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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 16 Sep 2019
      • Report Tweet
      • Report NetzDG Violation

      From the "how the fuck did this hardware bug happen" department: Sandy Bridge GPUs cannot access the low 1MB of RAM, plus five pages. The pages at 0x20050000, 0x20110000, 0x20130000, 0x20138000, 0x40004000. Specifically.pic.twitter.com/rMN20Lt3xX

      11 replies 152 retweets 509 likes
      Show this thread
    2. q3k‏ @q3k 16 Sep 2019
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      Replying to @marcan42

      *tinfoil hat* These almost look like magic values, maybe some production debug/verification ranges with special decoder behaviour? 2005, 2011, 2013, 2013(.5) all look like years. 40004000 is too pretty to be accidental.

      1 reply 1 retweet 24 likes
    3. Hector Martin‏ @marcan42 16 Sep 2019
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      Replying to @q3k

      20000000-201fffff and 40004000-40004fff are "used by 'pnp 00:08'" on my system, which is either related to the culprit, or a BIOS workaround (Ivy Bridge here). Trying to find out what pnp 00:08 is.

      1 reply 0 retweets 15 likes
    4. q3k‏ @q3k 16 Sep 2019
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      Replying to @marcan42

      Not there on Skylake or Nehalem, so sounds like you're on the right track.

      1 reply 0 retweets 6 likes
      Hector Martin‏ @marcan42 16 Sep 2019
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      Replying to @q3k

      Looks like a BIOS workaround to just reserve the RAM. Also, under some conditions, apparently the ranges need to be broader?pic.twitter.com/EQdXLghWg8

      12:15 PM - 16 Sep 2019
      • 9 Likes
      • Professor Valerian H🌻 #COLA4all #BlackLivesMatter 🐊 Chloride Cull 🏳️‍🌈 Nox Ludicro Maximilian Marx JuAnZiLLa alex hell writes memory initialization code for fun Rusty W 595, BSc 󾓪 whitequark
      0 replies 0 retweets 9 likes

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