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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. whitequark‏ @whitequark 3 Sep 2019
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      the USB4 spec just dropped. I thought it would include TBT3 by reference, but no, they took great care to explain the absolute minimum possible of TBT3, just saying that unspecified "compatibility" is providedpic.twitter.com/FhTOQRw9fl

      6 replies 39 retweets 116 likes
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    2. whitequark‏ @whitequark 3 Sep 2019
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      USB4 itself includes another PCIe encapsulation (unrelated to TBT) that on the first glance looks (a) reasonable and (b) straightforward to implement, which is good I am also glad to see that ACS is mandatorypic.twitter.com/6lPFf5vHDV

      3 replies 4 retweets 56 likes
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    3. whitequark‏ @whitequark 3 Sep 2019
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      overall, the USB4 architecture is unsurprising so far, as it's exactly what I expected to see looking at recent patents several months ago; it's now a very generic transport layer interface with pluggable protocols (USB 3, DP, PCIe defined so far, probably more to come)pic.twitter.com/4iNFoySMgw

      2 replies 7 retweets 39 likes
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    4. whitequark‏ @whitequark 3 Sep 2019
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      like TBT3, USB4 relies on a complex MPLS-like routing scheme where the host controller explicitly directs the packets down a particular path. the driver support for this for TBT3 is abysmal (hardcoded paths...), but maybe that will change for USB4pic.twitter.com/OdjGemcw9g

      3 replies 4 retweets 30 likes
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    5. whitequark‏ @whitequark 3 Sep 2019
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      I have absolutely no idea how a stack of this complexity and with this amount of backward compatibility requirements is going to work reliably with the very variable PC platform, but hey, let's be optimistic for now

      3 replies 6 retweets 37 likes
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    6. whitequark‏ @whitequark 3 Sep 2019
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      oh and one last thing. USB 2 and USB 3 were already completely separate by the time USB 3 came out, but the USB 3 spec still had some pretense they're related. USB4 drops that; there is 1 (one) normative sentence mentioning USB 2 that I can see in the entire spec

      3 replies 1 retweet 27 likes
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      Hector Martin‏ @marcan42 3 Sep 2019
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      Replying to @whitequark

      At least USB3 and USB2 and USB1 had the same data/programming model (with increasing extensions). USB4 is finally something new-ish.

      7:50 PM - 3 Sep 2019
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      • sww1235 whitequark FIPSmode Squad
      0 replies 0 retweets 3 likes

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