poky/meta/classes/kernel-fitimage.bbclass

inherit kernel-uboot kernel-artifact-names uboot-sign

KERNEL_IMAGETYPE_REPLACEMENT = ""

python __anonymous () {
    kerneltypes = d.getVar('KERNEL_IMAGETYPES') or ""
    if 'fitImage' in kerneltypes.split():
        depends = d.getVar("DEPENDS")
        depends = "%s u-boot-tools-native dtc-native" % depends
        d.setVar("DEPENDS", depends)

        uarch = d.getVar("UBOOT_ARCH")
        if uarch == "arm64":
            replacementtype = "Image"
        elif uarch == "riscv":
            replacementtype = "Image"
        elif uarch == "mips":
            replacementtype = "vmlinuz.bin"
        elif uarch == "x86":
            replacementtype = "bzImage"
        elif uarch == "microblaze":
            replacementtype = "linux.bin"
        else:
            replacementtype = "zImage"

        d.setVar("KERNEL_IMAGETYPE_REPLACEMENT", replacementtype)

        # Override KERNEL_IMAGETYPE_FOR_MAKE variable, which is internal
        # to kernel.bbclass . We have to override it, since we pack zImage
        # (at least for now) into the fitImage .
        typeformake = d.getVar("KERNEL_IMAGETYPE_FOR_MAKE") or ""
        if 'fitImage' in typeformake.split():
            d.setVar('KERNEL_IMAGETYPE_FOR_MAKE', typeformake.replace('fitImage', replacementtype))

        image = d.getVar('INITRAMFS_IMAGE')
        if image:
            d.appendVarFlag('do_assemble_fitimage_initramfs', 'depends', ' ${INITRAMFS_IMAGE}:do_image_complete')

        #check if there are any dtb providers
        providerdtb = d.getVar("PREFERRED_PROVIDER_virtual/dtb")
        if providerdtb:
            d.appendVarFlag('do_assemble_fitimage', 'depends', ' virtual/dtb:do_populate_sysroot')
            d.appendVarFlag('do_assemble_fitimage_initramfs', 'depends', ' virtual/dtb:do_populate_sysroot')
            d.setVar('EXTERNAL_KERNEL_DEVICETREE', "${RECIPE_SYSROOT}/boot/devicetree")

        # Verified boot will sign the fitImage and append the public key to
        # U-Boot dtb. We ensure the U-Boot dtb is deployed before assembling
        # the fitImage:
        if d.getVar('UBOOT_SIGN_ENABLE') == "1" and d.getVar('UBOOT_DTB_BINARY'):
            uboot_pn = d.getVar('PREFERRED_PROVIDER_u-boot') or 'u-boot'
            d.appendVarFlag('do_assemble_fitimage', 'depends', ' %s:do_populate_sysroot' % uboot_pn)
            if d.getVar('INITRAMFS_IMAGE_BUNDLE') == "1":
                d.appendVarFlag('do_assemble_fitimage_initramfs', 'depends', ' %s:do_populate_sysroot' % uboot_pn)
}


# Description string
FIT_DESC ?= "Kernel fitImage for ${DISTRO_NAME}/${PV}/${MACHINE}"

# Sign individual images as well
FIT_SIGN_INDIVIDUAL ?= "0"

# Keys used to sign individually image nodes.
# The keys to sign image nodes must be different from those used to sign
# configuration nodes, otherwise the "required" property, from
# UBOOT_DTB_BINARY, will be set to "conf", because "conf" prevails on "image".
# Then the images signature checking will not be mandatory and no error will be
# raised in case of failure.
# UBOOT_SIGN_IMG_KEYNAME = "dev2" # keys name in keydir (eg. "dev2.crt", "dev2.key")

#
# Emit the fitImage ITS header
#
# $1 ... .its filename
fitimage_emit_fit_header() {
	cat << EOF >> $1
/dts-v1/;

/ {
        description = "${FIT_DESC}";
        #address-cells = <1>;
EOF
}

#
# Emit the fitImage section bits
#
# $1 ... .its filename
# $2 ... Section bit type: imagestart - image section start
#                          confstart  - configuration section start
#                          sectend    - section end
#                          fitend     - fitimage end
#
fitimage_emit_section_maint() {
	case $2 in
	imagestart)
		cat << EOF >> $1

        images {
EOF
	;;
	confstart)
		cat << EOF >> $1

        configurations {
EOF
	;;
	sectend)
		cat << EOF >> $1
	};
EOF
	;;
	fitend)
		cat << EOF >> $1
};
EOF
	;;
	esac
}

#
# Emit the fitImage ITS kernel section
#
# $1 ... .its filename
# $2 ... Image counter
# $3 ... Path to kernel image
# $4 ... Compression type
fitimage_emit_section_kernel() {

	kernel_csum="${FIT_HASH_ALG}"
	kernel_sign_algo="${FIT_SIGN_ALG}"
	kernel_sign_keyname="${UBOOT_SIGN_IMG_KEYNAME}"

	ENTRYPOINT="${UBOOT_ENTRYPOINT}"
	if [ -n "${UBOOT_ENTRYSYMBOL}" ]; then
		ENTRYPOINT=`${HOST_PREFIX}nm vmlinux | \
			awk '$3=="${UBOOT_ENTRYSYMBOL}" {print "0x"$1;exit}'`
	fi

	cat << EOF >> $1
                kernel-$2 {
                        description = "Linux kernel";
                        data = /incbin/("$3");
                        type = "kernel";
                        arch = "${UBOOT_ARCH}";
                        os = "linux";
                        compression = "$4";
                        load = <${UBOOT_LOADADDRESS}>;
                        entry = <$ENTRYPOINT>;
                        hash-1 {
                                algo = "$kernel_csum";
                        };
                };
EOF

	if [ "${UBOOT_SIGN_ENABLE}" = "1" -a "${FIT_SIGN_INDIVIDUAL}" = "1" -a -n "$kernel_sign_keyname" ] ; then
		sed -i '$ d' $1
		cat << EOF >> $1
                        signature-1 {
                                algo = "$kernel_csum,$kernel_sign_algo";
                                key-name-hint = "$kernel_sign_keyname";
                        };
                };
EOF
	fi
}

#
# Emit the fitImage ITS DTB section
#
# $1 ... .its filename
# $2 ... Image counter
# $3 ... Path to DTB image
fitimage_emit_section_dtb() {

	dtb_csum="${FIT_HASH_ALG}"
	dtb_sign_algo="${FIT_SIGN_ALG}"
	dtb_sign_keyname="${UBOOT_SIGN_IMG_KEYNAME}"

	dtb_loadline=""
	dtb_ext=${DTB##*.}
	if [ "${dtb_ext}" = "dtbo" ]; then
		if [ -n "${UBOOT_DTBO_LOADADDRESS}" ]; then
			dtb_loadline="load = <${UBOOT_DTBO_LOADADDRESS}>;"
		fi
	elif [ -n "${UBOOT_DTB_LOADADDRESS}" ]; then
		dtb_loadline="load = <${UBOOT_DTB_LOADADDRESS}>;"
	fi
	cat << EOF >> $1
                fdt-$2 {
                        description = "Flattened Device Tree blob";
                        data = /incbin/("$3");
                        type = "flat_dt";
                        arch = "${UBOOT_ARCH}";
                        compression = "none";
                        $dtb_loadline
                        hash-1 {
                                algo = "$dtb_csum";
                        };
                };
EOF

	if [ "${UBOOT_SIGN_ENABLE}" = "1" -a "${FIT_SIGN_INDIVIDUAL}" = "1" -a -n "$dtb_sign_keyname" ] ; then
		sed -i '$ d' $1
		cat << EOF >> $1
                        signature-1 {
                                algo = "$dtb_csum,$dtb_sign_algo";
                                key-name-hint = "$dtb_sign_keyname";
                        };
                };
EOF
	fi
}

#
# Emit the fitImage ITS u-boot script section
#
# $1 ... .its filename
# $2 ... Image counter
# $3 ... Path to boot script image
fitimage_emit_section_boot_script() {

	bootscr_csum="${FIT_HASH_ALG}"
	bootscr_sign_algo="${FIT_SIGN_ALG}"
	bootscr_sign_keyname="${UBOOT_SIGN_IMG_KEYNAME}"

        cat << EOF >> $1
                bootscr-$2 {
                        description = "U-boot script";
                        data = /incbin/("$3");
                        type = "script";
                        arch = "${UBOOT_ARCH}";
                        compression = "none";
                        hash-1 {
                                algo = "$bootscr_csum";
                        };
                };
EOF

	if [ "${UBOOT_SIGN_ENABLE}" = "1" -a "${FIT_SIGN_INDIVIDUAL}" = "1" -a -n "$bootscr_sign_keyname" ] ; then
		sed -i '$ d' $1
		cat << EOF >> $1
                        signature-1 {
                                algo = "$bootscr_csum,$bootscr_sign_algo";
                                key-name-hint = "$bootscr_sign_keyname";
                        };
                };
EOF
	fi
}

#
# Emit the fitImage ITS setup section
#
# $1 ... .its filename
# $2 ... Image counter
# $3 ... Path to setup image
fitimage_emit_section_setup() {

	setup_csum="${FIT_HASH_ALG}"

	cat << EOF >> $1
                setup-$2 {
                        description = "Linux setup.bin";
                        data = /incbin/("$3");
                        type = "x86_setup";
                        arch = "${UBOOT_ARCH}";
                        os = "linux";
                        compression = "none";
                        load = <0x00090000>;
                        entry = <0x00090000>;
                        hash-1 {
                                algo = "$setup_csum";
                        };
                };
EOF
}

#
# Emit the fitImage ITS ramdisk section
#
# $1 ... .its filename
# $2 ... Image counter
# $3 ... Path to ramdisk image
fitimage_emit_section_ramdisk() {

	ramdisk_csum="${FIT_HASH_ALG}"
	ramdisk_sign_algo="${FIT_SIGN_ALG}"
	ramdisk_sign_keyname="${UBOOT_SIGN_IMG_KEYNAME}"
	ramdisk_loadline=""
	ramdisk_entryline=""

	if [ -n "${UBOOT_RD_LOADADDRESS}" ]; then
		ramdisk_loadline="load = <${UBOOT_RD_LOADADDRESS}>;"
	fi
	if [ -n "${UBOOT_RD_ENTRYPOINT}" ]; then
		ramdisk_entryline="entry = <${UBOOT_RD_ENTRYPOINT}>;"
	fi

	cat << EOF >> $1
                ramdisk-$2 {
                        description = "${INITRAMFS_IMAGE}";
                        data = /incbin/("$3");
                        type = "ramdisk";
                        arch = "${UBOOT_ARCH}";
                        os = "linux";
                        compression = "none";
                        $ramdisk_loadline
                        $ramdisk_entryline
                        hash-1 {
                                algo = "$ramdisk_csum";
                        };
                };
EOF

	if [ "${UBOOT_SIGN_ENABLE}" = "1" -a "${FIT_SIGN_INDIVIDUAL}" = "1" -a -n "$ramdisk_sign_keyname" ] ; then
		sed -i '$ d' $1
		cat << EOF >> $1
                        signature-1 {
                                algo = "$ramdisk_csum,$ramdisk_sign_algo";
                                key-name-hint = "$ramdisk_sign_keyname";
                        };
                };
EOF
	fi
}

#
# Emit the fitImage ITS configuration section
#
# $1 ... .its filename
# $2 ... Linux kernel ID
# $3 ... DTB image name
# $4 ... ramdisk ID
# $5 ... u-boot script ID
# $6 ... config ID
# $7 ... default flag
fitimage_emit_section_config() {

	conf_csum="${FIT_HASH_ALG}"
	conf_sign_algo="${FIT_SIGN_ALG}"
	if [ "${UBOOT_SIGN_ENABLE}" = "1" ] ; then
		conf_sign_keyname="${UBOOT_SIGN_KEYNAME}"
	fi

	its_file="$1"
	kernel_id="$2"
	dtb_image="$3"
	ramdisk_id="$4"
	bootscr_id="$5"
	config_id="$6"
	default_flag="$7"

	# Test if we have any DTBs at all
	sep=""
	conf_desc=""
	conf_node="conf-"
	kernel_line=""
	fdt_line=""
	ramdisk_line=""
	bootscr_line=""
	setup_line=""
	default_line=""

	# conf node name is selected based on dtb ID if it is present,
	# otherwise its selected based on kernel ID
	if [ -n "$dtb_image" ]; then
		conf_node=$conf_node$dtb_image
	else
		conf_node=$conf_node$kernel_id
	fi

	if [ -n "$kernel_id" ]; then
		conf_desc="Linux kernel"
		sep=", "
		kernel_line="kernel = \"kernel-$kernel_id\";"
	fi

	if [ -n "$dtb_image" ]; then
		conf_desc="$conf_desc${sep}FDT blob"
		sep=", "
		fdt_line="fdt = \"fdt-$dtb_image\";"
	fi

	if [ -n "$ramdisk_id" ]; then
		conf_desc="$conf_desc${sep}ramdisk"
		sep=", "
		ramdisk_line="ramdisk = \"ramdisk-$ramdisk_id\";"
	fi

	if [ -n "$bootscr_id" ]; then
		conf_desc="$conf_desc${sep}u-boot script"
		sep=", "
		bootscr_line="bootscr = \"bootscr-$bootscr_id\";"
	fi

	if [ -n "$config_id" ]; then
		conf_desc="$conf_desc${sep}setup"
		setup_line="setup = \"setup-$config_id\";"
	fi

	if [ "$default_flag" = "1" ]; then
		# default node is selected based on dtb ID if it is present,
		# otherwise its selected based on kernel ID
		if [ -n "$dtb_image" ]; then
			default_line="default = \"conf-$dtb_image\";"
		else
			default_line="default = \"conf-$kernel_id\";"
		fi
	fi

	cat << EOF >> $its_file
                $default_line
                $conf_node {
                        description = "$default_flag $conf_desc";
                        $kernel_line
                        $fdt_line
                        $ramdisk_line
                        $bootscr_line
                        $setup_line
                        hash-1 {
                                algo = "$conf_csum";
                        };
EOF

	if [ -n "$conf_sign_keyname" ] ; then

		sign_line="sign-images = "
		sep=""

		if [ -n "$kernel_id" ]; then
			sign_line="$sign_line${sep}\"kernel\""
			sep=", "
		fi

		if [ -n "$dtb_image" ]; then
			sign_line="$sign_line${sep}\"fdt\""
			sep=", "
		fi

		if [ -n "$ramdisk_id" ]; then
			sign_line="$sign_line${sep}\"ramdisk\""
			sep=", "
		fi

		if [ -n "$bootscr_id" ]; then
			sign_line="$sign_line${sep}\"bootscr\""
			sep=", "
		fi

		if [ -n "$config_id" ]; then
			sign_line="$sign_line${sep}\"setup\""
		fi

		sign_line="$sign_line;"

		cat << EOF >> $its_file
                        signature-1 {
                                algo = "$conf_csum,$conf_sign_algo";
                                key-name-hint = "$conf_sign_keyname";
                                $sign_line
                        };
EOF
	fi

	cat << EOF >> $its_file
                };
EOF
}

#
# Assemble fitImage
#
# $1 ... .its filename
# $2 ... fitImage name
# $3 ... include ramdisk
fitimage_assemble() {
	kernelcount=1
	dtbcount=""
	DTBS=""
	ramdiskcount=$3
	setupcount=""
	bootscr_id=""
	rm -f $1 arch/${ARCH}/boot/$2

	if [ -n "${UBOOT_SIGN_IMG_KEYNAME}" -a "${UBOOT_SIGN_KEYNAME}" = "${UBOOT_SIGN_IMG_KEYNAME}" ]; then
		bbfatal "Keys used to sign images and configuration nodes must be different."
	fi

	fitimage_emit_fit_header $1

	#
	# Step 1: Prepare a kernel image section.
	#
	fitimage_emit_section_maint $1 imagestart

	uboot_prep_kimage
	fitimage_emit_section_kernel $1 $kernelcount linux.bin "$linux_comp"

	#
	# Step 2: Prepare a DTB image section
	#

	if [ -n "${KERNEL_DEVICETREE}" ]; then
		dtbcount=1
		for DTB in ${KERNEL_DEVICETREE}; do
			if echo $DTB | grep -q '/dts/'; then
				bbwarn "$DTB contains the full path to the the dts file, but only the dtb name should be used."
				DTB=`basename $DTB | sed 's,\.dts$,.dtb,g'`
			fi

			# Skip ${DTB} if it's also provided in ${EXTERNAL_KERNEL_DEVICETREE}
			if [ -n "${EXTERNAL_KERNEL_DEVICETREE}" ] && [ -s ${EXTERNAL_KERNEL_DEVICETREE}/${DTB} ]; then
				continue
			fi

			DTB_PATH="arch/${ARCH}/boot/dts/$DTB"
			if [ ! -e "$DTB_PATH" ]; then
				DTB_PATH="arch/${ARCH}/boot/$DTB"
			fi

			DTB=$(echo "$DTB" | tr '/' '_')
			DTBS="$DTBS $DTB"
			fitimage_emit_section_dtb $1 $DTB $DTB_PATH
		done
	fi

	if [ -n "${EXTERNAL_KERNEL_DEVICETREE}" ]; then
		dtbcount=1
		for DTB in $(find "${EXTERNAL_KERNEL_DEVICETREE}" \( -name '*.dtb' -o -name '*.dtbo' \) -printf '%P\n' | sort); do
			DTB=$(echo "$DTB" | tr '/' '_')
			DTBS="$DTBS $DTB"
			fitimage_emit_section_dtb $1 $DTB "${EXTERNAL_KERNEL_DEVICETREE}/$DTB"
		done
	fi

	#
	# Step 3: Prepare a u-boot script section
	#

	if [ -n "${UBOOT_ENV}" ] && [ -d "${STAGING_DIR_HOST}/boot" ]; then
		if [ -e "${STAGING_DIR_HOST}/boot/${UBOOT_ENV_BINARY}" ]; then
			cp ${STAGING_DIR_HOST}/boot/${UBOOT_ENV_BINARY} ${B}
			bootscr_id="${UBOOT_ENV_BINARY}"
			fitimage_emit_section_boot_script $1 "$bootscr_id" ${UBOOT_ENV_BINARY}
		else
			bbwarn "${STAGING_DIR_HOST}/boot/${UBOOT_ENV_BINARY} not found."
		fi
	fi

	#
	# Step 4: Prepare a setup section. (For x86)
	#
	if [ -e arch/${ARCH}/boot/setup.bin ]; then
		setupcount=1
		fitimage_emit_section_setup $1 $setupcount arch/${ARCH}/boot/setup.bin
	fi

	#
	# Step 5: Prepare a ramdisk section.
	#
	if [ "x${ramdiskcount}" = "x1" ] && [ "${INITRAMFS_IMAGE_BUNDLE}" != "1" ]; then
		# Find and use the first initramfs image archive type we find
		for img in cpio.lz4 cpio.lzo cpio.lzma cpio.xz cpio.zst cpio.gz ext2.gz cpio; do
			initramfs_path="${DEPLOY_DIR_IMAGE}/${INITRAMFS_IMAGE_NAME}.$img"
			echo -n "Searching for $initramfs_path..."
			if [ -e "$initramfs_path" ]; then
				echo "found"
				fitimage_emit_section_ramdisk $1 "$ramdiskcount" "$initramfs_path"
				break
			else
				echo "not found"
			fi
		done
	fi

	fitimage_emit_section_maint $1 sectend

	# Force the first Kernel and DTB in the default config
	kernelcount=1
	if [ -n "$dtbcount" ]; then
		dtbcount=1
	fi

	#
	# Step 6: Prepare a configurations section
	#
	fitimage_emit_section_maint $1 confstart

	# kernel-fitimage.bbclass currently only supports a single kernel (no less or
	# more) to be added to the FIT image along with 0 or more device trees and
	# 0 or 1 ramdisk.
        # It is also possible to include an initramfs bundle (kernel and rootfs in one binary)
        # When the initramfs bundle is used ramdisk is disabled.
	# If a device tree is to be part of the FIT image, then select
	# the default configuration to be used is based on the dtbcount. If there is
	# no dtb present than select the default configuation to be based on
	# the kernelcount.
	if [ -n "$DTBS" ]; then
		i=1
		for DTB in ${DTBS}; do
			dtb_ext=${DTB##*.}
			if [ "$dtb_ext" = "dtbo" ]; then
				fitimage_emit_section_config $1 "" "$DTB" "" "$bootscr_id" "" "`expr $i = $dtbcount`"
			else
				fitimage_emit_section_config $1 $kernelcount "$DTB" "$ramdiskcount" "$bootscr_id" "$setupcount" "`expr $i = $dtbcount`"
			fi
			i=`expr $i + 1`
		done
	else
		defaultconfigcount=1
		fitimage_emit_section_config $1 $kernelcount "" "$ramdiskcount" "$bootscr_id"  "$setupcount" $defaultconfigcount
	fi

	fitimage_emit_section_maint $1 sectend

	fitimage_emit_section_maint $1 fitend

	#
	# Step 7: Assemble the image
	#
	${UBOOT_MKIMAGE} \
		${@'-D "${UBOOT_MKIMAGE_DTCOPTS}"' if len('${UBOOT_MKIMAGE_DTCOPTS}') else ''} \
		-f $1 \
		arch/${ARCH}/boot/$2

	#
	# Step 8: Sign the image and add public key to U-Boot dtb
	#
	if [ "x${UBOOT_SIGN_ENABLE}" = "x1" ] ; then
		add_key_to_u_boot=""
		if [ -n "${UBOOT_DTB_BINARY}" ]; then
			# The u-boot.dtb is a symlink to UBOOT_DTB_IMAGE, so we need copy
			# both of them, and don't dereference the symlink.
			cp -P ${STAGING_DATADIR}/u-boot*.dtb ${B}
			add_key_to_u_boot="-K ${B}/${UBOOT_DTB_BINARY}"
		fi
		${UBOOT_MKIMAGE_SIGN} \
			${@'-D "${UBOOT_MKIMAGE_DTCOPTS}"' if len('${UBOOT_MKIMAGE_DTCOPTS}') else ''} \
			-F -k "${UBOOT_SIGN_KEYDIR}" \
			$add_key_to_u_boot \
			-r arch/${ARCH}/boot/$2 \
			${UBOOT_MKIMAGE_SIGN_ARGS}
	fi
}

do_assemble_fitimage() {
	if echo ${KERNEL_IMAGETYPES} | grep -wq "fitImage"; then
		cd ${B}
		fitimage_assemble fit-image.its fitImage ""
	fi
}

addtask assemble_fitimage before do_install after do_compile

do_assemble_fitimage_initramfs() {
	if echo ${KERNEL_IMAGETYPES} | grep -wq "fitImage" && \
		test -n "${INITRAMFS_IMAGE}" ; then
		cd ${B}
		if [ "${INITRAMFS_IMAGE_BUNDLE}" = "1" ]; then
			fitimage_assemble fit-image-${INITRAMFS_IMAGE}.its fitImage ""
		else
			fitimage_assemble fit-image-${INITRAMFS_IMAGE}.its fitImage-${INITRAMFS_IMAGE} 1
		fi
	fi
}

addtask assemble_fitimage_initramfs before do_deploy after do_bundle_initramfs

do_kernel_generate_rsa_keys() {
	if [ "${UBOOT_SIGN_ENABLE}" = "0" ] && [ "${FIT_GENERATE_KEYS}" = "1" ]; then
		bbwarn "FIT_GENERATE_KEYS is set to 1 even though UBOOT_SIGN_ENABLE is set to 0. The keys will not be generated as they won't be used."
	fi

	if [ "${UBOOT_SIGN_ENABLE}" = "1" ] && [ "${FIT_GENERATE_KEYS}" = "1" ]; then

		# Generate keys to sign configuration nodes, only if they don't already exist
		if [ ! -f "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".key ] || \
			[ ! -f "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".crt ]; then

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

			echo "Generating RSA private key for signing fitImage"
			openssl genrsa ${FIT_KEY_GENRSA_ARGS} -out \
				"${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".key \
			"${FIT_SIGN_NUMBITS}"

			echo "Generating certificate for signing fitImage"
			openssl req ${FIT_KEY_REQ_ARGS} "${FIT_KEY_SIGN_PKCS}" \
				-key "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".key \
				-out "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_KEYNAME}".crt
		fi

		# Generate keys to sign image nodes, only if they don't already exist
		if [ ! -f "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_IMG_KEYNAME}".key ] || \
			[ ! -f "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_IMG_KEYNAME}".crt ]; then

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

			echo "Generating RSA private key for signing fitImage"
			openssl genrsa ${FIT_KEY_GENRSA_ARGS} -out \
				"${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_IMG_KEYNAME}".key \
			"${FIT_SIGN_NUMBITS}"

			echo "Generating certificate for signing fitImage"
			openssl req ${FIT_KEY_REQ_ARGS} "${FIT_KEY_SIGN_PKCS}" \
				-key "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_IMG_KEYNAME}".key \
				-out "${UBOOT_SIGN_KEYDIR}/${UBOOT_SIGN_IMG_KEYNAME}".crt
		fi
	fi
}

addtask kernel_generate_rsa_keys before do_assemble_fitimage after do_compile

kernel_do_deploy[vardepsexclude] = "DATETIME"
kernel_do_deploy:append() {
	# Update deploy directory
	if echo ${KERNEL_IMAGETYPES} | grep -wq "fitImage"; then

		if [ "${INITRAMFS_IMAGE_BUNDLE}" != "1" ]; then
			echo "Copying fit-image.its source file..."
			install -m 0644 ${B}/fit-image.its "$deployDir/fitImage-its-${KERNEL_FIT_NAME}.its"
			ln -snf fitImage-its-${KERNEL_FIT_NAME}.its "$deployDir/fitImage-its-${KERNEL_FIT_LINK_NAME}"

			echo "Copying linux.bin file..."
			install -m 0644 ${B}/linux.bin $deployDir/fitImage-linux.bin-${KERNEL_FIT_NAME}.bin
			ln -snf fitImage-linux.bin-${KERNEL_FIT_NAME}.bin "$deployDir/fitImage-linux.bin-${KERNEL_FIT_LINK_NAME}"
		fi

		if [ -n "${INITRAMFS_IMAGE}" ]; then
			echo "Copying fit-image-${INITRAMFS_IMAGE}.its source file..."
			install -m 0644 ${B}/fit-image-${INITRAMFS_IMAGE}.its "$deployDir/fitImage-its-${INITRAMFS_IMAGE_NAME}-${KERNEL_FIT_NAME}.its"
			ln -snf fitImage-its-${INITRAMFS_IMAGE_NAME}-${KERNEL_FIT_NAME}.its "$deployDir/fitImage-its-${INITRAMFS_IMAGE_NAME}-${KERNEL_FIT_LINK_NAME}"

			if [ "${INITRAMFS_IMAGE_BUNDLE}" != "1" ]; then
				echo "Copying fitImage-${INITRAMFS_IMAGE} file..."
				install -m 0644 ${B}/arch/${ARCH}/boot/fitImage-${INITRAMFS_IMAGE} "$deployDir/fitImage-${INITRAMFS_IMAGE_NAME}-${KERNEL_FIT_NAME}.bin"
				ln -snf fitImage-${INITRAMFS_IMAGE_NAME}-${KERNEL_FIT_NAME}.bin "$deployDir/fitImage-${INITRAMFS_IMAGE_NAME}-${KERNEL_FIT_LINK_NAME}"
			fi
		fi
	fi
	if [ "${UBOOT_SIGN_ENABLE}" = "1" -o "${UBOOT_FITIMAGE_ENABLE}" = "1" ] && \
	   [ -n "${UBOOT_DTB_BINARY}" ] ; then
		# UBOOT_DTB_IMAGE is a realfile, but we can't use
		# ${UBOOT_DTB_IMAGE} since it contains ${PV} which is aimed
		# for u-boot, but we are in kernel env now.
		install -m 0644 ${B}/u-boot-${MACHINE}*.dtb "$deployDir/"
	fi
	if [ "${UBOOT_FITIMAGE_ENABLE}" = "1" -a -n "${UBOOT_BINARY}" -a -n "${SPL_DTB_BINARY}" ] ; then
		# If we're also creating and/or signing the uboot fit, now we need to
		# deploy it, it's its file, as well as u-boot-spl.dtb
		install -m 0644 ${B}/u-boot-spl-${MACHINE}*.dtb "$deployDir/"
		echo "Copying u-boot-fitImage file..."
		install -m 0644 ${B}/u-boot-fitImage-* "$deployDir/"
		echo "Copying u-boot-its file..."
		install -m 0644 ${B}/u-boot-its-* "$deployDir/"
	fi
}

# The function below performs the following in case of initramfs bundles:
# - Removes do_assemble_fitimage. FIT generation is done through
#   do_assemble_fitimage_initramfs. do_assemble_fitimage is not needed
#   and should not be part of the tasks to be executed.
# - Since do_kernel_generate_rsa_keys is inserted by default
#   between do_compile and do_assemble_fitimage, this is
#   not suitable in case of initramfs bundles.  do_kernel_generate_rsa_keys
#   should be between do_bundle_initramfs and do_assemble_fitimage_initramfs.
python () {
    if d.getVar('INITRAMFS_IMAGE_BUNDLE') == "1":
        bb.build.deltask('do_assemble_fitimage', d)
        bb.build.deltask('kernel_generate_rsa_keys', d)
        bb.build.addtask('kernel_generate_rsa_keys', 'do_assemble_fitimage_initramfs', 'do_bundle_initramfs', d)
}