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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. new299‏ @new299 2 Jun 2018
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      new299 Retweeted 藤原かもめ

      Memory testhttps://twitter.com/fushi1212/status/1002849375188467714 …

      new299 added,

      0:28
      藤原かもめ @igbtbreaker
      ぁぁぁぁ pic.twitter.com/Dv0iQVUDv9
      1 reply 1 retweet 2 likes
    2. hedge.txt | Mostly Inactive, except when not‏ @hedgeberg 2 Jun 2018
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      Replying to @new299

      Those poor on-chip regulator circuits....

      1 reply 0 retweets 0 likes
    3. Hector Martin‏ @marcan42 2 Jun 2018
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      Replying to @hedgeberg @new299

      SDRAM had on-chip regulators? I'm guessing it's punching straight through the ESD protection diodes and output driver FETs. Probably hitting bit line pins, since it seems to go chip by chip?

      1 reply 0 retweets 2 likes
    4. hedge.txt | Mostly Inactive, except when not‏ @hedgeberg 3 Jun 2018
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      Replying to @marcan42 @new299

      Except it only seems to blow out specific regions and the same regions repeatedly, leaving me to believe it's some kind of on-chip power management at least.

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 3 Jun 2018
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      Replying to @hedgeberg @new299

      Most of RAM is the array; "always the same region" could easily be an entire logic section, like the output drivers or whatever. AFAIK SDRAM just runs at 3.3V single supply and I'm not aware of any internally generated voltages (or even any real power mgmt beyond self-refresh)

      1 reply 0 retweets 0 likes
    6. hedge.txt | Mostly Inactive, except when not‏ @hedgeberg 3 Jun 2018
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      Replying to @marcan42 @new299

      I doubt that heavily. It's rare to see any kind of digital IC of any kind of size without internal power management or stabilization of some kind.

      1 reply 0 retweets 0 likes
    7. hedge.txt | Mostly Inactive, except when not‏ @hedgeberg 3 Jun 2018
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      Replying to @hedgeberg @marcan42 @new299

      Just suspicion tho, odds are I'm totally wrong.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 3 Jun 2018
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      Replying to @hedgeberg @new299

      Remember this is 1993 technology. Lots of stuff had no real power management beyond stopping clocks and the like.

      2:11 AM - 3 Jun 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        1. hedge.txt | Mostly Inactive, except when not‏ @hedgeberg 3 Jun 2018
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          Replying to @marcan42 @new299

          oooh I had failed to notice how old the ram stick is I just assumed it was modern for some reason.

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 3 Jun 2018
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          Replying to @hedgeberg @new299

          I should've specified that by SDRAM I meant the *original* SDR SDRAM. PC100 to be exact. :)

          0 replies 0 retweets 0 likes
          3. End of conversation

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