I am working on the latest rpi kernel ie 3.18.0 and by enabling the device tree.
I compiled the source code and with that image and modules i am unable to boot.
I am getting a blank screen and its not booting.
I added the following into the config.txt even though i am unable to boot
device_tree=bcm2708-rpi-b.dtb
device_tree_address=0x100
kernel_address=0x8000
disable_commandline_tags=2
But with the image and modules that are given in the link https://github.com/raspberrypi/firmware/tree/next , it is booting well with the same config.txt file
and i also using the firmware that are from the link https://github.com/raspberrypi/firmware/tree/next
You need to tell the rpi bootloader that your kernel has device tree enabled. You can do it using the mkknlimg tool from the raspberrypi/tools repository, e.g.:
mkknlimg linux/arch/arm/boot/zImage kernel.img
This will add a trailer to the kernel, thus marking it as "device tree compatible".
来源：https://stackoverflow.com/questions/27542670/i-am-unable-to-boot-with-my-latest-rpi-3-18-0-kernel-and-enabling-the-device-tre