poky/meta/classes-recipe/uboot-sign.bbclass - mdmillerii/openbmc - Gitiles

 #
 # Copyright OpenEmbedded Contributors
 #
 # SPDX-License-Identifier: MIT
 #

 # This file is part of U-Boot verified boot support and is intended to be
 # inherited from the u-boot recipe.
 #
 # The signature procedure requires the user to generate an RSA key and
 # certificate in a directory and to define the following variable:
 #
 #   UBOOT_SIGN_KEYDIR = "/keys/directory"
 #   UBOOT_SIGN_KEYNAME = "dev" # keys name in keydir (eg. "dev.crt", "dev.key")
 #   UBOOT_MKIMAGE_DTCOPTS = "-I dts -O dtb -p 2000"
 #   UBOOT_SIGN_ENABLE = "1"
 #
 # As verified boot depends on fitImage generation, following is also required:
 #
 #   KERNEL_CLASSES ?= " kernel-fitimage "
 #   KERNEL_IMAGETYPE ?= "fitImage"
 #
 # The signature support is limited to the use of CONFIG_OF_SEPARATE in U-Boot.
 #
 # For more details on signature process, please refer to U-Boot documentation.

 # We need some variables from u-boot-config
 inherit uboot-config

 # Enable use of a U-Boot fitImage
 UBOOT_FITIMAGE_ENABLE ?= "0"

 # Signature activation - this requires UBOOT_FITIMAGE_ENABLE = "1"
 SPL_SIGN_ENABLE ?= "0"

 # Default value for deployment filenames.
 UBOOT_DTB_IMAGE ?= "u-boot-${MACHINE}-${PV}-${PR}.dtb"
 UBOOT_DTB_BINARY ?= "u-boot.dtb"
 UBOOT_DTB_SIGNED ?= "${UBOOT_DTB_BINARY}-signed"
 UBOOT_DTB_SYMLINK ?= "u-boot-${MACHINE}.dtb"
 UBOOT_NODTB_IMAGE ?= "u-boot-nodtb-${MACHINE}-${PV}-${PR}.bin"
 UBOOT_NODTB_BINARY ?= "u-boot-nodtb.bin"
 UBOOT_NODTB_SYMLINK ?= "u-boot-nodtb-${MACHINE}.bin"
 UBOOT_ITS_IMAGE ?= "u-boot-its-${MACHINE}-${PV}-${PR}"
 UBOOT_ITS ?= "u-boot.its"
 UBOOT_ITS_SYMLINK ?= "u-boot-its-${MACHINE}"
 UBOOT_FITIMAGE_IMAGE ?= "u-boot-fitImage-${MACHINE}-${PV}-${PR}"
 UBOOT_FITIMAGE_BINARY ?= "u-boot-fitImage"
 UBOOT_FITIMAGE_SYMLINK ?= "u-boot-fitImage-${MACHINE}"
 SPL_DIR ?= "spl"
 SPL_DTB_IMAGE ?= "u-boot-spl-${MACHINE}-${PV}-${PR}.dtb"
 SPL_DTB_BINARY ?= "u-boot-spl.dtb"
 SPL_DTB_SIGNED ?= "${SPL_DTB_BINARY}-signed"
 SPL_DTB_SYMLINK ?= "u-boot-spl-${MACHINE}.dtb"
 SPL_NODTB_IMAGE ?= "u-boot-spl-nodtb-${MACHINE}-${PV}-${PR}.bin"
 SPL_NODTB_BINARY ?= "u-boot-spl-nodtb.bin"
 SPL_NODTB_SYMLINK ?= "u-boot-spl-nodtb-${MACHINE}.bin"

 # U-Boot fitImage description
 UBOOT_FIT_DESC ?= "U-Boot fitImage for ${DISTRO_NAME}/${PV}/${MACHINE}"

 # U-Boot fitImage Hash Algo
 UBOOT_FIT_HASH_ALG ?= "sha256"

 # U-Boot fitImage Signature Algo
 UBOOT_FIT_SIGN_ALG ?= "rsa2048"

 # Generate keys for signing U-Boot fitImage
 UBOOT_FIT_GENERATE_KEYS ?= "0"

 # Size of private keys in number of bits
 UBOOT_FIT_SIGN_NUMBITS ?= "2048"

 # args to openssl genrsa (Default is just the public exponent)
 UBOOT_FIT_KEY_GENRSA_ARGS ?= "-F4"

 # args to openssl req (Default is -batch for non interactive mode and
 # -new for new certificate)
 UBOOT_FIT_KEY_REQ_ARGS ?= "-batch -new"

 # Standard format for public key certificate
 UBOOT_FIT_KEY_SIGN_PKCS ?= "-x509"

 # length of address in number of <u32> cells
 # ex: 1 32bits address, 2 64bits address
 UBOOT_FIT_ADDRESS_CELLS ?= "1"

 # This is only necessary for determining the signing configuration
 KERNEL_PN = "${PREFERRED_PROVIDER_virtual/kernel}"

 python() {
     # We need u-boot-tools-native if we're creating a U-Boot fitImage
     sign = d.getVar('UBOOT_SIGN_ENABLE') == '1'
     if d.getVar('UBOOT_FITIMAGE_ENABLE') == '1' or sign:
         d.appendVar('DEPENDS', " u-boot-tools-native dtc-native")
     if sign:
         d.appendVar('DEPENDS', " " + d.getVar('KERNEL_PN'))
 }

 concat_dtb() {
 	type="$1"
 	binary="$2"

 	if [ -e "${UBOOT_DTB_BINARY}" ]; then
 		# Re-sign the kernel in order to add the keys to our dtb
 		${UBOOT_MKIMAGE_SIGN} \
 			${@'-D "${UBOOT_MKIMAGE_DTCOPTS}"' if len('${UBOOT_MKIMAGE_DTCOPTS}') else ''} \
 			-F -k "${UBOOT_SIGN_KEYDIR}" \
 			-K "${UBOOT_DTB_BINARY}" \
 			-r ${B}/fitImage-linux \
 			${UBOOT_MKIMAGE_SIGN_ARGS}
 		cp ${UBOOT_DTB_BINARY} ${UBOOT_DTB_SIGNED}
 	fi

 	# If we're not using a signed u-boot fit, concatenate SPL w/o DTB & U-Boot DTB
 	# with public key (otherwise U-Boot will be packaged by uboot_fitimage_assemble)
 	if [ "${SPL_SIGN_ENABLE}" != "1" ] ; then
 		if [ "x${UBOOT_SUFFIX}" = "ximg" -o "x${UBOOT_SUFFIX}" = "xrom" ] && \
 			[ -e "${UBOOT_DTB_BINARY}" ]; then
 			oe_runmake EXT_DTB="${UBOOT_DTB_SIGNED}" ${UBOOT_MAKE_TARGET}
 			if [ -n "${binary}" ]; then
 				cp ${binary} ${UBOOT_BINARYNAME}-${type}.${UBOOT_SUFFIX}
 			fi
 		elif [ -e "${UBOOT_NODTB_BINARY}" -a -e "${UBOOT_DTB_BINARY}" ]; then
 			if [ -n "${binary}" ]; then
 				cat ${UBOOT_NODTB_BINARY} ${UBOOT_DTB_SIGNED} | tee ${binary} > \
 					${UBOOT_BINARYNAME}-${type}.${UBOOT_SUFFIX}
 			else
 				cat ${UBOOT_NODTB_BINARY} ${UBOOT_DTB_SIGNED} > ${UBOOT_BINARY}
 			fi
 		else
 			bbwarn "Failure while adding public key to u-boot binary. Verified boot won't be available."
 		fi
 	fi
 }

 deploy_dtb() {
 	type="$1"

 	if [ -n "${type}" ]; then
 		uboot_dtb_binary="u-boot-${type}-${PV}-${PR}.dtb"
 		uboot_nodtb_binary="u-boot-nodtb-${type}-${PV}-${PR}.bin"
 	else
 		uboot_dtb_binary="${UBOOT_DTB_IMAGE}"
 		uboot_nodtb_binary="${UBOOT_NODTB_IMAGE}"
 	fi

 	if [ -e "${UBOOT_DTB_SIGNED}" ]; then
 		install -Dm644 ${UBOOT_DTB_SIGNED} ${DEPLOYDIR}/${uboot_dtb_binary}
 		if [ -n "${type}" ]; then
 			ln -sf ${uboot_dtb_binary} ${DEPLOYDIR}/${UBOOT_DTB_IMAGE}
 		fi
 	fi

 	if [ -f "${UBOOT_NODTB_BINARY}" ]; then
 		install -Dm644 ${UBOOT_NODTB_BINARY} ${DEPLOYDIR}/${uboot_nodtb_binary}
 		if [ -n "${type}" ]; then
 			ln -sf ${uboot_nodtb_binary} ${DEPLOYDIR}/${UBOOT_NODTB_IMAGE}
 		fi
 	fi
 }

 concat_spl_dtb() {
 	if [ -e "${SPL_DIR}/${SPL_NODTB_BINARY}" -a -e "${SPL_DIR}/${SPL_DTB_BINARY}" ] ; then
 		cat ${SPL_DIR}/${SPL_NODTB_BINARY} ${SPL_DIR}/${SPL_DTB_SIGNED} > "${SPL_BINARY}"
 	else
 		bbwarn "Failure while adding public key to spl binary. Verified U-Boot boot won't be available."
 	fi
 }

 deploy_spl_dtb() {
 	type="$1"

 	if [ -n "${type}" ]; then
 		spl_dtb_binary="u-boot-spl-${type}-${PV}-${PR}.dtb"
 		spl_nodtb_binary="u-boot-spl-nodtb-${type}-${PV}-${PR}.bin"
 	else
 		spl_dtb_binary="${SPL_DTB_IMAGE}"
 		spl_nodtb_binary="${SPL_NODTB_IMAGE}"
 	fi

 	if [ -e "${SPL_DIR}/${SPL_DTB_SIGNED}" ] ; then
 		install -Dm644 ${SPL_DIR}/${SPL_DTB_SIGNED} ${DEPLOYDIR}/${spl_dtb_binary}
 		if [ -n "${type}" ]; then
 			ln -sf ${spl_dtb_binary} ${DEPLOYDIR}/${SPL_DTB_IMAGE}
 		fi
 	fi

 	if [ -f "${SPL_DIR}/${SPL_NODTB_BINARY}" ] ; then
 		install -Dm644 ${SPL_DIR}/${SPL_NODTB_BINARY} ${DEPLOYDIR}/${spl_nodtb_binary}
 		if [ -n "${type}" ]; then
 			ln -sf ${spl_nodtb_binary} ${DEPLOYDIR}/${SPL_NODTB_IMAGE}
 		fi
 	fi

 	# For backwards compatibility...
 	install -Dm644 ${SPL_BINARY} ${DEPLOYDIR}/${SPL_IMAGE}
 }

 do_uboot_generate_rsa_keys() {
 	if [ "${SPL_SIGN_ENABLE}" = "0" ] && [ "${UBOOT_FIT_GENERATE_KEYS}" = "1" ]; then
 		bbwarn "UBOOT_FIT_GENERATE_KEYS is set to 1 eventhough SPL_SIGN_ENABLE is set to 0. The keys will not be generated as they won't be used."
 	fi

 	if [ "${SPL_SIGN_ENABLE}" = "1" ] && [ "${UBOOT_FIT_GENERATE_KEYS}" = "1" ]; then

 		# Generate keys only if they don't already exist
 		if [ ! -f "${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".key ] || \
 			[ ! -f "${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".crt ]; then

 			# make directory if it does not already exist
 			mkdir -p "${SPL_SIGN_KEYDIR}"

 			echo "Generating RSA private key for signing U-Boot fitImage"
 			openssl genrsa ${UBOOT_FIT_KEY_GENRSA_ARGS} -out \
 				"${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".key \
 				"${UBOOT_FIT_SIGN_NUMBITS}"

 			echo "Generating certificate for signing U-Boot fitImage"
 			openssl req ${UBOOT_FIT_KEY_REQ_ARGS} "${UBOOT_FIT_KEY_SIGN_PKCS}" \
 				-key "${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".key \
 				-out "${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".crt
 		fi
 	fi

 }

 addtask uboot_generate_rsa_keys before do_uboot_assemble_fitimage after do_compile

 # Create a ITS file for the U-boot FIT, for use when
 # we want to sign it so that the SPL can verify it
 uboot_fitimage_assemble() {
 	rm -f ${UBOOT_ITS} ${UBOOT_FITIMAGE_BINARY}

 	# First we create the ITS script
 	cat << EOF >> ${UBOOT_ITS}
 /dts-v1/;

 / {
     description = "${UBOOT_FIT_DESC}";
     #address-cells = <${UBOOT_FIT_ADDRESS_CELLS}>;

     images {
         uboot {
             description = "U-Boot image";
             data = /incbin/("${UBOOT_NODTB_BINARY}");
             type = "standalone";
             os = "u-boot";
             arch = "${UBOOT_ARCH}";
             compression = "none";
             load = <${UBOOT_LOADADDRESS}>;
             entry = <${UBOOT_ENTRYPOINT}>;
 EOF

 	if [ "${SPL_SIGN_ENABLE}" = "1" ] ; then
 		cat << EOF >> ${UBOOT_ITS}
             signature {
                 algo = "${UBOOT_FIT_HASH_ALG},${UBOOT_FIT_SIGN_ALG}";
                 key-name-hint = "${SPL_SIGN_KEYNAME}";
             };
 EOF
 	fi

 	cat << EOF >> ${UBOOT_ITS}
         };
         fdt {
             description = "U-Boot FDT";
             data = /incbin/("${UBOOT_DTB_BINARY}");
             type = "flat_dt";
             arch = "${UBOOT_ARCH}";
             compression = "none";
 EOF

 	if [ "${SPL_SIGN_ENABLE}" = "1" ] ; then
 		cat << EOF >> ${UBOOT_ITS}
             signature {
                 algo = "${UBOOT_FIT_HASH_ALG},${UBOOT_FIT_SIGN_ALG}";
                 key-name-hint = "${SPL_SIGN_KEYNAME}";
             };
 EOF
 	fi

 	cat << EOF >> ${UBOOT_ITS}
         };
     };

     configurations {
         default = "conf";
         conf {
             description = "Boot with signed U-Boot FIT";
             loadables = "uboot";
             fdt = "fdt";
         };
     };
 };
 EOF

 	#
 	# Assemble the U-boot FIT image
 	#
 	${UBOOT_MKIMAGE} \
 		${@'-D "${SPL_MKIMAGE_DTCOPTS}"' if len('${SPL_MKIMAGE_DTCOPTS}') else ''} \
 		-f ${UBOOT_ITS} \
 		${UBOOT_FITIMAGE_BINARY}

 	if [ "${SPL_SIGN_ENABLE}" = "1" ] ; then
 		#
 		# Sign the U-boot FIT image and add public key to SPL dtb
 		#
 		${UBOOT_MKIMAGE_SIGN} \
 			${@'-D "${SPL_MKIMAGE_DTCOPTS}"' if len('${SPL_MKIMAGE_DTCOPTS}') else ''} \
 			-F -k "${SPL_SIGN_KEYDIR}" \
 			-K "${SPL_DIR}/${SPL_DTB_BINARY}" \
 			-r ${UBOOT_FITIMAGE_BINARY} \
 			${SPL_MKIMAGE_SIGN_ARGS}
 	fi

 	cp ${SPL_DIR}/${SPL_DTB_BINARY} ${SPL_DIR}/${SPL_DTB_SIGNED}
 }

 uboot_assemble_fitimage_helper() {
 	type="$1"
 	binary="$2"

 	if [ "${UBOOT_SIGN_ENABLE}" = "1" -a -n "${UBOOT_DTB_BINARY}" ] ; then
 		concat_dtb $type $binary
 	fi

 	if [ "${UBOOT_FITIMAGE_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ]; then
 		uboot_fitimage_assemble
 	fi

 	if [ "${SPL_SIGN_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ] ; then
 		concat_spl_dtb
 	fi
 }

 do_uboot_assemble_fitimage() {
 	if [ "${UBOOT_SIGN_ENABLE}" = "1" ] ; then
 		cp "${STAGING_DIR_HOST}/sysroot-only/fitImage" "${B}/fitImage-linux"
 	fi

 	if [ -n "${UBOOT_CONFIG}" ]; then
 		unset i j k
 		for config in ${UBOOT_MACHINE}; do
 			i=$(expr $i + 1);
 			for type in ${UBOOT_CONFIG}; do
 				j=$(expr $j + 1);
 				if [ $j -eq $i ]; then
 					break;
 				fi
 			done

 			for binary in ${UBOOT_BINARIES}; do
 				k=$(expr $j + 1);
 				if [ $k -eq $i ]; then
 					break;
 				fi
 			done

 			cd ${B}/${config}
 			uboot_assemble_fitimage_helper ${type} ${binary}
 		done
 	else
 		cd ${B}
 		uboot_assemble_fitimage_helper "" ${UBOOT_BINARY}
 	fi
 }

 addtask uboot_assemble_fitimage before do_install do_deploy after do_compile

 deploy_helper() {
 	type="$1"

 	if [ "${UBOOT_SIGN_ENABLE}" = "1" -a -n "${UBOOT_DTB_SIGNED}" ] ; then
 		deploy_dtb $type
 	fi

 	if [ "${UBOOT_FITIMAGE_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ]; then
 		if [ -n "${type}" ]; then
 			uboot_its_image="u-boot-its-${type}-${PV}-${PR}"
 			uboot_fitimage_image="u-boot-fitImage-${type}-${PV}-${PR}"
 		else
 			uboot_its_image="${UBOOT_ITS_IMAGE}"
 			uboot_fitimage_image="${UBOOT_FITIMAGE_IMAGE}"
 		fi

 		install -Dm644 ${UBOOT_FITIMAGE_BINARY} ${DEPLOYDIR}/$uboot_fitimage_image
 		install -Dm644 ${UBOOT_ITS} ${DEPLOYDIR}/$uboot_its_image

 		if [ -n "${type}" ]; then
 			ln -sf $uboot_its_image ${DEPLOYDIR}/${UBOOT_ITS_IMAGE}
 			ln -sf $uboot_fitimage_image ${DEPLOYDIR}/${UBOOT_FITIMAGE_IMAGE}
 		fi
 	fi

 	if [ "${SPL_SIGN_ENABLE}" = "1" -a -n "${SPL_DTB_SIGNED}" ] ; then
 		deploy_spl_dtb $type
 	fi
 }

 do_deploy:prepend() {
 	if [ -n "${UBOOT_CONFIG}" ]; then
 		unset i j k
 		for config in ${UBOOT_MACHINE}; do
 			i=$(expr $i + 1);
 			for type in ${UBOOT_CONFIG}; do
 				j=$(expr $j + 1);
 				if [ $j -eq $i ]; then
 					cd ${B}/${config}
 					deploy_helper ${type}
 				fi
 			done
 			unset j
 		done
 		unset i
 	else
 		cd ${B}
 		deploy_helper ""
 	fi

 	if [ "${UBOOT_SIGN_ENABLE}" = "1" -a -n "${UBOOT_DTB_BINARY}" ] ; then
 		ln -sf ${UBOOT_DTB_IMAGE} ${DEPLOYDIR}/${UBOOT_DTB_BINARY}
 		ln -sf ${UBOOT_DTB_IMAGE} ${DEPLOYDIR}/${UBOOT_DTB_SYMLINK}
 		ln -sf ${UBOOT_NODTB_IMAGE} ${DEPLOYDIR}/${UBOOT_NODTB_SYMLINK}
 		ln -sf ${UBOOT_NODTB_IMAGE} ${DEPLOYDIR}/${UBOOT_NODTB_BINARY}
 	fi

 	if [ "${UBOOT_FITIMAGE_ENABLE}" = "1" ] ; then
 		ln -sf ${UBOOT_ITS_IMAGE} ${DEPLOYDIR}/${UBOOT_ITS}
 		ln -sf ${UBOOT_ITS_IMAGE} ${DEPLOYDIR}/${UBOOT_ITS_SYMLINK}
 		ln -sf ${UBOOT_FITIMAGE_IMAGE} ${DEPLOYDIR}/${UBOOT_FITIMAGE_BINARY}
 		ln -sf ${UBOOT_FITIMAGE_IMAGE} ${DEPLOYDIR}/${UBOOT_FITIMAGE_SYMLINK}
 	fi

 	if [ "${SPL_SIGN_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ] ; then
 		ln -sf ${SPL_DTB_IMAGE} ${DEPLOYDIR}/${SPL_DTB_SYMLINK}
 		ln -sf ${SPL_DTB_IMAGE} ${DEPLOYDIR}/${SPL_DTB_BINARY}
 		ln -sf ${SPL_NODTB_IMAGE} ${DEPLOYDIR}/${SPL_NODTB_SYMLINK}
 		ln -sf ${SPL_NODTB_IMAGE} ${DEPLOYDIR}/${SPL_NODTB_BINARY}
 	fi
 }

 do_deploy:append() {
 	# If we're creating a u-boot fitImage, point u-boot.bin
 	# symlink since it might get used by image recipes
 	if [ "${UBOOT_FITIMAGE_ENABLE}" = "1" ] ; then
 		ln -sf ${UBOOT_FITIMAGE_IMAGE} ${DEPLOYDIR}/${UBOOT_BINARY}
 		ln -sf ${UBOOT_FITIMAGE_IMAGE} ${DEPLOYDIR}/${UBOOT_SYMLINK}
 	fi
 }
	#
	# Copyright OpenEmbedded Contributors
	#
	# SPDX-License-Identifier: MIT
	#

	# This file is part of U-Boot verified boot support and is intended to be
	# inherited from the u-boot recipe.
	#
	# The signature procedure requires the user to generate an RSA key and
	# certificate in a directory and to define the following variable:
	#
	# UBOOT_SIGN_KEYDIR = "/keys/directory"
	# UBOOT_SIGN_KEYNAME = "dev" # keys name in keydir (eg. "dev.crt", "dev.key")
	# UBOOT_MKIMAGE_DTCOPTS = "-I dts -O dtb -p 2000"
	# UBOOT_SIGN_ENABLE = "1"
	#
	# As verified boot depends on fitImage generation, following is also required:
	#
	# KERNEL_CLASSES ?= " kernel-fitimage "
	# KERNEL_IMAGETYPE ?= "fitImage"
	#
	# The signature support is limited to the use of CONFIG_OF_SEPARATE in U-Boot.
	#
	# For more details on signature process, please refer to U-Boot documentation.

	# We need some variables from u-boot-config
	inherit uboot-config

	# Enable use of a U-Boot fitImage
	UBOOT_FITIMAGE_ENABLE ?= "0"

	# Signature activation - this requires UBOOT_FITIMAGE_ENABLE = "1"
	SPL_SIGN_ENABLE ?= "0"

	# Default value for deployment filenames.
	UBOOT_DTB_IMAGE ?= "u-boot-${MACHINE}-${PV}-${PR}.dtb"
	UBOOT_DTB_BINARY ?= "u-boot.dtb"
	UBOOT_DTB_SIGNED ?= "${UBOOT_DTB_BINARY}-signed"
	UBOOT_DTB_SYMLINK ?= "u-boot-${MACHINE}.dtb"
	UBOOT_NODTB_IMAGE ?= "u-boot-nodtb-${MACHINE}-${PV}-${PR}.bin"
	UBOOT_NODTB_BINARY ?= "u-boot-nodtb.bin"
	UBOOT_NODTB_SYMLINK ?= "u-boot-nodtb-${MACHINE}.bin"
	UBOOT_ITS_IMAGE ?= "u-boot-its-${MACHINE}-${PV}-${PR}"
	UBOOT_ITS ?= "u-boot.its"
	UBOOT_ITS_SYMLINK ?= "u-boot-its-${MACHINE}"
	UBOOT_FITIMAGE_IMAGE ?= "u-boot-fitImage-${MACHINE}-${PV}-${PR}"
	UBOOT_FITIMAGE_BINARY ?= "u-boot-fitImage"
	UBOOT_FITIMAGE_SYMLINK ?= "u-boot-fitImage-${MACHINE}"
	SPL_DIR ?= "spl"
	SPL_DTB_IMAGE ?= "u-boot-spl-${MACHINE}-${PV}-${PR}.dtb"
	SPL_DTB_BINARY ?= "u-boot-spl.dtb"
	SPL_DTB_SIGNED ?= "${SPL_DTB_BINARY}-signed"
	SPL_DTB_SYMLINK ?= "u-boot-spl-${MACHINE}.dtb"
	SPL_NODTB_IMAGE ?= "u-boot-spl-nodtb-${MACHINE}-${PV}-${PR}.bin"
	SPL_NODTB_BINARY ?= "u-boot-spl-nodtb.bin"
	SPL_NODTB_SYMLINK ?= "u-boot-spl-nodtb-${MACHINE}.bin"

	# U-Boot fitImage description
	UBOOT_FIT_DESC ?= "U-Boot fitImage for ${DISTRO_NAME}/${PV}/${MACHINE}"

	# U-Boot fitImage Hash Algo
	UBOOT_FIT_HASH_ALG ?= "sha256"

	# U-Boot fitImage Signature Algo
	UBOOT_FIT_SIGN_ALG ?= "rsa2048"

	# Generate keys for signing U-Boot fitImage
	UBOOT_FIT_GENERATE_KEYS ?= "0"

	# Size of private keys in number of bits
	UBOOT_FIT_SIGN_NUMBITS ?= "2048"

	# args to openssl genrsa (Default is just the public exponent)
	UBOOT_FIT_KEY_GENRSA_ARGS ?= "-F4"

	# args to openssl req (Default is -batch for non interactive mode and
	# -new for new certificate)
	UBOOT_FIT_KEY_REQ_ARGS ?= "-batch -new"

	# Standard format for public key certificate
	UBOOT_FIT_KEY_SIGN_PKCS ?= "-x509"

	# length of address in number of <u32> cells
	# ex: 1 32bits address, 2 64bits address
	UBOOT_FIT_ADDRESS_CELLS ?= "1"

	# This is only necessary for determining the signing configuration
	KERNEL_PN = "${PREFERRED_PROVIDER_virtual/kernel}"

	python() {
	# We need u-boot-tools-native if we're creating a U-Boot fitImage
	sign = d.getVar('UBOOT_SIGN_ENABLE') == '1'
	if d.getVar('UBOOT_FITIMAGE_ENABLE') == '1' or sign:
	d.appendVar('DEPENDS', " u-boot-tools-native dtc-native")
	if sign:
	d.appendVar('DEPENDS', " " + d.getVar('KERNEL_PN'))
	}

	concat_dtb() {
	type="$1"
	binary="$2"

	if [ -e "${UBOOT_DTB_BINARY}" ]; then
	# Re-sign the kernel in order to add the keys to our dtb
	${UBOOT_MKIMAGE_SIGN} \
	${@'-D "${UBOOT_MKIMAGE_DTCOPTS}"' if len('${UBOOT_MKIMAGE_DTCOPTS}') else ''} \
	-F -k "${UBOOT_SIGN_KEYDIR}" \
	-K "${UBOOT_DTB_BINARY}" \
	-r ${B}/fitImage-linux \
	${UBOOT_MKIMAGE_SIGN_ARGS}
	cp ${UBOOT_DTB_BINARY} ${UBOOT_DTB_SIGNED}
	fi

	# If we're not using a signed u-boot fit, concatenate SPL w/o DTB & U-Boot DTB
	# with public key (otherwise U-Boot will be packaged by uboot_fitimage_assemble)
	if [ "${SPL_SIGN_ENABLE}" != "1" ] ; then
	if [ "x${UBOOT_SUFFIX}" = "ximg" -o "x${UBOOT_SUFFIX}" = "xrom" ] && \
	[ -e "${UBOOT_DTB_BINARY}" ]; then
	oe_runmake EXT_DTB="${UBOOT_DTB_SIGNED}" ${UBOOT_MAKE_TARGET}
	if [ -n "${binary}" ]; then
	cp ${binary} ${UBOOT_BINARYNAME}-${type}.${UBOOT_SUFFIX}
	fi
	elif [ -e "${UBOOT_NODTB_BINARY}" -a -e "${UBOOT_DTB_BINARY}" ]; then
	if [ -n "${binary}" ]; then
	cat ${UBOOT_NODTB_BINARY} ${UBOOT_DTB_SIGNED} \| tee ${binary} > \
	${UBOOT_BINARYNAME}-${type}.${UBOOT_SUFFIX}
	else
	cat ${UBOOT_NODTB_BINARY} ${UBOOT_DTB_SIGNED} > ${UBOOT_BINARY}
	fi
	else
	bbwarn "Failure while adding public key to u-boot binary. Verified boot won't be available."
	fi
	fi
	}

	deploy_dtb() {
	type="$1"

	if [ -n "${type}" ]; then
	uboot_dtb_binary="u-boot-${type}-${PV}-${PR}.dtb"
	uboot_nodtb_binary="u-boot-nodtb-${type}-${PV}-${PR}.bin"
	else
	uboot_dtb_binary="${UBOOT_DTB_IMAGE}"
	uboot_nodtb_binary="${UBOOT_NODTB_IMAGE}"
	fi

	if [ -e "${UBOOT_DTB_SIGNED}" ]; then
	install -Dm644 ${UBOOT_DTB_SIGNED} ${DEPLOYDIR}/${uboot_dtb_binary}
	if [ -n "${type}" ]; then
	ln -sf ${uboot_dtb_binary} ${DEPLOYDIR}/${UBOOT_DTB_IMAGE}
	fi
	fi

	if [ -f "${UBOOT_NODTB_BINARY}" ]; then
	install -Dm644 ${UBOOT_NODTB_BINARY} ${DEPLOYDIR}/${uboot_nodtb_binary}
	if [ -n "${type}" ]; then
	ln -sf ${uboot_nodtb_binary} ${DEPLOYDIR}/${UBOOT_NODTB_IMAGE}
	fi
	fi
	}

	concat_spl_dtb() {
	if [ -e "${SPL_DIR}/${SPL_NODTB_BINARY}" -a -e "${SPL_DIR}/${SPL_DTB_BINARY}" ] ; then
	cat ${SPL_DIR}/${SPL_NODTB_BINARY} ${SPL_DIR}/${SPL_DTB_SIGNED} > "${SPL_BINARY}"
	else
	bbwarn "Failure while adding public key to spl binary. Verified U-Boot boot won't be available."
	fi
	}

	deploy_spl_dtb() {
	type="$1"

	if [ -n "${type}" ]; then
	spl_dtb_binary="u-boot-spl-${type}-${PV}-${PR}.dtb"
	spl_nodtb_binary="u-boot-spl-nodtb-${type}-${PV}-${PR}.bin"
	else
	spl_dtb_binary="${SPL_DTB_IMAGE}"
	spl_nodtb_binary="${SPL_NODTB_IMAGE}"
	fi

	if [ -e "${SPL_DIR}/${SPL_DTB_SIGNED}" ] ; then
	install -Dm644 ${SPL_DIR}/${SPL_DTB_SIGNED} ${DEPLOYDIR}/${spl_dtb_binary}
	if [ -n "${type}" ]; then
	ln -sf ${spl_dtb_binary} ${DEPLOYDIR}/${SPL_DTB_IMAGE}
	fi
	fi

	if [ -f "${SPL_DIR}/${SPL_NODTB_BINARY}" ] ; then
	install -Dm644 ${SPL_DIR}/${SPL_NODTB_BINARY} ${DEPLOYDIR}/${spl_nodtb_binary}
	if [ -n "${type}" ]; then
	ln -sf ${spl_nodtb_binary} ${DEPLOYDIR}/${SPL_NODTB_IMAGE}
	fi
	fi

	# For backwards compatibility...
	install -Dm644 ${SPL_BINARY} ${DEPLOYDIR}/${SPL_IMAGE}
	}

	do_uboot_generate_rsa_keys() {
	if [ "${SPL_SIGN_ENABLE}" = "0" ] && [ "${UBOOT_FIT_GENERATE_KEYS}" = "1" ]; then
	bbwarn "UBOOT_FIT_GENERATE_KEYS is set to 1 eventhough SPL_SIGN_ENABLE is set to 0. The keys will not be generated as they won't be used."
	fi

	if [ "${SPL_SIGN_ENABLE}" = "1" ] && [ "${UBOOT_FIT_GENERATE_KEYS}" = "1" ]; then

	# Generate keys only if they don't already exist
	if [ ! -f "${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".key ] \|\| \
	[ ! -f "${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".crt ]; then

	# make directory if it does not already exist
	mkdir -p "${SPL_SIGN_KEYDIR}"

	echo "Generating RSA private key for signing U-Boot fitImage"
	openssl genrsa ${UBOOT_FIT_KEY_GENRSA_ARGS} -out \
	"${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".key \
	"${UBOOT_FIT_SIGN_NUMBITS}"

	echo "Generating certificate for signing U-Boot fitImage"
	openssl req ${UBOOT_FIT_KEY_REQ_ARGS} "${UBOOT_FIT_KEY_SIGN_PKCS}" \
	-key "${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".key \
	-out "${SPL_SIGN_KEYDIR}/${SPL_SIGN_KEYNAME}".crt
	fi
	fi

	}

	addtask uboot_generate_rsa_keys before do_uboot_assemble_fitimage after do_compile

	# Create a ITS file for the U-boot FIT, for use when
	# we want to sign it so that the SPL can verify it
	uboot_fitimage_assemble() {
	rm -f ${UBOOT_ITS} ${UBOOT_FITIMAGE_BINARY}

	# First we create the ITS script
	cat << EOF >> ${UBOOT_ITS}
	/dts-v1/;

	/ {
	description = "${UBOOT_FIT_DESC}";
	#address-cells = <${UBOOT_FIT_ADDRESS_CELLS}>;

	images {
	uboot {
	description = "U-Boot image";
	data = /incbin/("${UBOOT_NODTB_BINARY}");
	type = "standalone";
	os = "u-boot";
	arch = "${UBOOT_ARCH}";
	compression = "none";
	load = <${UBOOT_LOADADDRESS}>;
	entry = <${UBOOT_ENTRYPOINT}>;
	EOF

	if [ "${SPL_SIGN_ENABLE}" = "1" ] ; then
	cat << EOF >> ${UBOOT_ITS}
	signature {
	algo = "${UBOOT_FIT_HASH_ALG},${UBOOT_FIT_SIGN_ALG}";
	key-name-hint = "${SPL_SIGN_KEYNAME}";
	};
	EOF
	fi

	cat << EOF >> ${UBOOT_ITS}
	};
	fdt {
	description = "U-Boot FDT";
	data = /incbin/("${UBOOT_DTB_BINARY}");
	type = "flat_dt";
	arch = "${UBOOT_ARCH}";
	compression = "none";
	EOF

	if [ "${SPL_SIGN_ENABLE}" = "1" ] ; then
	cat << EOF >> ${UBOOT_ITS}
	signature {
	algo = "${UBOOT_FIT_HASH_ALG},${UBOOT_FIT_SIGN_ALG}";
	key-name-hint = "${SPL_SIGN_KEYNAME}";
	};
	EOF
	fi

	cat << EOF >> ${UBOOT_ITS}
	};
	};

	configurations {
	default = "conf";
	conf {
	description = "Boot with signed U-Boot FIT";
	loadables = "uboot";
	fdt = "fdt";
	};
	};
	};
	EOF

	#
	# Assemble the U-boot FIT image
	#
	${UBOOT_MKIMAGE} \
	${@'-D "${SPL_MKIMAGE_DTCOPTS}"' if len('${SPL_MKIMAGE_DTCOPTS}') else ''} \
	-f ${UBOOT_ITS} \
	${UBOOT_FITIMAGE_BINARY}

	if [ "${SPL_SIGN_ENABLE}" = "1" ] ; then
	#
	# Sign the U-boot FIT image and add public key to SPL dtb
	#
	${UBOOT_MKIMAGE_SIGN} \
	${@'-D "${SPL_MKIMAGE_DTCOPTS}"' if len('${SPL_MKIMAGE_DTCOPTS}') else ''} \
	-F -k "${SPL_SIGN_KEYDIR}" \
	-K "${SPL_DIR}/${SPL_DTB_BINARY}" \
	-r ${UBOOT_FITIMAGE_BINARY} \
	${SPL_MKIMAGE_SIGN_ARGS}
	fi

	cp ${SPL_DIR}/${SPL_DTB_BINARY} ${SPL_DIR}/${SPL_DTB_SIGNED}
	}

	uboot_assemble_fitimage_helper() {
	type="$1"
	binary="$2"

	if [ "${UBOOT_SIGN_ENABLE}" = "1" -a -n "${UBOOT_DTB_BINARY}" ] ; then
	concat_dtb $type $binary
	fi

	if [ "${UBOOT_FITIMAGE_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ]; then
	uboot_fitimage_assemble
	fi

	if [ "${SPL_SIGN_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ] ; then
	concat_spl_dtb
	fi
	}

	do_uboot_assemble_fitimage() {
	if [ "${UBOOT_SIGN_ENABLE}" = "1" ] ; then
	cp "${STAGING_DIR_HOST}/sysroot-only/fitImage" "${B}/fitImage-linux"
	fi

	if [ -n "${UBOOT_CONFIG}" ]; then
	unset i j k
	for config in ${UBOOT_MACHINE}; do
	i=$(expr $i + 1);
	for type in ${UBOOT_CONFIG}; do
	j=$(expr $j + 1);
	if [ $j -eq $i ]; then
	break;
	fi
	done

	for binary in ${UBOOT_BINARIES}; do
	k=$(expr $j + 1);
	if [ $k -eq $i ]; then
	break;
	fi
	done

	cd ${B}/${config}
	uboot_assemble_fitimage_helper ${type} ${binary}
	done
	else
	cd ${B}
	uboot_assemble_fitimage_helper "" ${UBOOT_BINARY}
	fi
	}

	addtask uboot_assemble_fitimage before do_install do_deploy after do_compile

	deploy_helper() {
	type="$1"

	if [ "${UBOOT_SIGN_ENABLE}" = "1" -a -n "${UBOOT_DTB_SIGNED}" ] ; then
	deploy_dtb $type
	fi

	if [ "${UBOOT_FITIMAGE_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ]; then
	if [ -n "${type}" ]; then
	uboot_its_image="u-boot-its-${type}-${PV}-${PR}"
	uboot_fitimage_image="u-boot-fitImage-${type}-${PV}-${PR}"
	else
	uboot_its_image="${UBOOT_ITS_IMAGE}"
	uboot_fitimage_image="${UBOOT_FITIMAGE_IMAGE}"
	fi

	install -Dm644 ${UBOOT_FITIMAGE_BINARY} ${DEPLOYDIR}/$uboot_fitimage_image
	install -Dm644 ${UBOOT_ITS} ${DEPLOYDIR}/$uboot_its_image

	if [ -n "${type}" ]; then
	ln -sf $uboot_its_image ${DEPLOYDIR}/${UBOOT_ITS_IMAGE}
	ln -sf $uboot_fitimage_image ${DEPLOYDIR}/${UBOOT_FITIMAGE_IMAGE}
	fi
	fi

	if [ "${SPL_SIGN_ENABLE}" = "1" -a -n "${SPL_DTB_SIGNED}" ] ; then
	deploy_spl_dtb $type
	fi
	}

	do_deploy:prepend() {
	if [ -n "${UBOOT_CONFIG}" ]; then
	unset i j k
	for config in ${UBOOT_MACHINE}; do
	i=$(expr $i + 1);
	for type in ${UBOOT_CONFIG}; do
	j=$(expr $j + 1);
	if [ $j -eq $i ]; then
	cd ${B}/${config}
	deploy_helper ${type}
	fi
	done
	unset j
	done
	unset i
	else
	cd ${B}
	deploy_helper ""
	fi

	if [ "${UBOOT_SIGN_ENABLE}" = "1" -a -n "${UBOOT_DTB_BINARY}" ] ; then
	ln -sf ${UBOOT_DTB_IMAGE} ${DEPLOYDIR}/${UBOOT_DTB_BINARY}
	ln -sf ${UBOOT_DTB_IMAGE} ${DEPLOYDIR}/${UBOOT_DTB_SYMLINK}
	ln -sf ${UBOOT_NODTB_IMAGE} ${DEPLOYDIR}/${UBOOT_NODTB_SYMLINK}
	ln -sf ${UBOOT_NODTB_IMAGE} ${DEPLOYDIR}/${UBOOT_NODTB_BINARY}
	fi

	if [ "${UBOOT_FITIMAGE_ENABLE}" = "1" ] ; then
	ln -sf ${UBOOT_ITS_IMAGE} ${DEPLOYDIR}/${UBOOT_ITS}
	ln -sf ${UBOOT_ITS_IMAGE} ${DEPLOYDIR}/${UBOOT_ITS_SYMLINK}
	ln -sf ${UBOOT_FITIMAGE_IMAGE} ${DEPLOYDIR}/${UBOOT_FITIMAGE_BINARY}
	ln -sf ${UBOOT_FITIMAGE_IMAGE} ${DEPLOYDIR}/${UBOOT_FITIMAGE_SYMLINK}
	fi

	if [ "${SPL_SIGN_ENABLE}" = "1" -a -n "${SPL_DTB_BINARY}" ] ; then
	ln -sf ${SPL_DTB_IMAGE} ${DEPLOYDIR}/${SPL_DTB_SYMLINK}
	ln -sf ${SPL_DTB_IMAGE} ${DEPLOYDIR}/${SPL_DTB_BINARY}
	ln -sf ${SPL_NODTB_IMAGE} ${DEPLOYDIR}/${SPL_NODTB_SYMLINK}
	ln -sf ${SPL_NODTB_IMAGE} ${DEPLOYDIR}/${SPL_NODTB_BINARY}
	fi
	}

	do_deploy:append() {
	# If we're creating a u-boot fitImage, point u-boot.bin
	# symlink since it might get used by image recipes
	if [ "${UBOOT_FITIMAGE_ENABLE}" = "1" ] ; then
	ln -sf ${UBOOT_FITIMAGE_IMAGE} ${DEPLOYDIR}/${UBOOT_BINARY}
	ln -sf ${UBOOT_FITIMAGE_IMAGE} ${DEPLOYDIR}/${UBOOT_SYMLINK}
	fi
	}