I wonder what benefit there is to Intel of trying to keep this sort of thing secret? It seems to me that a processor vendor maximizes the value of their product to customers by revealing what's inside, even if they also state that some things aren't officially supported.
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Hasn't this already been resolved through firmware updates?
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It's not a bug, it's an obscured feature (unbelievable for ordinary reserchers)
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Any Intel employee knows that exists in any IC out there. How would you otherwise debug during post-silicon? The bug of course might be someone forgot to burn the right fuse to disable that in production hardware :)
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Now, not only Intel employees are knowing that ))
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Back in the mid-90's, there were BILBO (Built-In Logic Block Observation) circuits on-chip, with internal buffers accessible through JTAG. Intel x86 and Sun/TI SPARC CPUs at least. Very likely others too.
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It makes total sense to me. One wouldn’t be able to debug an OoO without this, and it makes sense that very close customers would have access to this functionality. Curious that this information is now public. Would be neat to have this for an Open Source core like
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Amazing
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