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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 13 Jan 2017
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      FUD aside, I'm taking a look at the Intel DCI protocol (JTAG over USB3). Doesn't look very complicated. OpenOCD for Skylake anyone?pic.twitter.com/eXE5n4I00R

      5 replies 24 retweets 72 likes
    2. Hector Martin‏ @marcan42 13 Jan 2017
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      Replying to @alt_kia

      Honestly I was left somewhat confused by the 33c3 talk. There was a bit of a language barrier :/

      1 reply 0 retweets 2 likes
    3. Paweł Lasek‏ @pawel_lasek 13 Jan 2017
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      Replying to @marcan42 @alt_kia

      my understanding is that the cpu has it enabled by default and mobo fw has to disable it.Not every vendor cares :-/

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 14 Jan 2017
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      Replying to @pawel_lasek @alt_kia

      It's a PCH thing, not a CPU thing. I think it's a softstrap. Softstraps aren't publicly documented though.

      2 replies 0 retweets 1 like
    5. Paweł Lasek‏ @pawel_lasek 14 Jan 2017
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      Replying to @marcan42 @alt_kia

      Given that it shows in cpuid, iirc, I thought it was CPU side... well, CPU complex definitely, since xHCI is on-die

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 14 Jan 2017
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      Replying to @pawel_lasek @alt_kia

      Pretty sure xHCI is not on-die. http://images.anandtech.com/doci/9483/Z170%20Platform.jpg …

      2 replies 0 retweets 0 likes
    7. Hector Martin‏ @marcan42 14 Jan 2017
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      Replying to @marcan42 @pawel_lasek @alt_kia

      DCI enable is a strap config in the flash tool (not public but you can find it). Default is off...pic.twitter.com/RDxN70x9km

      1 reply 0 retweets 1 like
    8. Paweł Lasek‏ @pawel_lasek 14 Jan 2017
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      Replying to @marcan42 @alt_kia

      Interesting, first information suggested it was default on... OTOH, having seen some stupid in PC fw, I expect it on :(

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 14 Jan 2017
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      Replying to @pawel_lasek @alt_kia

      I'm sure some OEMs fucked up... but there are >9000 ways OEMs can fuck up security anyway.

      1:54 AM - 14 Jan 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Hector Martin‏ @marcan42 14 Jan 2017
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          Replying to @marcan42 @pawel_lasek @alt_kia

          Also, found the PDF. Still default off.pic.twitter.com/2S7bxOLZjW

          1 reply 0 retweets 1 like
        2. Paweł Lasek‏ @pawel_lasek 14 Jan 2017
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          Replying to @marcan42 @alt_kia

          Makes me feel a tiny bit better, thou still no faith in OEMs. And not sure this could be handled by defensive EFI source

          0 replies 0 retweets 0 likes
          3. End of conversation

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