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whitequark's profile
whitequark
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@whitequark

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whitequark

@whitequark

http://whitequark.org  · http://llvm.moe  · http://powerlinesinanime.tumblr.com  · working on quantum computers for a living · DMs open · she

Joined July 2010

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    1. whitequark‏ @whitequark Sep 25
      Replying to @eevee @adipisicing

      whitequark Retweeted whitequark

      oh this is an incredible hellscape threadhttps://twitter.com/whitequark/status/1035658186127237123 …

      whitequark added,

      whitequark @whitequark
      so I reverse-engineered the physical layout of the Apple Thunderbolt 3 to Thunderbolt 2 adapter can't seem to read the firmware for some reason; will probably reball the PD uC, solder it back, and snoop the I2C bus during boot pic.twitter.com/siRMqshbK8
      Show this thread
      1 reply 0 retweets 10 likes
    2. whitequark‏ @whitequark Sep 25
      Replying to @whitequark @eevee @adipisicing

      tl;dr USB C and Thunderbolt 3 make PHP look like a simple, elegant design and I mean that literally and yes I made horrible insecure websites with PHP

      1 reply 1 retweet 11 likes
    3. whitequark‏ @whitequark Sep 25
      Replying to @whitequark @eevee @adipisicing

      (it might not be clear but that thread started when i plugged an apple thunderbolt 3 to thunderbolt 2 adapter into an usb c port on my xps13 laptop and expected it to work. i ended up cutting the adapter open, desoldering the controller, figuring out what industry standard chip…

      1 reply 1 retweet 7 likes
    4. whitequark‏ @whitequark Sep 25
      Replying to @whitequark @eevee @adipisicing

      Apple remarked with their own p/n, reverse-engineering the adapter and its test points, dumping and reverse-engineering the adapter firmware, obtaining vendor tools for USB C controllers that are for some reason export-controlled and you can't just download them or the docs,

      1 reply 1 retweet 6 likes
    5. whitequark‏ @whitequark Sep 25
      Replying to @whitequark @eevee @adipisicing

      reflashing the controller, reading the entire USB PD spec, making an USB PD protocol sniffer, dumping the firmware in my laptop, enabling undocumented Intel-only features in vendor tools, figuring out internal Intel politics, and finally pestering at least two Dell people…

      1 reply 1 retweet 6 likes
    6. whitequark‏ @whitequark Sep 25
      Replying to @whitequark @eevee @adipisicing

      including one that is responsible for the USB PD firmware in my specific laptop... ... and I still don't know why the fuck doesn't the goddamn thing just work.)

      2 replies 1 retweet 7 likes
    7.  🎃 🍂 eevee  🍂 🎃‏ @eevee Sep 25
      Replying to @whitequark @adipisicing

      have you considered just using a wall charger

      2 replies 0 retweets 2 likes
    8. whitequark‏ @whitequark Sep 25
      Replying to @eevee @adipisicing

      no no you don't get it USB power delivery is the part of USB that negotiates Thunderbolt, DisplayPort, etc alternate modes over the USB C connector.

      1 reply 1 retweet 5 likes
    9. whitequark‏ @whitequark Sep 25
      Replying to @whitequark @eevee @adipisicing

      Thunderbolt has no relationship with USB power delivery per se, they just had an existing protocol so obviously they stuffed it in there.

      1 reply 0 retweets 3 likes
    10.  🎃 🍂 eevee  🍂 🎃‏ @eevee Sep 25
      Replying to @whitequark @adipisicing

      oh okay of course power delivery would be used for displaypoWHAT ARE YOU SAYING TO ME

      1 reply 2 retweets 4 likes
      whitequark‏ @whitequark Sep 25
      Replying to @eevee @adipisicing

      you can also use it to reflash the three microchips involved in plugging a Thunderbolt 3 device 40 Gbps into your laptop. two in the cable plugs (they have a little elliptic curve engine, and X.509, inside to prove that the cable passed certification) and one more in the device

      8:29 PM - 25 Sep 2018
      • 1 Retweet
      • 6 Likes
      • Marius Gedminas 🎃🍂 eevee 🍂🎃 sww1235 Toxic Megacolon Ryan Castellucci Dr Spooky Haze, DD
      1 reply 1 retweet 6 likes
        1. New conversation
        2. whitequark‏ @whitequark Sep 25
          Replying to @whitequark @eevee @adipisicing

          except they realized that sticking three distinct chips into something like a device with a captive cable is silly so you can virtualize two of them inside of the third. there's an option in the vendor tool and everything

          1 reply 1 retweet 7 likes
        3. whitequark‏ @whitequark Sep 25
          Replying to @whitequark @eevee @adipisicing

          the PD controller in the USB device is called "SOP" in the spec, the one in proximate plug is "SOP-prime" and in the distal plug is "SOP-prime-prime". "SOP" means "start of packet"

          1 reply 1 retweet 7 likes
        4. whitequark‏ @whitequark Sep 25
          Replying to @whitequark @eevee @adipisicing

          i can continue more or less indefinitely

          2 replies 0 retweets 10 likes
        5.  🎃 🍂 eevee  🍂 🎃‏ @eevee Sep 25
          Replying to @whitequark @adipisicing

          help

          0 replies 0 retweets 3 likes
        6. End of conversation

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