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/usr/share/arduino/hardware/mighty-1284p/boards.txt is in arduino-mighty-1284p 1-2.

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##############################################################

mighty_opt.name=Mighty 1284p using Optiboot
mighty_opt.upload.protocol=arduino
mighty_opt.upload.maximum_size=130048
mighty_opt.upload.speed=115200
mighty_opt.bootloader.low_fuses=0xff
mighty_opt.bootloader.high_fuses=0xde
mighty_opt.bootloader.extended_fuses=0xfd
mighty_opt.bootloader.path=optiboot
mighty_opt.bootloader.file=optiboot_atmega1284p.hex
mighty_opt.bootloader.unlock_bits=0x3F
mighty_opt.bootloader.lock_bits=0x0F
mighty_opt.build.mcu=atmega1284p
mighty_opt.build.f_cpu=16000000L
mighty_opt.build.core=arduino:arduino
mighty_opt.build.variant=standard

##############################################################

mighty.name=Original Mighty 1284p
mighty.upload.protocol=stk500v1
mighty.upload.maximum_size=129024
mighty.upload.speed=57600
mighty.bootloader.low_fuses=0xff
mighty.bootloader.high_fuses=0xdc
mighty.bootloader.extended_fuses=0xfd
mighty.bootloader.path=standard
mighty.bootloader.file=ATmegaBOOT_1284P.hex
mighty.bootloader.unlock_bits=0x3F
mighty.bootloader.lock_bits=0x0F
mighty.build.mcu=atmega1284p
mighty.build.f_cpu=16000000L
mighty.build.core=arduino:arduino
mighty.build.variant=standard