARGET)
-    $(hide) $(call assert-max-image-size,$(INSTALLED_USERDATAIMAGE_TARGET),$(BOARD_USERDATAIMAGE_PARTITION_SIZE),yaffs)
-endef
-endif # INTERNAL_USERIMAGES_USE_EXT
-
+userdataimage_intermediates := \
+    $(call intermediates-dir-for,PACKAGING,userdata)
 BUILT_USERDATAIMAGE_TARGET := $(PRODUCT_OUT)/userdata.img
 
+define build-userdataimage-target
+  $(call pretty,"Target userdata fs image: $(INSTALLED_USERDATAIMAGE_TARGET)")
+  @mkdir -p $(TARGET_OUT_DATA)
+  @mkdir -p $(userdataimage_intermediates) && rm -rf $(userdataimage_intermediates)/userdata_image_info.txt
+  $(call generate-userimage-prop-dictionary, $(userdataimage_intermediates)/userdata_image_info.txt)
+  $(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH \
+      ./build/tools/releasetools/build_image.py \
+      $(TARGET_OUT_DATA) $(userdataimage_intermediates)/userdata_image_info.txt $(INSTALLED_USERDATAIMAGE_TARGET)
+  $(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) \
@@ -944,6 +928,38 @@
 
 
 # -----------------------------------------------------------------
+# cache partition image
+ifdef BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE
+INTERNAL_CACHEIMAGE_FILES := \
+    $(filter $(TARGET_OUT_CACHE)/%,$(ALL_DEFAULT_INSTALLED_MODULES))
+
+cacheimage_intermediates := \
+    $(call intermediates-dir-for,PACKAGING,cache)
+BUILT_CACHEIMAGE_TARGET := $(PRODUCT_OUT)/cache.img
+
+define build-cacheimage-target
+  $(call pretty,"Target cache fs image: $(INSTALLED_CACHEIMAGE_TARGET)")
+  @mkdir -p $(TARGET_OUT_CACHE)
+  @mkdir -p $(cacheimage_intermediates) && rm -rf $(cacheimage_intermediates)/cache_image_info.txt
+  $(call generate-userimage-prop-dictionary, $(cacheimage_intermediates)/cache_image_info.txt)
+  $(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH \
+      ./build/tools/releasetools/build_image.py \
+      $(TARGET_OUT_CACHE) $(cacheimage_intermediates)/cache_image_info.txt $(INSTALLED_CACHEIMAGE_TARGET)
+  $(hide) $(call assert-max-image-size,$(INSTALLED_CACHEIMAGE_TARGET),$(BOARD_CACHEIMAGE_PARTITION_SIZE),yaffs)
+endef
+
+# We just build this directly to the install location.
+INSTALLED_CACHEIMAGE_TARGET := $(BUILT_CACHEIMAGE_TARGET)
+$(INSTALLED_CACHEIMAGE_TARGET): $(INTERNAL_USERIMAGES_DEPS) $(INTERNAL_CACHEIMAGE_FILES)
+	$(build-cacheimage-target)
+
+.PHONY: cacheimage-nodeps
+cacheimage-nodeps: | $(INTERNAL_USERIMAGES_DEPS)
+	$(build-cacheimage-target)
+
+endif # BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE
+
+# -----------------------------------------------------------------
 # bring in the installer image generation defines if necessary
 ifeq ($(TARGET_USE_DISKINSTALLER),true)
 include bootable/diskinstaller/config.mk
@@ -1024,6 +1040,7 @@
 		$(INSTALLED_RECOVERYIMAGE_TARGET) \
 		$(INSTALLED_SYSTEMIMAGE) \
 		$(INSTALLED_USERDATAIMAGE_TARGET) \
+		$(INSTALLED_CACHEIMAGE_TARGET) \
 		$(INSTALLED_ANDROID_INFO_TXT_TARGET) \
 		$(built_ota_tools) \
 		$(APKCERTS_FILE) \
@@ -1100,23 +1117,12 @@
 ifdef BOARD_RECOVERYIMAGE_PARTITION_SIZE
 	$(hide) echo "recovery_size=$(BOARD_RECOVERYIMAGE_PARTITION_SIZE)" >> $(zip_root)/META/misc_info.txt
 endif
-ifdef BOARD_SYSTEMIMAGE_PARTITION_SIZE
-	$(hide) echo "system_size=$(BOARD_SYSTEMIMAGE_PARTITION_SIZE)" >> $(zip_root)/META/misc_info.txt
-endif
-ifdef BOARD_USERDATAIMAGE_PARTITION_SIZE
-	$(hide) echo "userdata_size=$(BOARD_USERDATAIMAGE_PARTITION_SIZE)" >> $(zip_root)/META/misc_info.txt
-endif
 	$(hide) echo "tool_extensions=$(tool_extensions)" >> $(zip_root)/META/misc_info.txt
-ifdef mkyaffs2_extra_flags
-	$(hide) echo "mkyaffs2_extra_flags=$(mkyaffs2_extra_flags)" >> $(zip_root)/META/misc_info.txt
-endif
-ifdef INTERNAL_USERIMAGES_SPARSE_EXT_FLAG
-	$(hide) echo "extfs_sparse_flag=$(INTERNAL_USERIMAGES_SPARSE_EXT_FLAG)" >> $(zip_root)/META/misc_info.txt
-endif
 	$(hide) echo "default_system_dev_certificate=$(DEFAULT_SYSTEM_DEV_CERTIFICATE)" >> $(zip_root)/META/misc_info.txt
 ifdef PRODUCT_EXTRA_RECOVERY_KEYS
 	$(hide) echo "extra_recovery_keys=$(PRODUCT_EXTRA_RECOVERY_KEYS)" >> $(zip_root)/META/misc_info.txt
 endif
+	$(call generate-userimage-prop-dictionary, $(zip_root)/META/misc_info.txt)
 	@# Zip everything up, preserving symlinks
 	$(hide) (cd $(zip_root) && zip -qry ../$(notdir $@) .)
 	@# Run fs_config on all the system, boot ramdisk, and recovery ramdisk files in the zip, and save the output
@@ -1431,6 +1437,7 @@
 			-I $(TARGET_COMMON_OUT_ROOT) \
 			-v "PLATFORM_NAME=android-$(PLATFORM_VERSION)" \
 			-v "OUT_DIR=$(OUT_DIR)" \
+			-v "HOST_OUT=$(HOST_OUT)" \
 			-v "TARGET_ARCH=$(TARGET_ARCH)" \
 			-v "TARGET_CPU_ABI=$(TARGET_CPU_ABI)" \
 			-v "DLL_EXTENSION=$(HOST_SHLIB_SUFFIX)" \
diff --git a/core/build_id.mk b/core/build_id.mk
index 70bd235..40bb35d 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -23,7 +23,7 @@
 # (like "TC1-RC5").  It must be a single word, and is
 # capitalized by convention.
 #
-BUILD_ID := MR1
+BUILD_ID := MASTER
 
 # DISPLAY_BUILD_NUMBER should only be set for development branches,
 # If set, the BUILD_NUMBER (cl) is appended to the BUILD_ID for
diff --git a/core/combo/TARGET_linux-arm.mk b/core/combo/TARGET_linux-arm.mk
index 8c89143..89f61da 100644
--- a/core/combo/TARGET_linux-arm.mk
+++ b/core/combo/TARGET_linux-arm.mk
@@ -102,7 +102,7 @@
 arch_include_dir := $(dir $(android_config_h))
 
 TARGET_GLOBAL_CFLAGS += \
-			-msoft-float -fpic \
+			-msoft-float -fpic -fPIE \
 			-ffunction-sections \
 			-fdata-sections \
 			-funwind-tables \
@@ -114,11 +114,12 @@
 			-include $(android_config_h) \
 			-I $(arch_include_dir)
 
-# This warning causes dalvik not to build with gcc 4.6 and -Werror.
+# This warning causes dalvik not to build with gcc 4.6.x and -Werror.
 # We cannot turn it off blindly since the option is not available
-# in gcc-4.4.x
-ifneq ($(filter 4.6.0%, $(shell $(TARGET_CC) --version)),)
-TARGET_GLOBAL_CFLAGS += -Wno-unused-but-set-variable
+# in gcc-4.4.x.  We also want to disable sincos optimization globally
+# by turning off the builtin sin function.
+ifneq ($(filter 4.6.%, $(shell $(TARGET_CC) --version)),)
+TARGET_GLOBAL_CFLAGS += -Wno-unused-but-set-variable -fno-builtin-sin
 endif
 
 # This is to avoid the dreaded warning compiler message:
@@ -266,7 +267,7 @@
 endef
 
 define transform-o-to-executable-inner
-$(hide) $(PRIVATE_CXX) -nostdlib -Bdynamic -Wl,-T,$(BUILD_SYSTEM)/armelf.x \
+$(hide) $(PRIVATE_CXX) -nostdlib -Bdynamic -fPIE -pie \
 	-Wl,-dynamic-linker,/system/bin/linker \
     -Wl,--gc-sections \
 	-Wl,-z,nocopyreloc \
@@ -287,7 +288,7 @@
 endef
 
 define transform-o-to-static-executable-inner
-$(hide) $(PRIVATE_CXX) -nostdlib -Bstatic -Wl,-T,$(BUILD_SYSTEM)/armelf.x \
+$(hide) $(PRIVATE_CXX) -nostdlib -Bstatic \
     -Wl,--gc-sections \
 	-o $@ \
 	$(TARGET_GLOBAL_LD_DIRS) \
diff --git a/core/combo/TARGET_linux-x86.mk b/core/combo/TARGET_linux-x86.mk
index 0fb6edc..f38c3d3 100644
--- a/core/combo/TARGET_linux-x86.mk
+++ b/core/combo/TARGET_linux-x86.mk
@@ -73,7 +73,7 @@
 			-Wa,--noexecstack \
 			-Werror=format-security \
 			-Wstrict-aliasing=2 \
-			-fPIC \
+			-fPIC -fPIE \
 			-ffunction-sections \
 			-finline-functions \
 			-finline-limit=300 \
@@ -158,6 +158,7 @@
 	-nostdlib -Bdynamic \
 	-Wl,-dynamic-linker,/system/bin/linker \
 	-Wl,-z,nocopyreloc \
+	-fPIE -pie \
 	-o $@ \
 	$(TARGET_GLOBAL_LD_DIRS) \
 	-Wl,-rpath-link=$(TARGET_OUT_INTERMEDIATE_LIBRARIES) \
diff --git a/core/config.mk b/core/config.mk
index 41e60ea..d486ed3 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -117,7 +117,10 @@
 # If this file doesn't exist, the environemnt variables will
 # be used, and if that doesn't work, then the default is an
 # arm build
--include $(TOPDIR)buildspec.mk
+ifndef ANDROID_BUILDSPEC
+ANDROID_BUILDSPEC := $(TOPDIR)buildspec.mk
+endif
+-include $(ANDROID_BUILDSPEC)
 
 # ---------------------------------------------------------------
 # Define most of the global variables.  These are the ones that
diff --git a/core/dumpvar.mk b/core/dumpvar.mk
index e0de464..c3fb5b4 100644
--- a/core/dumpvar.mk
+++ b/core/dumpvar.mk
@@ -5,11 +5,17 @@
 
 ABP:=$(PWD)/$(HOST_OUT_EXECUTABLES)
 
-# Add the toolchain bin dir if it actually exists
+# Add the ARM toolchain bin dir if it actually exists
 ifneq ($(wildcard $(PWD)/prebuilt/$(HOST_PREBUILT_TAG)/toolchain/arm-linux-androideabi-4.4.x/bin),)
 	# this should be copied to HOST_OUT_EXECUTABLES instead
 	ABP:=$(ABP):$(PWD)/prebuilt/$(HOST_PREBUILT_TAG)/toolchain/arm-linux-androideabi-4.4.x/bin
 endif
+
+# Add the x86 toolchain bin dir if it actually exists
+ifneq ($(wildcard $(PWD)/prebuilt/$(HOST_PREBUILT_TAG)/toolchain/i686-android-linux-4.4.3/bin),)
+	# this should be copied to HOST_OUT_EXECUTABLES instead
+	ABP:=$(ABP):$(PWD)/prebuilt/$(HOST_PREBUILT_TAG)/toolchain/i686-android-linux-4.4.3/bin
+endif
 ANDROID_BUILD_PATHS := $(ABP)
 ANDROID_PREBUILTS := prebuilt/$(HOST_PREBUILT_TAG)
 
diff --git a/core/envsetup.mk b/core/envsetup.mk
index c3ae3b0..8457880 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -102,6 +102,14 @@
   HOST_PREBUILT_TAG := $(HOST_OS)-$(HOST_ARCH)
 endif
 
+# TARGET_COPY_OUT_* are all relative to the staging directory, ie PRODUCT_OUT.
+# Define them here so they can be used in product config files.
+TARGET_COPY_OUT_SYSTEM := system
+TARGET_COPY_OUT_DATA := data
+TARGET_COPY_OUT_VENDOR := system/vendor
+TARGET_COPY_OUT_ROOT := root
+TARGET_COPY_OUT_RECOVERY := recovery
+
 # Read the product specs so we an get TARGET_DEVICE and other
 # variables that we need in order to locate the output files.
 include $(BUILD_SYSTEM)/product_config.mk
@@ -182,7 +190,7 @@
 TARGET_OUT_INTERMEDIATE_LIBRARIES := $(TARGET_OUT_INTERMEDIATES)/lib
 TARGET_OUT_COMMON_INTERMEDIATES := $(TARGET_COMMON_OUT_ROOT)/obj
 
-TARGET_OUT := $(PRODUCT_OUT)/system
+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:= $(TARGET_OUT)/lib
@@ -195,7 +203,7 @@
 TARGET_OUT_NOTICE_FILES:=$(TARGET_OUT_INTERMEDIATES)/NOTICE_FILES
 TARGET_OUT_FAKE := $(PRODUCT_OUT)/fake_packages
 
-TARGET_OUT_DATA := $(PRODUCT_OUT)/data
+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_JAVA_LIBRARIES)
@@ -206,7 +214,9 @@
 TARGET_OUT_DATA_STATIC_LIBRARIES:= $(TARGET_OUT_STATIC_LIBRARIES)
 TARGET_OUT_DATA_NATIVE_TESTS := $(TARGET_OUT_DATA)/nativetest
 
-TARGET_OUT_VENDOR := $(PRODUCT_OUT)/system/vendor
+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
@@ -221,13 +231,13 @@
 TARGET_ROOT_OUT_SBIN_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/sbin
 TARGET_ROOT_OUT_BIN_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/bin
 
-TARGET_ROOT_OUT := $(PRODUCT_OUT)/root
+TARGET_ROOT_OUT := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_ROOT)
 TARGET_ROOT_OUT_BIN := $(TARGET_ROOT_OUT)/bin
 TARGET_ROOT_OUT_SBIN := $(TARGET_ROOT_OUT)/sbin
 TARGET_ROOT_OUT_ETC := $(TARGET_ROOT_OUT)/etc
 TARGET_ROOT_OUT_USR := $(TARGET_ROOT_OUT)/usr
 
-TARGET_RECOVERY_OUT := $(PRODUCT_OUT)/recovery
+TARGET_RECOVERY_OUT := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_RECOVERY)
 TARGET_RECOVERY_ROOT_OUT := $(TARGET_RECOVERY_OUT)/root
 
 TARGET_SYSLOADER_OUT := $(PRODUCT_OUT)/sysloader
diff --git a/core/main.mk b/core/main.mk
index 569d4dc..97d3d7e 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -441,7 +441,6 @@
 	sdk/ide_common \
 	sdk/jarutils \
 	sdk/layoutlib_api \
-	sdk/layoutopt \
 	sdk/ninepatch \
 	sdk/rule_api \
 	sdk/lint \
@@ -744,6 +743,9 @@
 .PHONY: userdatatarball
 userdatatarball: $(INSTALLED_USERDATATARBALL_TARGET)
 
+.PHONY: cacheimage
+cacheimage: $(INSTALLED_CACHEIMAGE_TARGET)
+
 .PHONY: bootimage
 bootimage: $(INSTALLED_BOOTIMAGE_TARGET)
 
@@ -758,6 +760,7 @@
 	$(INSTALLED_BOOTIMAGE_TARGET) \
 	$(INSTALLED_RECOVERYIMAGE_TARGET) \
 	$(INSTALLED_USERDATAIMAGE_TARGET) \
+	$(INSTALLED_CACHEIMAGE_TARGET) \
 	$(INSTALLED_FILES_FILE)
 
 # dist_files only for putting your library into the dist directory with a full build.
diff --git a/core/product.mk b/core/product.mk
index f48d2be..f7c772f 100644
--- a/core/product.mk
+++ b/core/product.mk
@@ -227,6 +227,8 @@
 	BOARD_RECOVERYIMAGE_PARTITION_SIZE \
 	BOARD_SYSTEMIMAGE_PARTITION_SIZE \
 	BOARD_USERDATAIMAGE_PARTITION_SIZE \
+	BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE \
+	BOARD_CACHEIMAGE_PARTITION_SIZE \
 	BOARD_FLASH_BLOCK_SIZE \
 	BOARD_SYSTEMIMAGE_PARTITION_SIZE \
 	BOARD_VENDOR_QCOM_GPS_LOC_API_HARDWARE \
diff --git a/core/user_tags.mk b/core/user_tags.mk
index 2e7017e..b88e541 100644
--- a/core/user_tags.mk
+++ b/core/user_tags.mk
@@ -171,7 +171,6 @@
 	layoutlib_api \
 	layoutlib_create \
 	layoutlib_utils \
-	layoutopt \
 	liba2dp \
 	libabi \
 	libandroid \
@@ -494,7 +493,6 @@
 	traceview \
 	tune2fs \
 	tune2fs_host \
-	uix \
 	usbtest \
 	vdc \
 	vm-tests \
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 7f6db0c..8553982 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -41,7 +41,7 @@
   # which is the version that we reveal to the end user.
   # Update this value when the platform version changes (rather
   # than overriding it somewhere else).  Can be an arbitrary string.
-  PLATFORM_VERSION := 4.1
+  PLATFORM_VERSION := IceCreamSandwichMR2
 endif
 
 ifeq "" "$(PLATFORM_SDK_VERSION)"
@@ -59,7 +59,7 @@
 ifeq "" "$(PLATFORM_VERSION_CODENAME)"
   # This is the current development code-name, if the build is not a final
   # release build.  If this is a final release build, it is simply "REL".
-  PLATFORM_VERSION_CODENAME := REL
+  PLATFORM_VERSION_CODENAME := IceCreamSandwichMR2
 endif
 
 ifeq "" "$(DEFAULT_APP_TARGET_SDK)"
diff --git a/envsetup.sh b/envsetup.sh
index bab2d25..61c1e7f 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -704,6 +704,14 @@
    local OUT_SO_SYMBOLS=$(get_abs_build_var TARGET_OUT_SHARED_LIBRARIES_UNSTRIPPED)
    local OUT_EXE_SYMBOLS=$(get_abs_build_var TARGET_OUT_EXECUTABLES_UNSTRIPPED)
    local PREBUILTS=$(get_abs_build_var ANDROID_PREBUILTS)
+   local ARCH=$(get_build_var TARGET_ARCH)
+   local GDB
+   case "$ARCH" in
+       x86) GDB=i686-android-linux-gdb;;
+       arm) GDB=arm-linux-androideabi-gdb;;
+       *) echo "Unknown arch $ARCH"; return 1;;
+   esac
+
    if [ "$OUT_ROOT" -a "$PREBUILTS" ]; then
        local EXE="$1"
        if [ "$EXE" ] ; then
@@ -744,7 +752,7 @@
        echo >>"$OUT_ROOT/gdbclient.cmds" "target remote $PORT"
        echo >>"$OUT_ROOT/gdbclient.cmds" ""
 
-       arm-linux-androideabi-gdb -x "$OUT_ROOT/gdbclient.cmds" "$OUT_EXE_SYMBOLS/$EXE"
+       $GDB -x "$OUT_ROOT/gdbclient.cmds" "$OUT_EXE_SYMBOLS/$EXE"
   else
        echo "Unable to determine build system output dir."
    fi
@@ -908,7 +916,7 @@
     echo "Running hat on $localFile"
     echo "View the output by pointing your browser at http://localhost:7000/"
     echo ""
-    hat $localFile
+    hat -JXmx512m $localFile
 }
 
 function getbugreports()
diff --git a/target/product/sdk.mk b/target/product/sdk.mk
index ceb1898..d2f4c09 100644
--- a/target/product/sdk.mk
+++ b/target/product/sdk.mk
@@ -77,7 +77,6 @@
 	ddms \
 	hierarchyviewer \
 	draw9patch \
-	layoutopt \
 	traceview \
 	android \
 	dexdump \
@@ -95,8 +94,6 @@
 	ddmuilib \
 	draw9patch \
 	hierarchyviewer \
-	layoutopt \
-	uix \
 	traceview \
 	anttasks \
 	sdklib \
diff --git a/tools/releasetools/build_image.py b/tools/releasetools/build_image.py
new file mode 100755
index 0000000..15acddc
--- /dev/null
+++ b/tools/releasetools/build_image.py
@@ -0,0 +1,139 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2011 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.
+
+"""
+Build image output_image_file from input_directory and properties_file.
+
+Usage:  build_image input_directory properties_file output_image_file
+
+"""
+import os
+import subprocess
+import sys
+
+
+def BuildImage(in_dir, prop_dict, out_file):
+  """Build an image to out_file from in_dir with property prop_dict.
+
+  Args:
+    in_dir: path of input directory.
+    prop_dict: property dictionary.
+    out_file: path of the output image file.
+
+  Returns:
+    True iff the image is built successfully.
+  """
+  build_command = []
+  fs_type = prop_dict.get("fs_type", "")
+  if fs_type.startswith("ext"):
+    build_command = ["mkuserimg.sh"]
+    if "extfs_sparse_flag" in prop_dict:
+      build_command.append(prop_dict["extfs_sparse_flag"])
+    build_command.extend([in_dir, out_file, fs_type,
+                          prop_dict["mount_point"]])
+    if "partition_size" in prop_dict:
+      build_command.append(prop_dict["partition_size"])
+  else:
+    build_command = ["mkyaffs2image", "-f"]
+    if prop_dict.get("mkyaffs2_extra_flags", None):
+      build_command.extend(prop_dict["mkyaffs2_extra_flags"].split())
+    build_command.append(in_dir)
+    build_command.append(out_file)
+
+  print "Running: ", " ".join(build_command)
+  p = subprocess.Popen(build_command);
+  p.communicate()
+  return p.returncode == 0
+
+
+def ImagePropFromGlobalDict(glob_dict, mount_point):
+  """Build an image property dictionary from the global dictionary.
+
+  Args:
+    glob_dict: the global dictionary from the build system.
+    mount_point: such as "system", "data" etc.
+  """
+  d = {}
+
+  def copy_prop(src_p, dest_p):
+    if src_p in glob_dict:
+      d[dest_p] = str(glob_dict[src_p])
+
+  common_props = (
+      "extfs_sparse_flag",
+      "mkyaffs2_extra_flags",
+      )
+  for p in common_props:
+    copy_prop(p, p)
+
+  d["mount_point"] = mount_point
+  if mount_point == "system":
+    copy_prop("fs_type", "fs_type")
+    copy_prop("system_size", "partition_size")
+  elif mount_point == "data":
+    copy_prop("fs_type", "fs_type")
+    copy_prop("userdata_size", "partition_size")
+  elif mount_point == "cache":
+    copy_prop("cache_fs_type", "fs_type")
+    copy_prop("cache_size", "partition_size")
+
+  return d
+
+
+def LoadGlobalDict(filename):
+  """Load "name=value" pairs from filename"""
+  d = {}
+  f = open(filename)
+  for line in f:
+    line = line.strip()
+    if not line or line.startswith("#"):
+      continue
+    k, v = line.split("=", 1)
+    d[k] = v
+  f.close()
+  return d
+
+
+def main(argv):
+  if len(argv) != 3:
+    print __doc__
+    sys.exit(1)
+
+  in_dir = argv[0]
+  glob_dict_file = argv[1]
+  out_file = argv[2]
+
+  glob_dict = LoadGlobalDict(glob_dict_file)
+  image_filename = os.path.basename(out_file)
+  mount_point = ""
+  if image_filename == "system.img":
+    mount_point = "system"
+  elif image_filename == "userdata.img":
+    mount_point = "data"
+  elif image_filename == "cache.img":
+    mount_point = "cache"
+  else:
+    print >> sys.stderr, "error: unknown image file name ", image_filename
+    exit(1)
+
+  image_properties = ImagePropFromGlobalDict(glob_dict, mount_point)
+  if not BuildImage(in_dir, image_properties, out_file):
+    print >> sys.stderr, "error: failed to build %s from %s" % (out_file, in_dir)
+    exit(1)
+
+
+if __name__ == '__main__':
+  main(sys.argv[1:])
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index 4957354..1049591 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -138,6 +138,7 @@
   makeint("blocksize")
   makeint("system_size")
   makeint("userdata_size")
+  makeint("cache_size")
   makeint("recovery_size")
   makeint("boot_size")
 
diff --git a/tools/releasetools/img_from_target_files b/tools/releasetools/img_from_target_files
index c5b9886..002e6e6 100755
--- a/tools/releasetools/img_from_target_files
+++ b/tools/releasetools/img_from_target_files
@@ -47,6 +47,7 @@
 if not hasattr(os, "SEEK_SET"):
   os.SEEK_SET = 0
 
+import build_image
 import common
 
 OPTIONS = common.OPTIONS
@@ -64,27 +65,13 @@
   os.mkdir(user_dir)
   img = tempfile.NamedTemporaryFile()
 
-  build_command = []
+  image_props = build_image.ImagePropFromGlobalDict(OPTIONS.info_dict,
+                                                    "data")
   fstab = OPTIONS.info_dict["fstab"]
-  if fstab and fstab["/data"].fs_type.startswith("ext"):
-    build_command = ["mkuserimg.sh"]
-    if "extfs_sparse_flag" in OPTIONS.info_dict:
-      build_command.append(OPTIONS.info_dict["extfs_sparse_flag"])
-    build_command.extend([user_dir, img.name,
-                     fstab["/data"].fs_type, "data"])
-    if "userdata_size" in OPTIONS.info_dict:
-      build_command.append(str(OPTIONS.info_dict["userdata_size"]))
-  else:
-    build_command = ["mkyaffs2image", "-f"]
-    extra = OPTIONS.info_dict.get("mkyaffs2_extra_flags", None)
-    if extra:
-      build_command.extend(extra.split())
-    build_command.append(user_dir)
-    build_command.append(img.name)
-
-  p = common.Run(build_command);
-  p.communicate()
-  assert p.returncode == 0, "build userdata.img image failed"
+  if fstab:
+    image_props["fs_type" ] = fstab["/data"].fs_type
+  succ = build_image.BuildImage(user_dir, image_props, img.name)
+  assert succ, "build userdata.img image failed"
 
   common.CheckSize(img.name, "userdata.img", OPTIONS.info_dict)
   output_zip.write(img.name, "userdata.img")
@@ -93,6 +80,38 @@
   os.rmdir(temp_dir)
 
 
+def AddCache(output_zip):
+  """Create an empty cache image and store it in output_zip."""
+
+  image_props = build_image.ImagePropFromGlobalDict(OPTIONS.info_dict,
+                                                    "cache")
+  # The build system has to explicitly request for cache.img.
+  if "fs_type" not in image_props:
+    return
+
+  print "creating cache.img..."
+
+  # The name of the directory it is making an image out of matters to
+  # mkyaffs2image.  So we create a temp dir, and within it we create an
+  # empty dir named "cache", and build the image from that.
+  temp_dir = tempfile.mkdtemp()
+  user_dir = os.path.join(temp_dir, "cache")
+  os.mkdir(user_dir)
+  img = tempfile.NamedTemporaryFile()
+
+  fstab = OPTIONS.info_dict["fstab"]
+  if fstab:
+    image_props["fs_type" ] = fstab["/cache"].fs_type
+  succ = build_image.BuildImage(user_dir, image_props, img.name)
+  assert succ, "build cache.img image failed"
+
+  common.CheckSize(img.name, "cache.img", OPTIONS.info_dict)
+  output_zip.write(img.name, "cache.img")
+  img.close()
+  os.rmdir(user_dir)
+  os.rmdir(temp_dir)
+
+
 def AddSystem(output_zip):
   """Turn the contents of SYSTEM into a system image and store it in
   output_zip."""
@@ -115,28 +134,14 @@
     if (e.errno == errno.EEXIST):
       pass
 
-  build_command = []
+  image_props = build_image.ImagePropFromGlobalDict(OPTIONS.info_dict,
+                                                    "system")
   fstab = OPTIONS.info_dict["fstab"]
-  if fstab and fstab["/system"].fs_type.startswith("ext"):
-
-    build_command = ["mkuserimg.sh"]
-    if "extfs_sparse_flag" in OPTIONS.info_dict:
-      build_command.append(OPTIONS.info_dict["extfs_sparse_flag"])
-    build_command.extend([os.path.join(OPTIONS.input_tmp, "system"), img.name,
-                     fstab["/system"].fs_type, "system"])
-    if "system_size" in OPTIONS.info_dict:
-      build_command.append(str(OPTIONS.info_dict["system_size"]))
-  else:
-    build_command = ["mkyaffs2image", "-f"]
-    extra = OPTIONS.info_dict.get("mkyaffs2_extra_flags", None)
-    if extra:
-      build_command.extend(extra.split())
-    build_command.append(os.path.join(OPTIONS.input_tmp, "system"))
-    build_command.append(img.name)
-
-  p = common.Run(build_command)
-  p.communicate()
-  assert p.returncode == 0, "build system.img image failed"
+  if fstab:
+    image_props["fs_type" ] = fstab["/system"].fs_type
+  succ = build_image.BuildImage(os.path.join(OPTIONS.input_tmp, "system"),
+                                image_props, img.name)
+  assert succ, "build system.img image failed"
 
   img.seek(os.SEEK_SET, 0)
   data = img.read()
@@ -190,6 +195,7 @@
   if not bootable_only:
     AddSystem(output_zip)
     AddUserdata(output_zip)
+    AddCache(output_zip)
     CopyInfo(output_zip)
 
   print "cleaning up..."
diff --git a/tools/zipalign/ZipEntry.cpp b/tools/zipalign/ZipEntry.cpp
index bed0333..cd9e332 100644
--- a/tools/zipalign/ZipEntry.cpp
+++ b/tools/zipalign/ZipEntry.cpp
@@ -42,7 +42,7 @@
     long posn;
     bool hasDD;
 
-    //LOGV("initFromCDE ---\n");
+    //ALOGV("initFromCDE ---\n");
 
     /* read the CDE */
     result = mCDE.read(fp);
@@ -280,50 +280,50 @@
 bool ZipEntry::compareHeaders(void) const
 {
     if (mCDE.mVersionToExtract != mLFH.mVersionToExtract) {
-        LOGV("cmp: VersionToExtract\n");
+        ALOGV("cmp: VersionToExtract\n");
         return false;
     }
     if (mCDE.mGPBitFlag != mLFH.mGPBitFlag) {
-        LOGV("cmp: GPBitFlag\n");
+        ALOGV("cmp: GPBitFlag\n");
         return false;
     }
     if (mCDE.mCompressionMethod != mLFH.mCompressionMethod) {
-        LOGV("cmp: CompressionMethod\n");
+        ALOGV("cmp: CompressionMethod\n");
         return false;
     }
     if (mCDE.mLastModFileTime != mLFH.mLastModFileTime) {
-        LOGV("cmp: LastModFileTime\n");
+        ALOGV("cmp: LastModFileTime\n");
         return false;
     }
     if (mCDE.mLastModFileDate != mLFH.mLastModFileDate) {
-        LOGV("cmp: LastModFileDate\n");
+        ALOGV("cmp: LastModFileDate\n");
         return false;
     }
     if (mCDE.mCRC32 != mLFH.mCRC32) {
-        LOGV("cmp: CRC32\n");
+        ALOGV("cmp: CRC32\n");
         return false;
     }
     if (mCDE.mCompressedSize != mLFH.mCompressedSize) {
-        LOGV("cmp: CompressedSize\n");
+        ALOGV("cmp: CompressedSize\n");
         return false;
     }
     if (mCDE.mUncompressedSize != mLFH.mUncompressedSize) {
-        LOGV("cmp: UncompressedSize\n");
+        ALOGV("cmp: UncompressedSize\n");
         return false;
     }
     if (mCDE.mFileNameLength != mLFH.mFileNameLength) {
-        LOGV("cmp: FileNameLength\n");
+        ALOGV("cmp: FileNameLength\n");
         return false;
     }
 #if 0       // this seems to be used for padding, not real data
     if (mCDE.mExtraFieldLength != mLFH.mExtraFieldLength) {
-        LOGV("cmp: ExtraFieldLength\n");
+        ALOGV("cmp: ExtraFieldLength\n");
         return false;
     }
 #endif
     if (mCDE.mFileName != NULL) {
         if (strcmp((char*) mCDE.mFileName, (char*) mLFH.mFileName) != 0) {
-            LOGV("cmp: FileName\n");
+            ALOGV("cmp: FileName\n");
             return false;
         }
     }
diff --git a/tools/zipalign/ZipFile.cpp b/tools/zipalign/ZipFile.cpp
index 62c9383..9e5ee42 100644
--- a/tools/zipalign/ZipFile.cpp
+++ b/tools/zipalign/ZipFile.cpp
@@ -253,7 +253,7 @@
         if (buf[i] == 0x50 &&
             ZipEntry::getLongLE(&buf[i]) == EndOfCentralDir::kSignature)
         {
-            LOGV("+++ Found EOCD at buf+%d\n", i);
+            ALOGV("+++ Found EOCD at buf+%d\n", i);
             break;
         }
     }
@@ -303,7 +303,7 @@
     /*
      * Loop through and read the central dir entries.
      */
-    LOGV("Scanning %d entries...\n", mEOCD.mTotalNumEntries);
+    ALOGV("Scanning %d entries...\n", mEOCD.mTotalNumEntries);
     int entry;
     for (entry = 0; entry < mEOCD.mTotalNumEntries; entry++) {
         ZipEntry* pEntry = new ZipEntry;
@@ -334,7 +334,7 @@
             result = UNKNOWN_ERROR;
             goto bail;
         }
-        LOGV("+++ EOCD read check passed\n");
+        ALOGV("+++ EOCD read check passed\n");
     }
 
 bail:
@@ -799,7 +799,7 @@
 
         /* only read if the input buffer is empty */
         if (zstream.avail_in == 0 && !atEof) {
-            LOGV("+++ reading %d bytes\n", (int)kBufSize);
+            ALOGV("+++ reading %d bytes\n", (int)kBufSize);
             if (data) {
                 getSize = size > kBufSize ? kBufSize : size;
                 memcpy(inBuf, data, getSize);
@@ -813,7 +813,7 @@
                 }
             }
             if (getSize < kBufSize) {
-                LOGV("+++  got %d bytes, EOF reached\n",
+                ALOGV("+++  got %d bytes, EOF reached\n",
                     (int)getSize);
                 atEof = true;
             }
@@ -840,7 +840,7 @@
         if (zstream.avail_out == 0 ||
             (zerr == Z_STREAM_END && zstream.avail_out != (uInt) kBufSize))
         {
-            LOGV("+++ writing %d bytes\n", (int) (zstream.next_out - outBuf));
+            ALOGV("+++ writing %d bytes\n", (int) (zstream.next_out - outBuf));
             if (fwrite(outBuf, 1, zstream.next_out - outBuf, dstFp) !=
                 (size_t)(zstream.next_out - outBuf))
             {