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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. Hector Martin‏ @marcan42 9 Aug 2016
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      Messing with the new MediaTek MT7687 chips (WiFi + Cortex-M4). Step one: rewrite the horrible Windows-only flasher.https://github.com/marcan/mt7687flash …

      1 reply 16 retweets 42 likes
    2. Sean Cross‏ @xobs 9 Aug 2016
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      Replying to @marcan42

      python makes it look so much cleaner than my C-based one for the 6260.

      1 reply 0 retweets 0 likes
    3. Hector Martin‏ @marcan42 9 Aug 2016
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      Replying to @xobs

      Was it the same/similar protocol?

      1 reply 0 retweets 0 likes
    4. Sean Cross‏ @xobs 9 Aug 2016
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      Replying to @marcan42

      roughly. They are all basically the same. You can ID the chip easily enough, at least.https://github.com/xobs/fernly/blob/master/fernly-usb-loader.c …

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 9 Aug 2016
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      Replying to @xobs

      Looks pretty different actually, totally different command/response formats AFAICT, and this one uses XMODEM for the actual data.

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 9 Aug 2016
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      Replying to @marcan42 @xobs

      Basically, on these, the bootrom just takes a raw blob via XMODEM, dumps it into SRAM, and jumps to it. Rest is in their flasher blob.

      1 reply 0 retweets 0 likes
    7. Hector Martin‏ @marcan42 9 Aug 2016
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      Replying to @marcan42 @xobs

      You can actually vanilla XMODEM the app bootloader (the stuff at 0 in flash) into the bootrom in recovery mode and it'll just run it.

      3 replies 0 retweets 0 likes
    8. Sean Cross‏ @xobs 9 Aug 2016
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      Replying to @marcan42

      I was reading the command() function, which does seem similar. But I guess that's communicating with what's already uploaded?

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 9 Aug 2016
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      Replying to @xobs

      Yup, that just talks to the "ATED" which is the flasher runtime that gets uploaded. The bootrom only speaks XMODEM.

      2:22 AM - 9 Aug 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Hector Martin‏ @marcan42 9 Aug 2016
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          Replying to @marcan42 @xobs

          Of course I could write my own runtime but no point in wasting time on that first, I want to ditch their SDK and port ChibiOS :)

          1 reply 0 retweets 0 likes
        2. Sean Cross‏ @xobs 9 Aug 2016
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          Replying to @marcan42

          I like that goal.

          0 replies 0 retweets 0 likes
          3. End of conversation

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