Disassembling an AVR HEX file (anyone got a full version of IDA?)

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Peter "Sci" Turpin

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Mar 22, 2014, 9:30:58 PM3/22/14
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I've got a couple of HEX files that I got from the brain of a toy robot
(flash and EEPROM). The Brain is an Atmel ATmega8L.

I'd like to disassemble it so I have an idea how it communicates with
the black-blob IC that likely contains the movement & sound data.

If anyone's got a full version of IDA, it sounds like turning it into
assembler should be simple. AtmelStudio won't seem to do it (at least
not when running without a physical programmer).

Mark Steward

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Mar 23, 2014, 7:42:20 AM3/23/14
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What's wrong with avr-gcc? it comes with Arduino software, and will be packaged for your *nix system of choice.

avr-objdump -d
avr-as -mmcu=atmega8


Mark




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Adrian Godwin

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Mar 23, 2014, 7:55:23 AM3/23/14
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Putting a scope or logic analyser on the lines into the black blob will probably give you a faster idea, though you may end up having to disassemble the code to determine the meaning of what you read.


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Peter "Sci" Turpin

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Mar 23, 2014, 11:22:37 AM3/23/14
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Because I currently don't have a functioning *nix system.
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Yvan Janssens

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Mar 23, 2014, 11:24:45 AM3/23/14
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I should've sent you a reply off list. 

Kind regards,

Yvan Janssens

Sent from my PDA - excuse me for my brevity
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Peter "Sci" Turpin

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Mar 23, 2014, 11:29:19 AM3/23/14
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To clarify, I'm not asking for a pirated copy of the software, I'm
asking if there's someone I could email the files to who could email me
back the resultant disassembled info.

Mark Steward

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Mar 23, 2014, 11:40:20 AM3/23/14
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Email me the files - I can disassemble them for you.


Mark


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Mark Steward

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Mar 23, 2014, 11:41:36 AM3/23/14
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As I said, these files come with the Arduino software, available here for everything except DOS:

  http://arduino.cc/en/Main/Software#toc1

I also stumbled across this today, which looks promising:


Mark


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Peter "Sci" Turpin

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Mar 23, 2014, 1:08:08 PM3/23/14
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> I also stumbled across this today, which looks promising:
>
> http://www.onlinedisassembler.com/odaweb/

I tried that last night. It kept resetting to i386 in Chrome and failed
to update correctly in FireFox. Shame, rather a good idea.

> Mark
>
>
> On Sun, Mar 23, 2014 at 3:22 PM, Peter "Sci" Turpin <s...@sci-fi-fox.com
> <mailto:s...@sci-fi-fox.com>> wrote:
>
> Because I currently don't have a functioning *nix system.
>
>
> On 23/03/2014 11:42, Mark Steward wrote:
>
> What's wrong with avr-gcc? it comes with Arduino software, and
> will be
> packaged for your *nix system of choice.
>
> avr-objdump -d
> avr-as -mmcu=atmega8
>
>
> Mark
>
>
> On Sun, Mar 23, 2014 at 1:30 AM, Peter "Sci" Turpin
> <s...@sci-fi-fox.com <mailto:s...@sci-fi-fox.com>
> <mailto:s...@sci-fi-fox.com <mailto:s...@sci-fi-fox.com>>> wrote:
>
> I've got a couple of HEX files that I got from the brain of
> a toy
> robot (flash and EEPROM). The Brain is an Atmel ATmega8L.
>
> I'd like to disassemble it so I have an idea how it
> communicates
> with the black-blob IC that likely contains the movement &
> sound data.
>
> If anyone's got a full version of IDA, it sounds like
> turning it
> into assembler should be simple. AtmelStudio won't seem to
> do it (at
> least not when running without a physical programmer).
>
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Peter "Sci" Turpin

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Mar 23, 2014, 1:10:01 PM3/23/14
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Emailed, thankyou very much!
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Martin Ellis

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Mar 23, 2014, 2:50:56 PM3/23/14
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Radare supports avr apparently, it's a very capable (if sometimes buggy) disassembler.

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