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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.
So apparently many/most smart (i.e. with real firmware) SAS/SCSI/RAID controller cards on the market have a design descended from the 1997 vintage Intel i960 Rx I/O microprocessor. This also lets them switch silicon vendors and keep the driver compatible-ish!
Comparison of register definitions for various SCSI drivers in the Linux kernel (plus i960). I guess I2O is alive and well still. I wonder where the identical upper registers (like the 64-bit queue ports) came from though. They're also the same across various hardware.pic.twitter.com/6nSzJQLuzl
Yeah, makes sense, there's a lot of i960 based RAID/HBA type cards around the place
Most of these are not i960 based. They just seem to have retained the same interface.
I was wondering if it was a similar core component. The CPU, i960 (or i860), is likely to be shared among controllers.
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.
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