################################################################################
  #
  # uboot
  #
  ################################################################################
  
  UBOOT_VERSION = $(call qstrip,$(BR2_TARGET_UBOOT_VERSION))
  UBOOT_BOARD_NAME = $(call qstrip,$(BR2_TARGET_UBOOT_BOARDNAME))
  
  UBOOT_LICENSE = GPLv2+
  UBOOT_LICENSE_FILES = Licenses/gpl-2.0.txt
  
  UBOOT_INSTALL_IMAGES = YES
  
  ifeq ($(UBOOT_VERSION),custom)
  # Handle custom U-Boot tarballs as specified by the configuration
  UBOOT_TARBALL = $(call qstrip,$(BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION))
  UBOOT_SITE = $(patsubst %/,%,$(dir $(UBOOT_TARBALL)))
  UBOOT_SOURCE = $(notdir $(UBOOT_TARBALL))
  BR_NO_CHECK_HASH_FOR += $(UBOOT_SOURCE)
  else ifeq ($(BR2_TARGET_UBOOT_CUSTOM_GIT),y)
  UBOOT_SITE = $(call qstrip,$(BR2_TARGET_UBOOT_CUSTOM_REPO_URL))
  UBOOT_SITE_METHOD = git
  else ifeq ($(BR2_TARGET_UBOOT_CUSTOM_HG),y)
  UBOOT_SITE = $(call qstrip,$(BR2_TARGET_UBOOT_CUSTOM_REPO_URL))
  UBOOT_SITE_METHOD = hg
  else ifeq ($(BR2_TARGET_UBOOT_CUSTOM_SVN),y)
  UBOOT_SITE = $(call qstrip,$(BR2_TARGET_UBOOT_CUSTOM_REPO_URL))
  UBOOT_SITE_METHOD = svn
  else
  # Handle stable official U-Boot versions
  UBOOT_SITE = ftp://ftp.denx.de/pub/u-boot
  UBOOT_SOURCE = u-boot-$(UBOOT_VERSION).tar.bz2
  ifeq ($(BR2_TARGET_UBOOT_CUSTOM_VERSION),y)
  BR_NO_CHECK_HASH_FOR += $(UBOOT_SOURCE)
  endif
  endif
  
  ifeq ($(BR2_TARGET_UBOOT_FORMAT_ELF),y)
  UBOOT_BIN = u-boot
  # To make elf usable for debuging on ARC use special target
  ifeq ($(BR2_arc),y)
  UBOOT_MAKE_TARGET = mdbtrick
  endif
  else ifeq ($(BR2_TARGET_UBOOT_FORMAT_KWB),y)
  UBOOT_BIN = u-boot.kwb
  UBOOT_MAKE_TARGET = $(UBOOT_BIN)
  else ifeq ($(BR2_TARGET_UBOOT_FORMAT_AIS),y)
  UBOOT_BIN = u-boot.ais
  UBOOT_MAKE_TARGET = $(UBOOT_BIN)
  else ifeq ($(BR2_TARGET_UBOOT_FORMAT_LDR),y)
  UBOOT_BIN = u-boot.ldr
  else ifeq ($(BR2_TARGET_UBOOT_FORMAT_NAND_BIN),y)
  UBOOT_BIN = u-boot-nand.bin
  else ifeq ($(BR2_TARGET_UBOOT_FORMAT_DTB_IMG),y)
  UBOOT_BIN = u-boot-dtb.img
  UBOOT_MAKE_TARGET = all $(UBOOT_BIN)
  else ifeq ($(BR2_TARGET_UBOOT_FORMAT_IMG),y)
  UBOOT_BIN = u-boot.img
  else ifeq ($(BR2_TARGET_UBOOT_FORMAT_IMX),y)
  UBOOT_BIN = u-boot.imx
  else ifeq ($(BR2_TARGET_UBOOT_FORMAT_SB),y)
  UBOOT_BIN = u-boot.sb
  UBOOT_MAKE_TARGET = $(UBOOT_BIN)
  # mxsimage needs OpenSSL
  UBOOT_DEPENDENCIES += host-elftosb host-openssl
  else ifeq ($(BR2_TARGET_UBOOT_FORMAT_SD),y)
  # BootStream (.sb) is generated by U-Boot, we convert it to SD format
  UBOOT_BIN = u-boot.sd
  UBOOT_MAKE_TARGET = u-boot.sb
  UBOOT_DEPENDENCIES += host-elftosb host-openssl
  else ifeq ($(BR2_TARGET_UBOOT_FORMAT_NAND),y)
  UBOOT_BIN = u-boot.nand
  UBOOT_MAKE_TARGET = u-boot.sb
  UBOOT_DEPENDENCIES += host-elftosb host-openssl
  else ifeq ($(BR2_TARGET_UBOOT_FORMAT_CUSTOM),y)
  UBOOT_BIN = $(call qstrip,$(BR2_TARGET_UBOOT_FORMAT_CUSTOM_NAME))
  else
  UBOOT_BIN = u-boot.bin
  UBOOT_BIN_IFT = $(UBOOT_BIN).ift
  endif
  
  # The kernel calls AArch64 'arm64', but U-Boot calls it just 'arm', so
  # we have to special case it. Similar for i386/x86_64 -> x86
  ifeq ($(KERNEL_ARCH),arm64)
  UBOOT_ARCH = arm
  else ifneq ($(filter $(KERNEL_ARCH),i386 x86_64),)
  UBOOT_ARCH = x86
  else
  UBOOT_ARCH = $(KERNEL_ARCH)
  endif
  
  UBOOT_MAKE_OPTS += \
  	CROSS_COMPILE="$(TARGET_CROSS)" \
  	ARCH=$(UBOOT_ARCH) \
  	HOSTCC="$(HOSTCC) $(HOST_CFLAGS)" \
  	HOSTLDFLAGS="$(HOST_LDFLAGS)"
  
  ifeq ($(BR2_TARGET_UBOOT_NEEDS_DTC),y)
  UBOOT_DEPENDENCIES += host-dtc
  endif
  
  # prior to u-boot 2013.10 the license info was in COPYING. Copy it so
  # legal-info finds it
  define UBOOT_COPY_OLD_LICENSE_FILE
  	if [ -f $(@D)/COPYING ]; then \
  		$(INSTALL) -m 0644 -D $(@D)/COPYING $(@D)/Licenses/gpl-2.0.txt; \
  	fi
  endef
  
  UBOOT_POST_EXTRACT_HOOKS += UBOOT_COPY_OLD_LICENSE_FILE
  UBOOT_POST_RSYNC_HOOKS += UBOOT_COPY_OLD_LICENSE_FILE
  
  # Analogous code exists in linux/linux.mk. Basically, the generic
  # package infrastructure handles downloading and applying remote
  # patches. Local patches are handled depending on whether they are
  # directories or files.
  UBOOT_PATCHES = $(call qstrip,$(BR2_TARGET_UBOOT_PATCH))
  UBOOT_PATCH = $(filter ftp://% http://% https://%,$(UBOOT_PATCHES))
  
  define UBOOT_APPLY_LOCAL_PATCHES
  	for p in $(filter-out ftp://% http://% https://%,$(UBOOT_PATCHES)) ; do \
  		if test -d $$p ; then \
  			$(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
  		else \
  			$(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
  		fi \
  	done
  endef
  UBOOT_POST_PATCH_HOOKS += UBOOT_APPLY_LOCAL_PATCHES
  
  ifeq ($(BR2_TARGET_UBOOT_BUILD_SYSTEM_LEGACY),y)
  define UBOOT_CONFIGURE_CMDS
  	$(TARGET_CONFIGURE_OPTS) 	\
  		$(MAKE) -C $(@D) $(UBOOT_MAKE_OPTS)		\
  		$(UBOOT_BOARD_NAME)_config
  endef
  else ifeq ($(BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG),y)
  ifeq ($(BR2_TARGET_UBOOT_USE_DEFCONFIG),y)
  UBOOT_KCONFIG_DEFCONFIG = $(call qstrip,$(BR2_TARGET_UBOOT_BOARD_DEFCONFIG))_defconfig
  else ifeq ($(BR2_TARGET_UBOOT_USE_CUSTOM_CONFIG),y)
  UBOOT_KCONFIG_FILE = $(call qstrip,$(BR2_TARGET_UBOOT_CUSTOM_CONFIG_FILE))
  endif # BR2_TARGET_UBOOT_USE_DEFCONFIG
  
  UBOOT_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
  UBOOT_KCONFIG_OPTS = $(UBOOT_MAKE_OPTS)
  endif # BR2_TARGET_UBOOT_BUILD_SYSTEM_LEGACY
  
  define UBOOT_BUILD_CMDS
  	$(TARGET_CONFIGURE_OPTS) 	\
  		$(MAKE) -C $(@D) $(UBOOT_MAKE_OPTS) 		\
  		$(UBOOT_MAKE_TARGET)
  	$(if $(BR2_TARGET_UBOOT_FORMAT_SD),
  		$(@D)/tools/mxsboot sd $(@D)/u-boot.sb $(@D)/u-boot.sd)
  	$(if $(BR2_TARGET_UBOOT_FORMAT_NAND),
  		$(@D)/tools/mxsboot \
  			-w $(BR2_TARGET_UBOOT_FORMAT_NAND_PAGE_SIZE)	\
  			-o $(BR2_TARGET_UBOOT_FORMAT_NAND_OOB_SIZE)	\
  			-e $(BR2_TARGET_UBOOT_FORMAT_NAND_ERASE_SIZE)	\
  			nand $(@D)/u-boot.sb $(@D)/u-boot.nand)
  endef
  
  define UBOOT_BUILD_OMAP_IFT
  	$(HOST_DIR)/usr/bin/gpsign -f $(@D)/u-boot.bin \
  		-c $(call qstrip,$(BR2_TARGET_UBOOT_OMAP_IFT_CONFIG))
  endef
  
  define UBOOT_INSTALL_IMAGES_CMDS
  	cp -dpf $(@D)/$(UBOOT_BIN) $(BINARIES_DIR)/
  	$(if $(BR2_TARGET_UBOOT_FORMAT_NAND),
  		cp -dpf $(@D)/$(UBOOT_MAKE_TARGET) $(BINARIES_DIR))
  	$(if $(BR2_TARGET_UBOOT_SPL),
  		$(foreach f,$(call qstrip,$(BR2_TARGET_UBOOT_SPL_NAME)), \
  			cp -dpf $(@D)/$(f) $(BINARIES_DIR)/
  		)
  	)
  	$(if $(BR2_TARGET_UBOOT_ENVIMAGE),
  		cat $(call qstrip,$(BR2_TARGET_UBOOT_ENVIMAGE_SOURCE)) | \
  			$(HOST_DIR)/usr/bin/mkenvimage -s $(BR2_TARGET_UBOOT_ENVIMAGE_SIZE) \
  			$(if $(BR2_TARGET_UBOOT_ENVIMAGE_REDUNDANT),-r) \
  			-o $(BINARIES_DIR)/uboot-env.bin -)
  endef
  
  define UBOOT_INSTALL_OMAP_IFT_IMAGE
  	cp -dpf $(@D)/$(UBOOT_BIN_IFT) $(BINARIES_DIR)/
  endef
  
  ifeq ($(BR2_TARGET_UBOOT_OMAP_IFT),y)
  ifeq ($(BR_BUILDING),y)
  ifeq ($(call qstrip,$(BR2_TARGET_UBOOT_OMAP_IFT_CONFIG)),)
  $(error No gpsign config file. Check your BR2_TARGET_UBOOT_OMAP_IFT_CONFIG setting)
  endif
  ifeq ($(wildcard $(call qstrip,$(BR2_TARGET_UBOOT_OMAP_IFT_CONFIG))),)
  $(error gpsign config file $(BR2_TARGET_UBOOT_OMAP_IFT_CONFIG) not found. Check your BR2_TARGET_UBOOT_OMAP_IFT_CONFIG setting)
  endif
  endif
  UBOOT_DEPENDENCIES += host-omap-u-boot-utils
  UBOOT_POST_BUILD_HOOKS += UBOOT_BUILD_OMAP_IFT
  UBOOT_POST_INSTALL_IMAGES_HOOKS += UBOOT_INSTALL_OMAP_IFT_IMAGE
  endif
  
  ifeq ($(BR2_TARGET_UBOOT_ZYNQ_IMAGE),y)
  define UBOOT_GENERATE_ZYNQ_IMAGE
  	$(HOST_DIR)/usr/bin/python2 \
  		$(HOST_DIR)/usr/bin/zynq-boot-bin.py \
  		-u $(@D)/$(firstword $(call qstrip,$(BR2_TARGET_UBOOT_SPL_NAME))) \
  		-o $(BINARIES_DIR)/BOOT.BIN
  endef
  UBOOT_DEPENDENCIES += host-zynq-boot-bin
  UBOOT_POST_INSTALL_IMAGES_HOOKS += UBOOT_GENERATE_ZYNQ_IMAGE
  endif
  
  ifeq ($(BR2_TARGET_UBOOT_ALTERA_SOCFPGA_IMAGE_CRC),y)
  define UBOOT_CRC_ALTERA_SOCFPGA_IMAGE
  	$(foreach f,$(call qstrip,$(BR2_TARGET_UBOOT_SPL_NAME)), \
  		$(HOST_DIR)/usr/bin/mkpimage \
  			-o $(BINARIES_DIR)/$(notdir $(call qstrip,$(f))).crc \
  			$(@D)/$(call qstrip,$(f))
  	)
  endef
  UBOOT_DEPENDENCIES += host-mkpimage
  UBOOT_POST_INSTALL_IMAGES_HOOKS += UBOOT_CRC_ALTERA_SOCFPGA_IMAGE
  endif
  
  ifeq ($(BR2_TARGET_UBOOT_ENVIMAGE),y)
  ifeq ($(BR_BUILDING),y)
  ifeq ($(call qstrip,$(BR2_TARGET_UBOOT_ENVIMAGE_SOURCE)),)
  $(error Please define a source file for Uboot environment (BR2_TARGET_UBOOT_ENVIMAGE_SOURCE setting))
  endif
  ifeq ($(call qstrip,$(BR2_TARGET_UBOOT_ENVIMAGE_SIZE)),)
  $(error Please provide Uboot environment size (BR2_TARGET_UBOOT_ENVIMAGE_SIZE setting))
  endif
  endif
  UBOOT_DEPENDENCIES += host-uboot-tools
  endif
  
  ifeq ($(BR2_TARGET_UBOOT)$(BR_BUILDING),yy)
  
  #
  # Check U-Boot board name (for legacy) or the defconfig/custom config
  # file options (for kconfig)
  #
  ifeq ($(BR2_TARGET_UBOOT_BUILD_SYSTEM_LEGACY),y)
  ifeq ($(UBOOT_BOARD_NAME),)
  $(error No U-Boot board name set. Check your BR2_TARGET_UBOOT_BOARDNAME setting)
  endif # UBOOT_BOARD_NAME
  else ifeq ($(BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG),y)
  ifeq ($(BR2_TARGET_UBOOT_USE_DEFCONFIG),y)
  ifeq ($(call qstrip,$(BR2_TARGET_UBOOT_BOARD_DEFCONFIG)),)
  $(error No board defconfig name specified, check your BR2_TARGET_UBOOT_DEFCONFIG setting)
  endif # qstrip BR2_TARGET_UBOOT_BOARD_DEFCONFIG
  endif # BR2_TARGET_UBOOT_USE_DEFCONFIG
  ifeq ($(BR2_TARGET_UBOOT_USE_CUSTOM_CONFIG),y)
  ifeq ($(call qstrip,$(BR2_TARGET_UBOOT_CUSTOM_CONFIG_FILE)),)
  $(error No board configuration file specified, check your BR2_TARGET_UBOOT_CUSTOM_CONFIG_FILE setting)
  endif # qstrip BR2_TARGET_UBOOT_CUSTOM_CONFIG_FILE
  endif # BR2_TARGET_UBOOT_USE_CUSTOM_CONFIG
  endif # BR2_TARGET_UBOOT_BUILD_SYSTEM_LEGACY
  
  #
  # Check custom version option
  #
  ifeq ($(BR2_TARGET_UBOOT_CUSTOM_VERSION),y)
  ifeq ($(call qstrip,$(BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE)),)
  $(error No custom U-Boot version specified. Check your BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE setting)
  endif # qstrip BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE
  endif # BR2_TARGET_UBOOT_CUSTOM_VERSION
  
  #
  # Check custom tarball option
  #
  ifeq ($(BR2_TARGET_UBOOT_CUSTOM_TARBALL),y)
  ifeq ($(call qstrip,$(BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION)),)
  $(error No custom U-Boot tarball specified. Check your BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION setting)
  endif # qstrip BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION
  endif # BR2_TARGET_UBOOT_CUSTOM_TARBALL
  
  #
  # Check Git/Mercurial repo options
  #
  ifeq ($(BR2_TARGET_UBOOT_CUSTOM_GIT)$(BR2_TARGET_UBOOT_CUSTOM_HG),y)
  ifeq ($(call qstrip,$(BR2_TARGET_UBOOT_CUSTOM_REPO_URL)),)
  $(error No custom U-Boot repository URL specified. Check your BR2_TARGET_UBOOT_CUSTOM_REPO_URL setting)
  endif # qstrip BR2_TARGET_UBOOT_CUSTOM_CUSTOM_REPO_URL
  ifeq ($(call qstrip,$(BR2_TARGET_UBOOT_CUSTOM_REPO_VERSION)),)
  $(error No custom U-Boot repository URL specified. Check your BR2_TARGET_UBOOT_CUSTOM_REPO_VERSION setting)
  endif # qstrip BR2_TARGET_UBOOT_CUSTOM_CUSTOM_REPO_VERSION
  endif # BR2_TARGET_UBOOT_CUSTOM_GIT || BR2_TARGET_UBOOT_CUSTOM_HG
  
  endif # BR2_TARGET_UBOOT && BR_BUILDING
  
  ifeq ($(BR2_TARGET_UBOOT_BUILD_SYSTEM_LEGACY),y)
  $(eval $(generic-package))
  else ifeq ($(BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG),y)
  $(eval $(kconfig-package))
  endif # BR2_TARGET_UBOOT_BUILD_SYSTEM_LEGACY