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By default the header Pin Nr. 7 us used by the 1-wire kernel module.

I would like to change it to a one of the 4 new GPIO Pins of an Rev 2 Pi.

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The kernel code for bitbanging 1wire on the RPi is a bit messy at the moment, multiple implementations exist. But unless I missed something completely, the only way to change this pin at this moment is to recompile the module, a name that keeps popping up in this context is 'Frank Buss', see for example this thread on the RPi forum –  ikku Feb 7 '13 at 12:04

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