[avr-gcc-list] Calibrate internal RC oscilator FAQ

[max2009tiny]

Hi all, 
i read info about internal RC, but dont good understand how it work.
Here is 3 basic question:

1. when i program and select 4MHz internal RC osc. what OSCAL constatnt is
loaded by reset if Atmel have more constants from factory?

2. where in code can change OSCAL and where not

3. exist math function to recalc new OSCAL for a correct freq or only
probing?

If diference between Tiny Mega ... please write simply about this.
If have more info simply write...

Thanks Max.
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