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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. endrift  🏳️‍⚧️‏ @endrift 27 Mar 2018
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      Hey people who know things about hardware glitching: if I want to fiddle with reset pc control would I want to mess with Vcc in addition to RESET or might RESET alone be sufficient? I have a setup that I could easily throw analog voltage at RESET with, but not Vcc.

      1 reply 0 retweets 4 likes
    2. Hector Martin‏ @marcan42 27 Mar 2018
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      Replying to @endrift

      Depends entirely on the target. Reset glitching and Vcc glitching are different things. One might work where the other one doesn't. With glitching you usually want to have very good timing control, though sometimes all it takes is tapping wires together.

      1 reply 0 retweets 4 likes
    3. endrift  🏳️‍⚧️‏ @endrift 27 Mar 2018
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      Replying to @marcan42

      This would be an AGB-CPU in 5V mode, though I discovered my ADC is 3.3V so it probably won't work too well :/

      1 reply 0 retweets 0 likes
    4. endrift  🏳️‍⚧️‏ @endrift 27 Mar 2018
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      Replying to @endrift @marcan42

      The goal here is to dump the AGB variant of the CGB boot ROM.

      2 replies 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 27 Mar 2018
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      Replying to @endrift

      Usually for reset/clock glitching we're talking about sub-clock-period glitches, digital rather than analog. Analog isn't likely to make it very far into a chip, other than it potentially being converted to a less than clean digital signal.

      1 reply 0 retweets 0 likes
    6. endrift  🏳️‍⚧️‏ @endrift 27 Mar 2018
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      Replying to @marcan42

      Oh I see. Yeah I don't think I have anything that can do that then. Dang :/

      2 replies 0 retweets 0 likes
      Hector Martin‏ @marcan42 27 Mar 2018
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      Replying to @endrift

      We know that at least the CGB CPUs in pre-AGB models used dynamic logic and got really confused by clock screwery though, so maybe just try some good old shorting things out by hand first? Sometimes simple approaches work.

      8:09 PM - 27 Mar 2018
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