On Thu, Feb 10, 2011 at 1:11 AM, Giovanni C <ucasano@gmail.com> wrote:
I would like to know the minimum switching time of GPIO in gumstix overo
For my application, I would like reach the 0.01 nanoseconds, but maybe 0.5
or 0.1 nanoseconds
could be fine, too.

No way.  0.5 nanosecond period oscillations is 2 gigahertz:  There's no way a 600mhz ARM chip can accurately time that, ignoring all other factors.