Added the optiboot bootloader, uses only 512kB of FLASH Includes .hex file is for 20MHz µC Clock and serial speed of 57k6
This is the actual Sanguino release for Arduino 023. It has full ATmega1284p support. Reference: https://code.google.com/p/sanguino/downloads/detail?name=Sanguino-0023r4.zip&can=2&q=
ATmega644P 16MHz, ATmega1284p 8, 16, 20MHz