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Different Firmware

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Offline Materdaddy

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Different Firmware
« on: 13 / August / 2009, 15:44:19 »
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I am new to CHDK and have dumped the firmware on my A1000IS using udumper.  I compared it to one available with one I found on the CHDK wiki and they are different.

Is this normal?  The firmware version number is the exact same 1.00b  I'm not sure if the build date is the same, because that wasn't posted by the person who posted their firmware on the wiki.

The differences appear to be minor from looking at output of things like strings.  The one posted on the wiki contains a name, presumably a developer from Canon who built the firmware, which was re-built later without that, and shipped on new cameras.

My questions are:
  • Has anybody noticed something similar before?
  • Does this matter to the rest of the porting process?  I was wanting to pick off where diablo left off in this thread.
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Offline fe50

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Re: Different Firmware
« Reply #1 on: 14 / August / 2009, 02:13:48 »
Hello & welcome, Materdaddy !
Quote from: Materdaddy on 13 / August / 2009, 15:44:19
I am new to CHDK and have dumped the firmware on my A1000IS using udumper.  I compared it to one available with one I found on the CHDK wiki and they are different.
Is this normal?  The firmware version number is the exact same 1.00b  I'm not sure if the build date is the same, because that wasn't posted by the person who posted their firmware on the wiki.

The differences appear to be minor from looking at output of things like strings.  The one posted on the wiki contains a name, presumably a developer from Canon who built the firmware, which was re-built later without that, and shipped on new cameras.

My questions are:
  • Has anybody noticed something similar before?
  • Does this matter to the rest of the porting process?  I was wanting to pick off where diablo left off in this thread.
Some parameters (also things like the "owner name" you can set via the Canon firmware  ;) ) are saved on internal flash, just like the firmware, and so there will be differences at the end of the dump - so yes, absolutely normal...
Does this matter ? - No, not if the code is the same; to be sure you can compare the dissassembly, but since the fw version is the same (1.00b), there's no need to do this...
For porting CHDK those (data)differences are not relevant, you can ignore them.
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Offline Materdaddy

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Re: Different Firmware
« Reply #2 on: 14 / August / 2009, 13:57:49 »
That's good to know.  Thanks for the information.  I guess if it was mine with the name (and therefore My name) I might have figured it out.

The rest of the dump looked the same when comparing the strings and disassembly, I just wanted to make sure I wasn't missing something.
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