Yes this is related to device tree, I hit it a few weeks back with a new 
install.  After a lot of digging around I got an answer on the Pi forum, 
things have changed and you now need to add

dtparam=i2c1=on
dtparam=i2c0=on

to the end of /boot/config.txt  for details see
http://www.raspberrypi.org/forums/viewtopic.php?f=28&t=97639&p=677652#p677652 


There may be other possible better ways to do it, I guess a full 
understanding of the device tree is the best way forward, but this works 
and there are other ways I can spend my time :)

Mick

On 23/02/15 08:37, Jaroslav SOBOTA wrote:
> Hi everybody,
> I have problems getting OWFS running on Raspberry Pi and according to
> the Raspberry Pi forums I'm not alone. It seems that the problems
> occurred after Raspbian switched to device tree but I'm no Linux expert.
> Can you please have a look at the following posts? Any help would be
> welcome.
>
> http://www.raspberrypi.org/forums/viewtopic.php?f=44&t=98772&p=702468
>
> http://www.raspberrypi.org/forums/viewtopic.php?f=66&t=101046&p=702469
>
> Thank you!
>
> Jaroslav
>
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