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does anyone tried to program the Arduino Mega with an FTDI chip like in the Arduino Nano (this is for a custom design) Will it work?

Thanks!

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That will work. The only think to look out for is how to reset the board. Either manually reset it before uploading, or connect the DTR pin of the FTDI, via a capacitor, to the reset pin. –  Gerben Mar 12 at 16:46

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The Arduino Mega already has a built-in USB-UART bridge, so there's no need for a separate chip.

The ATmega1280 on the other hand is just a bare AVR MCU and does require either a separate USB-UART bridge for serial programming (provided it is programmed with an appropriate bootloader) or an ISP programmer for ISP programming.

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Sorry, I expressed my self wrong. My goal is to program the Atmega2560 (with the bootloader already burned in) with the FTDI chip instead the AVR USB bridge from the Arduino Mega original design. Do you think that might work assuming the connections are correct? Or in other words, is the Arduino IDE expecting some sort of response from the programmer that the AVR bridge will provide and the FTDI will not? –  Arcu Mar 12 at 15:01
    
The FTDI chip is a USB-UART bridge, so I would expect not. But to be perfectly honest, I'd use a ISP programmer and save myself the cost of the bridge and the time of burning the bootloader. –  Ignacio Vazquez-Abrams Mar 12 at 15:29

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