can i run Atmega1284P at 3.3V and 8Mhz speed.? can i burn Nick Gammon Arduino bootloaders into the chip.?
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Atmega1284P 8MHz @ 3.3V?
Yes, you can. Documentation states this is permitted voltage for that frequency: 0 - 10MHz @ 2.7V - 5.5V http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-42719-ATmega1284P_Datasheet.pdf
Nick Gammon Arduino bootloaders?
On this page http://www.gammon.com.au/bootloader it states Atmega1284. In code https://github.com/nickgammon/arduino_sketches/blob/master/Atmega_Self_Read_Signature/Atmega_Self_Read_Signature.ino there is signature for Atmega1284P so it should work without issues.