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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. Baoshi‏ @ba0sh1 29 May 2019
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      Bought 5 FTDI Basic clone at $1.1 each. Pretty sure it is using fake FT232RL. Anyway to verify?pic.twitter.com/OlqdqepAV0

      3 replies 0 retweets 1 like
    2. Angus Gratton‏ @projectgus 29 May 2019
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      Replying to @ba0sh1

      Angus Gratton Retweeted Hector Martin

      I think at this price you can just know? Differences are in EEPROM write behaviour and that the bit-bang clocking works correctly on the clone. Don't know of an out of box test except for win drivers. https://mobile.twitter.com/marcan42/status/525194603746426881 … https://mobile.twitter.com/marcan42/status/695292366639378433 … (H/t @marcan42 for all the RE)

      Angus Gratton added,

      Hector Martin @marcan42
      FTDI FT232RL vs. clone, bitbang mode, 38kHz square wave. CH1 is the original, CH2 is the clone. Oh, the irony. pic.twitter.com/QiqLxYfxIi
      1 reply 0 retweets 2 likes
    3. Baoshi‏ @ba0sh1 29 May 2019
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      Replying to @projectgus @marcan42

      I have some FT232 chip purchased way before fake was surfaced. Supposedly I can swap them in. Should be cheaper than I spin a new PCB for this.

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 29 May 2019
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      Replying to @ba0sh1 @projectgus

      Try this: https://marcan.st/transf/ftdi_clone_tool.py … It'll detect clones, and also fix them if they're bricked by windows drivers. At least clones from that time; for all I know they've since fixed the EEPROM behavior to look genuine.

      1 reply 0 retweets 4 likes
    5. Baoshi‏ @ba0sh1 8 Jun 2019
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      Replying to @marcan42 @projectgus

      I received some samples. @marcan42's utility detect them as genuine (or better clone). All units had serial number as 00000000. FT Prog is able to reprogram the chip. Silkscreen shows they are from different batch. Maybe leftovers?pic.twitter.com/K1dhmnJsyM

      1 reply 0 retweets 1 like
    6. Hector Martin‏ @marcan42 8 Jun 2019
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      Replying to @ba0sh1 @projectgus

      Those visually look genuine, though of course it's hard to guarantee. Genuine units, however, ought to ship with real serial numbers AFAIK, so that's a red flag. Could be better clones.

      1 reply 0 retweets 1 like
    7. Baoshi‏ @ba0sh1 8 Jun 2019
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      Replying to @marcan42 @projectgus

      Well the EEPROM content looks like this. I need to replace it with a genuine blank chip to compare.pic.twitter.com/HacF96dr2z

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 8 Jun 2019
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      Replying to @ba0sh1 @projectgus

      it's possible that these were programmed with an all-zero serial (e.g. someone didn't bother with serial generation but still flashed them). The ALYNJEB4 at the end looks like it could be a factory serial (outside the descriptor area)?

      8:31 AM - 8 Jun 2019
      1 reply 0 retweets 0 likes
        1. Baoshi‏ @ba0sh1 8 Jun 2019
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          Replying to @marcan42 @projectgus

          Yes this looks like the factory FTDIChip-ID. I can verify that each board has a different number. It’s probably bit challenging for fake chip to implement it during manufacturing.

          0 replies 0 retweets 0 likes
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