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whitequark's profile
whitequark
whitequark
whitequark
@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 @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
    2. 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
    3. 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
    4.  🎃 🍂 eevee  🍂 🎃‏ @eevee Sep 25
      Replying to @whitequark @adipisicing

      have you considered just using a wall charger

      2 replies 0 retweets 2 likes
    5. 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
    6. 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
    7.  🎃 🍂 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
    8. 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

      1 reply 1 retweet 6 likes
    9. 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
    10. 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
      whitequark‏ @whitequark Sep 25
      Replying to @whitequark @eevee @adipisicing

      i can continue more or less indefinitely

      8:34 PM - 25 Sep 2018
      • 10 Likes
      • Thomas Marius Gedminas Dr Spooky Haze, DD 🎃🍂 eevee 🍂🎃 sww1235 𒀯 𒄷 𒄈𒀭𒁇 Toxic Megacolon Tony Naggs Robert Ou
      2 replies 0 retweets 10 likes
        1.  🎃 🍂 eevee  🍂 🎃‏ @eevee Sep 25
          Replying to @whitequark @adipisicing

          help

          0 replies 0 retweets 3 likes
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        1. New conversation
        2. Toxic Megacolon‏ @bizzyunderscore Sep 25
          Replying to @whitequark @eevee @adipisicing

          For any given inexcusable aspect of USB-C, there is at least one Intel engineer on linkedin who is extremely proud of his creation

          1 reply 1 retweet 5 likes
        3. Toxic Megacolon‏ @bizzyunderscore Sep 25
          Replying to @bizzyunderscore @whitequark and

          For any particulay layer of the incredibly baroque signalling, there is a large building's floor worth of people who cost Intel millions to develop it

          0 replies 0 retweets 5 likes
        4. End of conversation

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