The yocto project testing:
"bitbake" the poky distribution with meta-raspberrypi layer for raspberrypi2 B+ board.
After I finished the build process successfully,
I use the following command to write the sd card
"sudo dd if=tmp/deploy/images/raspberrypi2/rpi-hwup-image-raspberrypi2.rpi-sdimg of=/dev/sdb bs=1M"
Then insert the sd card, something goes wrong with the boot process, it cannot boot with normal stuff.
Picture of the problems are as follows: