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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Rich Felker‏ @RichFelker Aug 22
      Replying to @alt_kia @whitequark

      Wow. Why wouldn't you just dump the firmware, nop out the limiter code, and reflash?

      2 replies 0 retweets 7 likes
    2. Kia‏☆‏ @alt_kia Aug 22
      Replying to @RichFelker @whitequark

      because those ECUs startlingly often use pathologically arcane and proprietary microcontroller architectures.

      1 reply 0 retweets 24 likes
    3. Robert Ou‏ @rqou_ Aug 22
      Replying to @alt_kia @RichFelker @whitequark

      I thought most of them nowadays are ARM or SH?

      1 reply 0 retweets 1 like
    4. Rich Felker‏ @RichFelker Aug 22
      Replying to @rqou_ @alt_kia @whitequark

      I'm guessing from context it was really old, not nowadays. But for an old Toyota my guess would be SH-1 or SH-2.

      1 reply 0 retweets 3 likes
    5. Kia‏☆‏ @alt_kia Aug 22
      Replying to @RichFelker @rqou_ @whitequark

      do you know how they do redundancy? I know in aerospace they sometimes have a primary channel and a monitor/standby channel that does the same computations and then some stuff for switching in case of failure, but idk how they do that in automotive ECUs

      3 replies 0 retweets 3 likes
    6. Rich Felker‏ @RichFelker Aug 22
      Replying to @alt_kia @rqou_ @whitequark

      On vehicles from before the late 90s (maybe even later than that) I doubt they have any redundancy. The ECU just isn't that important. If it fails, at worst the engine stalls. It's not like modern drive-by-wire or Tesla's brilliant brake-by-wire mess.

      1 reply 0 retweets 4 likes
    7. Kia‏☆‏ @alt_kia Aug 22
      Replying to @RichFelker @rqou_ @whitequark

      i guess if the throttle is controlled by a traditional Bowden cable it's not that bad (unless there's a cruise-control bowden cable as well, since the throttle opening will be max(gas pedal, cruise-control command)).

      1 reply 0 retweets 3 likes
    8. Kia‏☆‏ @alt_kia Aug 22
      Replying to @alt_kia @RichFelker and

      (I have throttle-by-wire and it’s super endearing—when you turn the key to the “run” position when the car was off and the pedal is pushed down all the way, you can hear the sound of the throttle instantly moving to the wide-open position!)

      1 reply 0 retweets 6 likes
    9. Rich Felker‏ @RichFelker Aug 23
      Replying to @alt_kia @rqou_ @whitequark

      Now I'm actually curious how *real* fail-safe accelerator pedal would be designed in a pure electric vehicle. Probably should be some kind of resistor/fuse array routed by pedal position inline with current to the motor(s).

      1 reply 0 retweets 0 likes
    10. Alexander Riccio‏ @ariccio Aug 23
      Replying to @RichFelker @alt_kia and

      See also: https://betterembsw.blogspot.com/2014/09/a-case-study-of-toyota-unintended.html … (The streaming video is best)

      1 reply 0 retweets 1 like
      Rich Felker‏ @RichFelker Aug 23
      Replying to @ariccio @alt_kia and

      Pretty sure they didn't have a real fail-safe... 😂

      8:46 PM - 23 Aug 2018
      • 1 Like
      • Alexander Riccio
      1 reply 0 retweets 1 like
        1. Alexander Riccio‏ @ariccio Aug 24
          Replying to @RichFelker @alt_kia and

          Soooo, supposedly, the closest thing to a failsafe was that if you held down the start button for 3+ seconds it would kill the engine. That's not a fail safe, but it was an out.

          0 replies 0 retweets 2 likes
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