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Topics - chris_overseas

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Share Your Photos / Son Doong - the world's biggest cave
« on: May 12, 2014, 10:06:09 AM »
I recently had the privilege of going on a week long trip to see the biggest cave in the world, Son Doong Cave in Vietnam. ML was invaluable for photography there - dual ISO, auto ETTR, advanced bracketing, RAW histogram, bulb timer and a bunch of other features all had a heavy workout. Here are some of the results:







More photos here: https://www.facebook.com/media/set/?set=a.10152349406221760.1073741843.658281759&type=1&l=b27f658a62
and here: https://www.facebook.com/media/set/?set=a.10152350850636760.1073741844.658281759&type=1&l=485c9cb5b5

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Reverse Engineering / [DONE] How do I dump 5D3 firmware 1.2.3?
« on: January 05, 2014, 06:18:47 PM »
I would like to try and update ML so it runs with firmware 1.2.3 on the 5D Mark III. My understanding is that I need to do the following:
  • Obtain a ROM dump of the 1.1.3 and 1.2.3 firmwares.
  • Load these dumps into ARMu.exe.
  • For each address is platform/5D3.113/stubs.S, find the equivalent address in the 1.2.3 firmware by comparing the disassemblies.
  • Create a new platform/5D3.123/stubs.S file using these newly discovered addresses.
  • Update various build/compile scripts as required.
I'm new to this however and I've hit a wall at the very first step. How do I get a dump of 1.2.3? I tried updating my 5D3 to 1.2.3 and then flashing 5D3-113-bootflag.fir. Perhaps not surprisingly, this dies with the following error: "Update file error. Please check the memory card and reload the battery and try again". I've also tried to run both the scripts here: http://chdk.wikia.com/wiki/Canon_Basic/Scripts/Dumper but nothing is produced. I'm not convinced the scripts even run. As instructed I set the "SCRIPT" string in the boot sector (using EOScard) and created the appropriate script.req and extend.m files - is there something else I need to do too or does Canon Basic scripting not work on DSLRs, just the point'n'shoots? Can I perhaps extract and decrypt the dump from Canon's 5D300123.FIR file instead? If I need to create my own .fir file for 1.2.3 to dump the ROM, how would I go about doing that - presumably it needs signing? Can I make an autoexec.bin to dump it? Is there another trick I can try?

Obviously various developers here know how to get a ROM dump but I haven't been able to find this process documented in detail anywhere. Any hints would be greatly appreciated!

Appealing to Pelican, coutts, 1%, a1ex, g3gg0, or anyone else who can help me learn more about this.

A couple of relvant threads:
http://www.magiclantern.fm/forum/index.php?topic=2602.msg73403#msg73403
http://www.magiclantern.fm/forum/index.php?topic=5695.msg61657#msg61657

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