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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 15 Aug 2018
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      This gets more interesting. Looking through SCSI/SAS controller drivers, I've found *6* that use eerily similar register interfaces. I didn't think they were all the same silicon, so what gives? drivers/scsi/ips.h has the clue. Turns out it's from the Intel i960 Rx.

      3 replies 0 retweets 16 likes
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    2. Grant Taylor‏ @DrScriptt 15 Aug 2018
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      Replying to @marcan42

      I was wondering if it was a similar core component. The CPU, i960 (or i860), is likely to be shared among controllers.

      1 reply 0 retweets 0 likes
    3. Hector Martin‏ @marcan42 15 Aug 2018
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      Replying to @DrScriptt

      It isn't. Most of these cards use ARM or PowerPC CPUs. However, it's possible that they all trace their legacy to i960-based cards, either directly from predecessors, or from people just cloning the same message-passing interface.

      1 reply 0 retweets 1 like
    4. Grant Taylor‏ @DrScriptt 15 Aug 2018
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      Replying to @marcan42

      Didn’t the i860, and possibly the i960, come out before the PowerPC and subsequently ARM CPUs?

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    5. Hector Martin‏ @marcan42 15 Aug 2018
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      Replying to @DrScriptt

      CPU architecture is irrelevant. We're talking about the message-passing hardware of the i960-based I/O accerators from Intel. The point is other vendors copied it in their own silicon. None of this has anything to do with the actual i960 CPU architecture.

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    6. Grant Taylor‏ @DrScriptt 15 Aug 2018
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      Replying to @marcan42

      Okay. I thought the i960 was a CPU not an I/O accelerator. I thought that many RAID cards (and the likes) presented one view to the host while using a CPU to translate to a different set of hardware they saw. Many forming a RAID and presenting a LUN to the host.

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      Hector Martin‏ @marcan42 15 Aug 2018
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      Replying to @DrScriptt

      The *i960 Rx* (which is what I said, not just i960) is an I/O accelerator. https://www.google.com/search?q=i960+rx … And the message passing hardware I just mentioned is exactly what that interface to the host side is.

      8:48 AM - 15 Aug 2018
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        1. Grant Taylor‏ @DrScriptt 15 Aug 2018
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          Replying to @marcan42

          Ah. Sorry. Thank you for the clarification.

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        1. Grant Taylor‏ @DrScriptt 15 Aug 2018
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          Replying to @marcan42

          The i960 Rx I/O Microprocessor looks to be quite a critter. It also included an i960 core. But I guess that doesn’t need to be used for the RAID aspects, just I/O. http://datasheets.chipdb.org/Intel/80960/manuals/27273602.PDF …

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