As mentioned in this topic:http://www.plugcomputer.org/plugforum/index.php?topic=163.0
there has been some success in connecting DS18B20 to the GPIO using kerneldriver.
I've been trying this for a while now but no success for me.
I've done the patches like adding the gpio pin I'm using to the GPIO pool
Registred the w1-gpio platform driver
Compiled a new kernel (2.39.1) with no errors
Loaded the w1-gpio module
Everything comes up great in the /sys/bus/w1 folder
With a oscilloscope I can see the my Dockstar polling the w1 bus but it looks like it doesn't changing the direction of the pin to input.
I see a minimal dip (0.1volt) when the slave tries to answer.
Pullup is the usual 5k that I've used with all other projects including the 18B20.
If I unload the w1-gpio module and try to use the pin manually, like setting it high, low, changing direction, reading. No problem.
The kernel seems to have full control over the pin.
Is there some one who has got it working and is willing to share their findings or maybe is there a better forum to ask this question in?