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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. Cybergibbons‏ @cybergibbons 12 Jun 2018
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      Replying to @securelyfitz

      I want to see you go @dragosr on that connector.

      1 reply 2 retweets 16 likes
    2. SethOps‏ @swordofomen 12 Jun 2018
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      Replying to @cybergibbons @securelyfitz @dragosr

      dammit beat me to it. (btw is that USB C?)

      2 replies 0 retweets 4 likes
    3. dragosr‏ @dragosr 12 Jun 2018
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      Replying to @swordofomen @cybergibbons @securelyfitz

      It does look like that doesn’t it. But I’m connected to the audio jack and Ethernet shield! Oh also, it’s dynamic and changes. But only if a cable is plugged in (USB or HDMI) don’t even need anything at the other end of the cable (!) exercise for reader: read dwc_otg dev notespic.twitter.com/oyyvPeDMOQ

      4 replies 0 retweets 1 like
    4. Hector Martin‏ @marcan42 12 Jun 2018
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      Replying to @dragosr @swordofomen and

      "don’t even need anything at the other end of the cable" Congrats, you've discovered that disconnected cables make a great antenna to pick up EMI from the environment. Now grab a long piece of copper wire, hook it up to your scope probe, and observe the same thing.

      2 replies 0 retweets 21 likes
    5. dragosr‏ @dragosr 12 Jun 2018
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      Replying to @marcan42 @swordofomen and

      Well it’s RF interference @ ~60Hz that looks just like usb and seems to change airgapped Raspi boot when present. Other than that, probably completely boring, so maybe I should ignore it?

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 12 Jun 2018
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      Replying to @dragosr @swordofomen and

      Help, my fingers seem to be infected with #BadBIOS2! The virus is modulating airgap crossing communications using 50Hz ASK! Should I see a doctor??pic.twitter.com/Nh52dFt6xp

      4 replies 10 retweets 45 likes
    7. SethOps‏ @swordofomen 12 Jun 2018
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      Replying to @marcan42 @dragosr and

      Oh snap you have the Thetans!

      1 reply 0 retweets 1 like
    8. dragosr‏ @dragosr 12 Jun 2018
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      Replying to @swordofomen @marcan42 and

      You are so hung up on the ground that you are missing the point about the picked up RF. Pictures on the left are without the signal, floating ground (batt scope), pictures on the right are with signal, same measurement, same device, same cables, same location. Note impulses.pic.twitter.com/78L8yVCofg

      1 reply 0 retweets 0 likes
    9. Hector Martin‏ @marcan42 12 Jun 2018
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      Replying to @dragosr @swordofomen and

      You seem to have issues understanding the concept that a signal that repeats on a 16.66 ms cycle is mains noise. I don't care what it looks like. It's going to look different for different PSUs. It's still mains noise. Protip: your scope isn't going to show you "RF" at 1ms/div.

      2 replies 0 retweets 13 likes
    10. dragosr‏ @dragosr 12 Jun 2018
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      Replying to @marcan42 @swordofomen and

      Are you sure about that?https://youtu.be/dtfu2ZgmV8w 

      3 replies 0 retweets 0 likes
      Hector Martin‏ @marcan42 12 Jun 2018
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      Replying to @dragosr @swordofomen and

      Wow, my phone charger is possessed too. Look at all those glitch pulses! (Or, you know, it's just normal noise from a switching power supply)pic.twitter.com/BwhSCXsJ1M

      11:47 AM - 12 Jun 2018
      • 3 Retweets
      • 18 Likes
      • Syler SethOps meowy catgirl Henning Paul rijk Chartreuse ORBIT32 derpoly Hector Martin
      4 replies 3 retweets 18 likes
        1. maximeborges‏ @maximeborges 12 Jun 2018
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          Replying to @marcan42 @dragosr and

          u_u

          0 replies 0 retweets 0 likes
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        1. dragosr‏ @dragosr 12 Jun 2018
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          Replying to @marcan42 @swordofomen and

          You seem awfully intent on dimissing my hypothesis. Were you part of the dev team or something?

          6 replies 0 retweets 0 likes
        2. Joe Fitz‏ @securelyfitz 12 Jun 2018
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          Replying to @dragosr @marcan42 and

          Ive been quiet on this thread so far, but Dragos, what is the hypothesis? I think Hector and others are showing you the data and procedure (however indirectly) to test your hypothesis.

          3 replies 0 retweets 6 likes
        3. Show replies
        1. meowy catgirl‏ @nyanotech 12 Jun 2018
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          Replying to @marcan42 @dragosr and

          I'm just waiting for you to do something with the oscilloscope hooked up like this imagepic.twitter.com/jNODDxdYwM

          multimeter reading across 2 screws on a light switch wall plate, reading 122V
          0 replies 0 retweets 0 likes
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        1. LSI‏ @lsizq85 12 Jun 2018
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          Replying to @marcan42 @dragosr and

          I prefer analog oscilloscopes, they are faster...

          0 replies 0 retweets 1 like
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