recently I read about problems to flash more than 128kb into the Atmega2560, which is due to the change from a two bit counter (up to 128kb) to a three bit counter (from 128kb onwards til 256kb).
I think it was the manpage of avrdude which says: ATmega2560, ATmega2561 Flash addressing above 128 KB is not supported by all programming hardware. Known to work are jtag2, stk500v2, and bit-bang pro‐ grammers.
The genuine Atmel/Microchip hardware "feels" a little to expensive...jtag is too complicated (and expensive) ... and what counts as "bitbanging programmer"... I know what bitbanging is (I think), but is using GPIOs bitbanging SPI instead hardware SPI the reason, why more than 128kb can be programmed?
Normally I use a simple FTDI-cable and the bootloader to flash stuff or my buspirate which acts as ISP in this case (bootloader flashing preferred, cause ISP overwrites the bootloader each time...).
Am I able to flash more than 128kb with this hardware? What do I need else?
Thanks a lot for any help in advance! Cheers mcc