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Restore 8U2 bootloader on Arduino Megga board
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Alan Marconett  
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 More options Jul 30 2012, 5:51 pm
From: "Alan Marconett" <KM...@sbcglobal.net>
Date: Mon, 30 Jul 2012 14:51:28 -0700
Local: Mon, Jul 30 2012 5:51 pm
Subject: Restore 8U2 bootloader on Arduino Megga board
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Has anyone restored (re-flashed) the Atmel 8U2 on the Arduino Mega2560
board?

Alan  KM6VV


 
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Austin Hendrix  
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 More options Jul 31 2012, 12:09 pm
From: Austin Hendrix <legot...@aol.com>
Date: Tue, 31 Jul 2012 09:09:51 -0700
Local: Tues, Jul 31 2012 12:09 pm
Subject: Re: [HBRobotics] Restore 8U2 bootloader on Arduino Megga board
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I haven't needed to flash the 8u2 on my Mega2560 board, but it should be
possible if you have an ISP.

Be careful with your terminology; "bootloader" usually refers to the
software on the Atmega2560 that allows loading firmware over the serial
line, while the 8u2 is the USB to serial conversion chip. Which one are
you talking about?

-Austin

On 07/30/2012 02:51 PM, Alan Marconett wrote:


 
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Alan Marconett  
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 More options Jul 31 2012, 1:24 pm
From: "Alan Marconett" <KM...@sbcglobal.net>
Date: Tue, 31 Jul 2012 10:24:45 -0700
Local: Tues, Jul 31 2012 1:24 pm
Subject: RE: [HBRobotics] Restore 8U2 bootloader on Arduino Megga board
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Yeah, I'm getting confused myself!  I have an STK500, and I can program the
bootloader/program space on the 2560.  In addition to the clearly marked ISP
header for the 2560, there is also an ISP header for the 8U2 (don't ask)
which is how I got into trouble!  My 8U2 no longer looks like a USB, and I
haven't been successful trying to run flip (flip's a flop).  My STK500 and
Atmel Studio 4 apparently can't program the 8U2.  I loaded Atmel Studio 6.0
onto another computer, and while it does recognize the 8U2, it wants a USB
STK500 as far as I can tell (haven't tried to learn all of it).  Flip does
not like the "combined" 8U2 hex (looks more like html) file I've found on:

https://github.com/arduino/Arduino/tree/master/hardware/arduino/firmw...

And since the code on the 8U2 is bricked, I doubt if flip could load it
anyway.

My sad story.

Alan KM6VV

>On Behalf Of Austin Hendrix

>I haven't needed to flash the 8u2 on my Mega2560 board, but it should be

possible if you have an ISP.

>Be careful with your terminology; "bootloader" usually refers to the

software on the Atmega2560 that allows loading firmware >over the serial
line, while the 8u2 is the USB to serial conversion chip. Which one are you
talking about?

>-Austin

On 07/30/2012 02:51 PM, Alan Marconett wrote:

> Has anyone restored (re-flashed) the Atmel 8U2 on the Arduino Mega2560
> board?

> Alan  KM6VV

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Austin Hendrix  
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 More options Jul 31 2012, 1:38 pm
From: Austin Hendrix <legot...@aol.com>
Date: Tue, 31 Jul 2012 10:38:12 -0700
Local: Tues, Jul 31 2012 1:38 pm
Subject: Re: [HBRobotics] Restore 8U2 bootloader on Arduino Megga board
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I would try to use avrdude to load the firmware with your ISP
programmer, as suggested on the firmware page you linked.

You may have to change the programmer option; try -c stk500 instead of
-c avrispmkii

-Austin

On 07/31/2012 10:24 AM, Alan Marconett wrote:


 
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Alan Marconett  
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 More options Jul 31 2012, 2:06 pm
From: "Alan Marconett" <KM...@sbcglobal.net>
Date: Tue, 31 Jul 2012 11:06:23 -0700
Local: Tues, Jul 31 2012 2:06 pm
Subject: RE: [HBRobotics] Restore 8U2 bootloader on Arduino Megga board
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I can look up avrdude and try that.  I thought it was hardware?

I did find under tools in Atmel Studio 6 a "load STK500" option, so that
might get there.  

Still not clear on the hex file, I did drill a little deeper on the
downloads and found a hex file.

Thanks!

Alan


 
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