device tree on rpi2 not working
tim at krieglstein.org
Tue Dec 15 13:18:11 PST 2015
I have already asked a similar question in the raspberry pi forum without an
answer so i figured that my question might be a bit to deeply technical for
the forums. Besides i am pretty exited about the work on the free graphics
driver and would really like to integrate that as time permits later on.
As a hobby project i have put some effort into putting a ptxdist based linux
distro for the rpi2 into shape. It allows developing with qt, opencv, 3d
accleration (old style) and camera drivers. The repository is at:
But when trying to integrate the pwm drivers i noticed that device tree is
somehow not working with my solution. Thats where i am stuck and i have no
idea whats wrong? I would be really happy if someone could give me a clue.
Thats what i have been trying out so far:
I have been using the kernel from
https://github.com/raspberrypi/linux.git branch rpi-4.1.y
I extracted a kernel config from a running raspian and got the /proc/config.gz
and used this for building the kernel. It boots and all but there is no
/proc/device-tree link as with raspbian and device tree overlays are not
working either. I know with high confidence by exchaning my kernel on a
raspbian installation that with my kernel the device tree initialization fails
even on raspbian. So i figure its most likely a kernel problem. But then the
kernel seems to have the device tree patches and my config is pretty close...
I also tried to find the original raspbian kernel but even so its running a
4.1 kernel an apt-source get linux-image only turned up older 3.x kernels and
i could not find any sources in the raspbian repositories which is strange.
It seems to me also that the pwm driver which i am after is also just fully
enabled by patches which have been seen on this list recently. And against
what kernel tree are all these patches?
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