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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. whitequark‏ @whitequark 26 Mar 2018
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      whitequark Retweeted Hector Martin

      annnd @marcan42 figures it out! it's a PCIe card I had with a Marvell 88SE9230 chip that does some really strange stuffhttps://twitter.com/marcan42/status/978424686995324928 …

      whitequark added,

      Hector Martin @marcan42
      Replying to @marcan42 @whitequark
      Maybe it's this broken Marvell nonsense? https://lists.ubuntu.com/archives/kernel-team/2016-February/072128.html …
      1 reply 0 retweets 14 likes
      Show this thread
    2. whitequark‏ @whitequark 26 Mar 2018
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      this PCIe card, mind you, SATA III 6 Gbps, in theory at least, offers you a way to switch between internal and external SATA ports. jumpers. routing the SATA data lanes around. I bet the signal integrity is 👌pic.twitter.com/aKMbjdlCGM

      3 replies 2 retweets 33 likes
      Show this thread
    3. Hector Martin‏ @marcan42 26 Mar 2018
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      Replying to @whitequark

      Let's just say I've had... not so great experiences with Marvell SATA/SAS controllers. I switched to an LSI SAS2008-based card for good reason. Marvell works... most of the time... if nothing goes wrong. Usually.

      1 reply 0 retweets 1 like
    4. whitequark‏ @whitequark 26 Mar 2018
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      Replying to @marcan42

      yyyyeah I'm probably going to return the SAS controller I bought from newegg without even unpacking it and get an LSI one instead

      1 reply 0 retweets 1 like
    5. Hector Martin‏ @marcan42 26 Mar 2018
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      Replying to @whitequark

      If you're going the LSI route, try to get a basic HBA with IT/IR firmware (or that you know for a fact can be crossflashed from iMR mode). Those usually work best. Avoid Dell PERC. IBM M1015 is usually fine (& cheap and available) but you'll want to crossflash it.

      2 replies 0 retweets 3 likes
    6. Hector Martin‏ @marcan42 26 Mar 2018
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      Replying to @marcan42 @whitequark

      TL;DR LSI sold the same chip with two completely different firmwares, PCI IDs, programming interfaces and drivers - one for full-blown hardware managed RAID (iMR) and one for a simple HBA (IT), optionally with basic RAID0/1 support (IR). You can switch with some effort.

      1 reply 0 retweets 4 likes
    7. whitequark‏ @whitequark 26 Mar 2018
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      Replying to @marcan42

      oh! yeah, I've already learned to avoid hardware RAID like Superfund sites.

      1 reply 0 retweets 5 likes
    8. Hector Martin‏ @marcan42 26 Mar 2018
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      Replying to @whitequark

      Here's my little horror story with a less-than-popular LSI card. These things work great once you get the right firmware on them, but getting there can be tricky depending on the model.https://marcan.st/2016/05/crossflashing-the-fujitsu-d2607/ …

      4 replies 4 retweets 17 likes
    9. whitequark‏ @whitequark 26 Mar 2018
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      Replying to @marcan42

      the... the card has a PowerPC CPU on it? (and MRAM? I didn't even know this is deployed in production) has anyone run Linux on it yet

      2 replies 1 retweet 3 likes
    10. R. Ou‏ @rqou_ 26 Mar 2018
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      Replying to @whitequark @marcan42

      Some "server-grade" Ethernet cards have an embedded CPU like that too (I don't remember if it was Intel, Broadcom, or Mellanox)

      1 reply 0 retweets 2 likes
      Hector Martin‏ @marcan42 26 Mar 2018
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      Replying to @rqou_ @whitequark

      I mean, you can run Linux on a HDD controller, so... Yeah, why not. http://spritesmods.com/?art=hddhack&page=1 …

      7:23 PM - 26 Mar 2018
      • 3 Likes
      • Brendan Dolan-Gavitt R. Ou
      1 reply 0 retweets 3 likes
        1. New conversation
        1. whitequark‏ @whitequark 26 Mar 2018
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          Replying to @marcan42 @rqou_

          yeah, I know that one, but a SAS controller seems more fun. you know why? you could hack it into a 24 Gbps SASternet card if you could control transceivers

          3 replies 0 retweets 5 likes
        2. Hector Martin‏ @marcan42 26 Mar 2018
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          Replying to @whitequark @rqou_

          That... Actually sounds very plausible. I think SAS is symmetric enough it might just work.

          0 replies 0 retweets 0 likes
          3. End of conversation

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