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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 27 Jan 2018
      • Report Tweet
      • Report NetzDG Violation

      I looked at microcode_amd_fam17h.bin (supposed microcode fix for Spectre) and it *only* applies to fam17h model 1 stepping *2*. Which as far as I can tell is EPYC. My Threadripper is stepping *1* and is *NOT* updated by this microcode. So consumer CPUs are NOT fixed yet.

      4 replies 23 retweets 37 likes
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    2. Hector Martin‏ @marcan42 27 Jan 2018
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      • Report NetzDG Violation

      If anyone has a Stepping 2 retail CPU I'd like to hear about it, but as far as I can tell from some google-sleuthing, that's EPYC. Signature is 0x80f12 (the 12 means model 1 stepping 2), updated ucode version is 0x08001213. My TR is still on 0x08001129 and has sig 0x80f11.

      2 replies 2 retweets 9 likes
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    3. Hector Martin‏ @marcan42 27 Jan 2018
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      Yeah, I tried hacking the equivalence table to force it to try to load, and it fails. It's not just a signature omission; that microcode does NOT apply to my CPU.

      1 reply 0 retweets 1 like
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      Hector Martin‏ @marcan42 27 Jan 2018
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      It's possible that AMD cooked up a new stepping in time for the EPYC release and they just released the microcode for it only for enterprise customers, which would be guaranteed to have stepping 2. So maybe retail chips of that stepping exist, but most would be 1, SOL for now.

      12:59 AM - 27 Jan 2018
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      • Patrik Ragnarsson Graham Sutherland (Polynomial^DSS) Tony Naggs
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