我是yocto的新手，现在我使用MTK-demo-board在Yocto的基础上构建linux-distro。我想按照本教程https://docs.mender.io/1.0/Devices/Integrating-with-U-Boot的要求通过修补程序来实现OTA。
但是Mender在默认情况下支持u-boot作为引导程序，MTK使用lk引导程序，那么如何实现此功能？
我使用的AP是MT8183，我完成的步骤如下： 1. /meta/meta-mediatek/recipes-bsp/lk/lk_2.0.0.0.bb。添加关注代码：
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，并将文件更改如下：
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_${PN} = "lk-fw-utils"
DEPENDS += "mtd-utils"
3./build/local.conf，添加这些代码
MENDER_ARTIFACT_NAME = "release-1"
INHERIT += "mender-full"
MACHINE = "aiv8183m1v2"
PREFERRED_VERSION_pn-mender = "1.0.%"
PREFERRED_VERSION_pn-mender-artifact = "1.0.%"
PREFERRED_VERSION_pn-mender-artifact-native = "1.0.%"
DISTRO_FEATURES_append = "systemd"
VIRTUAL-RUNTIME_init_manager = "systemed"
DISTRO_FEATURES_BACKFILL_CONSIDERED = "sysvinit"
VIRTUAL-RUNTIME_initscripts = ""
IMAGE_FSTYPES = "ext4"
4。执行bitbake层添加层/ meta / meta-mender / meta-mender-core
5.bitbake-layers创建层meta-mylayer，在这一层中，我mkdir -p / recipes-mender / mender / files，在mender目录中，我触摸mender _％。bbappend文件如下：
FILESEXTARPATHS_prepend := "${THISDIR}/file:"
SRC_URI_append = "file://server.crt"
and put servert.crt in the the file directory.
6。在mancine.conf（aiv8183m1v2.conf）中，我已添加
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 = ""
我期望的结果是Linux可以在Mender上实现OTA。 但是，实际结果是该项目无法交叉构建。日志显示：
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
也许我第一步是错的，但是如何通过yocto在MTK lk-bootloader上实现OTA，请帮忙！非常感谢！