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