I don't think the bootloader goes on the '8U2. It needs the USB to serial communications code. The code they put on the original UNO's 8U2 might work. It should be available from the Arduino site some where. The bootloader would go on the '2560.Either way, you'd need your ISP programmer to put the code on them.
Thanks for the help! So to clarify, I'd need to FIRST load the firmware onto the 8U2. I would then have USB functionality, correct?Yes, you would then have created a USB virtual serial port communications link to and from the PC. Can I then use the 8U2 over USB to load the bootloader AND software onto the 2560?No, the bootloader for the 2560 needs to be installed via a ICSP hardware programmer, which can be another arduino board loaded with the arduino as ICP sketch. The 8U2 chip is not a ICSP programmer, it's just a USB serial converter chip. So whatever you used to install the firmware into the 8U2 chip is what you would use to burn the bootloader into the 2560 chip.What file do I need for the 8U2 firmware and how would I load it with the hardware programmer? I have the Atmel FLIP software if that helps.I've never owned a arduino board with a 8U2 chip so I'm not the one to give you specific steps to take. However the first step is identifying and obtaining the ICSP programmer you are going to use to load the firmware and later the bootloader for the 2560 chip.Lefty
Some programmers can supply power through the ICSP, some can't. So the quick answer is, it depends on the programmer you choose.
Quote from: DirtBiker on Dec 11, 2012, 12:25 amSome programmers can supply power through the ICSP, some can't. So the quick answer is, it depends on the programmer you choose.AVR ISP Mkii
I believe that is one of the programmers that cannot power the target chip
Quote from: monkey123 on Dec 11, 2012, 12:33 amQuote from: DirtBiker on Dec 11, 2012, 12:25 amSome programmers can supply power through the ICSP, some can't. So the quick answer is, it depends on the programmer you choose.AVR ISP MkiiI believe that is one of the programmers that cannot power the target chip, thus external power is need for the target chip.Lefty
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