How to integrated mender within lk-bootloader base-on Yocto Project - yocto

Question

I am new for yocto ,now I use a MTK-demo-board to build a linux-distro base on Yocto. I want to realize OTA by mender followed this tutorial:https://docs.mender.io/1.0/Devices/Integrating-with-U-Boot.
but Mender support u-boot as bootloader by default, the MTK use lk bootloader,Then how to realize this function?
The AP which I used is MT8183,The steps I have done list below:
1. /meta/meta-mediatek/recipes-bsp/lk/lk_2.0.0.0.bb . add follow code:
require recipes-bsp/u-boot/u-boot-mender.inc
PROVIDES += "u-boot"
RPROVIDES_{PN} += "u-boot"
2.cp lk_2.0.0.0 lk-fw-utils_2.0.0.0,and changed the file as behind:
a. delete do_genkey{} function;
b. add EXTRA_OEMAKE_class-target = 'CROSS_COMPILE=${TARGET_PREFIX} CC="${CC} ${CFLAGS} ${LDFLAGS}" V=1'
c. add "oe_runmake env" in function do_compile()
d. add PROVIDES_${PN} = "lk-fw-utils"
RPROVIDES_${PN} = "lk-fw-utils"
DEPENDS += "mtd-utils"
3./build/local.conf,add these code
MENDER_ARTIFACT_NAME = "release-1"
INHERIT += "mender-full"
MACHINE = "aiv8183m1v2"
PREFERRED_VERSION_pn-mender = "1.0.%"
PREFERRED_VERSION_pn-mender-artifact = "1.0.%"
PREFERRED_VERSION_pn-mender-artifact-native = "1.0.%"
DISTRO_FEATURES_append = "systemd"
VIRTUAL-RUNTIME_init_manager = "systemed"
DISTRO_FEATURES_BACKFILL_CONSIDERED = "sysvinit"
VIRTUAL-RUNTIME_initscripts = ""
IMAGE_FSTYPES = "ext4"
4.execute bitbake-layers add-layer /meta/meta-mender/meta-mender-core
5.bitbake-layers create-layer meta-mylayer,in this layer,I mkdir -p /recipes-mender/mender/files, in directory mender,I touch mender_%.bbappend file as bellow:
FILESEXTARPATHS_prepend := "${THISDIR}/file:"
SRC_URI_append = "file://server.crt"
and put servert.crt in the the file directory.
6.in the mancine.conf(aiv8183m1v2.conf),I have added
PREFERRED_PROVIDER_u-boot-fw-utils = "lk-fw-utils"
PREFERRED_PROVIDER_u-boot = "lk"
IMAGE_INSTALL_append = "kernel-modules"
MENDER_STORAGE_DEVICE = "/dev/mmcblk0"
7./meta-mender/meta-mender-core/classes/mender-full.bbclass
MENDER_FEATURES_ENABLE_append_arm = ""
MENDER_FEATURES_ENABLE_append_aarch64 = ""
the result I expected is the linux can OTA over mender.
But,actual results is the project can't cross build.the log says:
DEBUG: Executing shell function soft_link_to_rootfs
| ln: target ‘mender.bmap’ is not a directory
| WARNING: /home/yewkui/yocto-linux/build/tmp/work/aiv8183m1v2-poky-linux/mtk-image-openmm-aiv/1.0-r0/temp/run.soft_link_to_rootfs.1347217:1 exit 1 from 'ln -nfs mtk-image-openmm-aiv-aiv8183m1v2-20181224064735.rootfs.ext4 mender mender.bmap /home/yewkui/yocto-linux/build/tmp/deploy/images/aiv8183m1v2/rootfs.ext4 mender mender.bmap'
| DEBUG: Python function do_rootfs finished
| ERROR: Function failed: soft_link_to_rootfs (log file is located at /home/yewkui/yocto-linux/build/tmp/work/aiv8183m1v2-poky-linux/mtk-image-openmm-aiv/1.0-r0/temp/log.do_rootfs.1347217)
ERROR: Task (/home/yewkui/yocto-linux/meta/poky/../meta-mediatek-mt8183/recipes-aiv/images/mtk-image-openmm-aiv.bb:do_rootfs) failed with exit code '1'
NOTE: Tasks Summary: Attempted 2392 tasks of which 2391 didn't need to be rerun and 1 failed.
NOTE: Writing buildhistory
Maybe I am wrong at first step,but how to realize the OTA by yocto base on MTK lk-bootloader,please help! thanks a lot!