[TriEmbed] Atmega fast startup

[Pete Soper]

Apropos Shane's discussion of trying to get an Atmega going quickly, I 
hacked a 328p to use the internal 8mhz clock with 0ms startup delay. 
Then I hacked the C runtime code to skip zeroing data, etc and instead 
go directly from the boot reset vector to setting the pin's DDR and the 
PORT high.  I triggered on the five volt supply coming up (yellow trace) 
and timed to the point where I could get a GPIO pin driven high (blue 
trace). It takes right at 400usec and is very repeatable.
-Pete

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