The source tree has been available for a few months and is being used by OSMC and OpenELEC, as well as "BRANCH=next rpi-update".
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Please report if there are any regressions compared to the 4.1 kernel. If testing is positive it will appear in "apt-get upgrade" and on new raspbian images in the near future.
The default source tree on https://github.com/raspberrypi/linux is now rpi-4.4.y. This tree is now considered the stable kernel source tree and will merge in minor bumps to the kernel version, rather than rebase.
There is now a 4.5 kernel tree where more experimental kernel commits may go (in general moving closer to upstream).
Device tree is required for 4.4 kernel. Settings like "dtoverlay=" to disable device tree will cause failure to boot.
Device tree is now assumed if a kernel doesn't have a trailer. If you are using latest firmware with a different kernel that doesn't use device tree,
then use mkknlimg to indicate you aren't using device tree, or add "device_tree=" to config.txt to disable it.