diff --git a/classes/image-overlay.bbclass b/classes/image-overlay.bbclass
index f0c4060..520ca6e 100644
--- a/classes/image-overlay.bbclass
+++ b/classes/image-overlay.bbclass
@@ -2,6 +2,7 @@
 EXCLUDE_FROM_WORLD = "1"
 
 INITRD_IMAGE ?= "obmc-phosphor-initramfs"
+INITRD_LINK_NAME = "${INITRD_IMAGE}-${MACHINE}${INITRAMFS_FSTYPE}"
 
 IMAGE_BASETYPE ?= "squashfs-xz"
 OVERLAY_BASETYPE ?= "jffs2"
@@ -13,7 +14,90 @@
 
 ROOTFS ?= "${DEPLOY_DIR_IMAGE}/${IMAGE_BASENAME}-${MACHINE}.${IMAGE_BASETYPE}"
 
+FLASH_IMAGE_NAME ?= "flash-${MACHINE}-${DATETIME}"
+FLASH_IMAGE_NAME[vardepsexclude] = "DATETIME"
+FLASH_IMAGE_LINK ?= "flash-${MACHINE}"
+
+FLASH_KERNEL_IMAGETYPE ?= "fitImage"
+
+FLASH_UBOOT_OFFSET ?= "0"
+FLASH_KERNEL_OFFSET ?= "512"
+FLASH_INITRD_OFFSET ?= "3072"
+FLASH_ROFS_OFFSET ?= "4864"
+FLASH_RWFS_OFFSET ?= "28672"
+RWFS_SIZE ?= "4096"
+
+# Allow rwfs mkfs configuration through OVERLAY_MKFS_OPTS and OVERRIDES. However,
+# avoid setting 'ext4' or 'jffs2' in OVERRIDES as such raw filesystem types are
+# reserved for the primary image (and setting them currently breaks the build).
+# Instead, prefix the overlay override value with 'rwfs-' to avoid collisions.
+DISTROOVERRIDES .= ":rwfs-${OVERLAY_BASETYPE}"
+
+OVERLAY_MKFS_OPTS_rwfs-ext4 = "-b 4096 -F -O^huge_file"
+
+# $(( ${FLASH_SIZE} - ${FLASH_RWFS_OFFSET} ))
+
+mk_nor_image() {
+       image_dst="$1"
+       image_size_kb=$2
+       dd if=/dev/zero bs=1k count=${image_size_kb} \
+              | tr '\000' '\377' > ${image_dst}
+}
+
+do_generate_flash() {
+       INITRD_CTYPE=${INITRAMFS_CTYPE}
+       ddir="${DEPLOY_DIR_IMAGE}"
+       kernel="${FLASH_KERNEL_IMAGETYPE}"
+       uboot="u-boot.${UBOOT_SUFFIX}"
+       uinitrd="${INITRD_LINK_NAME}.cpio.${INITRD_CTYPE}.u-boot"
+       rootfs="${IMAGE_LINK_NAME}.${IMAGE_BASETYPE}"
+       rwfs="rwfs.${OVERLAY_BASETYPE}"
+
+       if [ ! -f $ddir/$kernel ]; then
+              bbfatal "Kernel file ${ddir}/${kernel} does not exist"
+       fi
+       if [ ! -f $ddir/$uboot ]; then
+              bbfatal "U-boot file ${ddir}/${uboot} does not exist"
+       fi
+       if [ ! -f $ddir/$uinitrd ]; then
+              bbfatal "uinitrd file ${ddir}/${uinitrd} does not exist"
+       fi
+       if [ ! -f $ddir/$rootfs ]; then
+              bbfatal "Rootfs file ${ddir}/${rootfs} does not exist"
+       fi
+
+       mk_nor_image ${ddir}/${rwfs} ${RWFS_SIZE}
+       if [ "${OVERLAY_BASETYPE}" != jffs2 ]; then
+              mkfs.${OVERLAY_BASETYPE} ${OVERLAY_MKFS_OPTS} ${ddir}/${rwfs} || \
+                     bbfatal "mkfs rwfs"
+       fi
+
+       dst="${ddir}/${FLASH_IMAGE_NAME}"
+       rm -rf $dst
+       mk_nor_image ${dst} ${FLASH_SIZE}
+       dd if=${ddir}/${uboot} of=${dst} bs=1k conv=notrunc seek=${FLASH_UBOOT_OFFSET}
+       dd if=${ddir}/${kernel} of=${dst} bs=1k conv=notrunc seek=${FLASH_KERNEL_OFFSET}
+       dd if=${ddir}/${uinitrd} of=${dst} bs=1k conv=notrunc seek=${FLASH_INITRD_OFFSET}
+       dd if=${ddir}/${rootfs} of=${dst} bs=1k conv=notrunc seek=${FLASH_ROFS_OFFSET}
+       dd if=${ddir}/${rwfs} of=${dst} bs=1k conv=notrunc seek=${FLASH_RWFS_OFFSET}
+       dstlink="${ddir}/${FLASH_IMAGE_LINK}"
+       rm -rf $dstlink
+       ln -sf ${FLASH_IMAGE_NAME} $dstlink
+
+       ln -sf ${FLASH_IMAGE_NAME} ${ddir}/image-bmc
+       ln -sf ${uboot} ${ddir}/image-u-boot
+       ln -sf ${kernel} ${ddir}/image-kernel
+       ln -sf ${uinitrd} ${ddir}/image-initramfs
+       ln -sf ${rootfs} ${ddir}/image-rofs
+       ln -sf ${rwfs} ${ddir}/image-rwfs
+
+       tar -h -cvf ${ddir}/${MACHINE}-${DATETIME}.all.tar -C ${ddir} image-bmc
+       tar -h -cvf ${ddir}/${MACHINE}-${DATETIME}.tar -C ${ddir} image-u-boot image-kernel image-initramfs image-rofs image-rwfs
+}
+do_generate_flash[vardepsexclude] = "DATETIME"
+
 do_generate_flash[depends] += "${INITRD_IMAGE}:do_image_complete"
 do_generate_flash[depends] += "${PN}:do_image_complete"
+do_generate_flash[depends] += "u-boot:do_populate_sysroot"
 
 addtask generate_flash before do_build