Though you cannot avoid searching TRM, Technical Reference Manual, you can get 
some help on this site.

http://derekmolloy.ie/gpios-on-the-beaglebone-black-using-device-tree-overlays/

Sent from my iPad

> On Mar 28, 2014, at 9:08 PM, Charles Steinkuehler <char...@steinkuehler.net> 
> wrote:
> 
>> On 3/28/2014 6:47 AM, Dacobi wrote:
>> I'm trying to speed up some PWM IO code by reading/writing straight through 
>> /dev/mem
>> 
>> I found an example that toggles a led, but non that read GPIO as input.
>> 
>> Can anyone point me to an example or some documentation of the GPIO's 
>> physical memory addresses?
> 
> You want the AM335x Technical Reference Manual from TI.
> 
> -- 
> Charles Steinkuehler
> char...@steinkuehler.net
> 
> -- 
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