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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 6 May 2020
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      People love to get all excited about leaks of official SDKs or code... but really, rarely are they all that amazing. Early on in development of homebrew for a console, they can help make things move much faster, but at the expense of legally tainting everything they touch.

      3 replies 25 retweets 144 likes
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    2. Hector Martin‏ @marcan42 6 May 2020
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      This late in the game, though? Some of my reverse engineered documentation is *more accurate* than the official docs. Because I document what the hardware *does*, not what they *intended* it to do.

      2 replies 24 retweets 147 likes
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    3. Hector Martin‏ @marcan42 6 May 2020
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      So for example, the leaked docs talk about registers existing in certain memory windows, but don't document all the mirrors that I discovered back when I did an exhaustive analysis of the Starlet 32-bit address space.

      1 reply 3 retweets 54 likes
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      Hector Martin‏ @marcan42 6 May 2020
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      Now, certainly, leaks like this do clarify a lot of the long tail of things. "Oooh, so *that's* what that register did!". But those things we didn't know are largely because they weren't important. If they were, we would have figured them out.

      11:32 PM - 6 May 2020
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      • Margen67 Retro Dario Gaming Aidiin Fenrir 📡the Listening Post?🌌 GuardianKitsune Lost Heidi Scott Zachary Mayank 🧢✌️🌼≥☂️ Daniel Black Elfdemon
      1 reply 4 retweets 46 likes
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        2. Hector Martin‏ @marcan42 6 May 2020
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          And it's always fun to see the official names for things. Remember the STM release exploit? That bug is in the leaked code. The real code has the same structure as my decompiled version, and the bug is exactly what I thought (missing return statement), but the names differ.

          1 reply 2 retweets 41 likes
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        3. Hector Martin‏ @marcan42 6 May 2020
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          And yes, the RSA sigcheck really was a strncmp call. But anyway, what is actually useful in a leak like this? Not much, really. Nevermind that you can't legally use any of it, it's not really adding much practical information.

          2 replies 2 retweets 35 likes
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        4. Hector Martin‏ @marcan42 6 May 2020
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          The only thing that comes to mind is that having the PLL register documentation (which is always one of the most nigh impossible things to reverse engineer black box) might allow someone to try to overclock a Wii. Maybe. Not sure if it's possible.

          2 replies 2 retweets 42 likes
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        5. Hector Martin‏ @marcan42 6 May 2020
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          Really, these leaks are mostly just fun because you get to *see* what they were thinking, and also things that got dropped. Did you know that the Wii was supposed to support using Wiimotes with GameCube software? There is supposedly a hardware SI emulator in the Hollywood.

          1 reply 6 retweets 64 likes
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        6. Hector Martin‏ @marcan42 6 May 2020
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          Apparently BroadOn planned to do this... by sticking the entire USB and Bluetooth stacks in Starlet SRAM. Gee, I can't imagine how that didn't work out... Though if you tried hard enough and cut a lot of corners, *maybe* you could squeeze something in. Anyone want to try?

          1 reply 2 retweets 37 likes
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        7. Hector Martin‏ @marcan42 6 May 2020
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          But Devolution already does this in a more flexible way anyway... So again, we're past that. So while I certainly find it *interesting* to read a full Hollywood ACR register documentation, it isn't going to lead to any breakthroughs.

          2 replies 4 retweets 37 likes
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        8. Hector Martin‏ @marcan42 6 May 2020
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          Now if the leak *really* contained full Verilog for the GPU, for example, that could help resolve long tail emulation mysteries... But no sane emulator developer is going to want to taint their project like that. But it doesn't, so this is a moot point.

          3 replies 2 retweets 54 likes
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        9. End of conversation

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