As this has obviously stalled, here is another similar project using Petit-FatFs, theck out the sample project download link on the bottom of the page, inside there is a "AVR BOOT" example. http://elm-chan.org/fsw/ff/00index_p.html
I really dont know wich value I have to put in the BOOT_ADR field. Im using an Atmega328p
MCU_TARGET = atmega328p # Target device to be used (32K or lager)BOOT_ADR = 0x3800 # Boot loader start address [byte]F_CPU = 16000000 # CPU clock frequency [Hz]
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