Messages in this thread | | | Date | Wed, 28 Oct 2009 09:30:33 +0100 (CET) | From | Jan Engelhardt <> | Subject | RE: [X86] Fix up silly i1586 boot message. |
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On Wednesday 2009-10-28 04:08, Yuhong Bao wrote: > <Pine.LNX.4.55.0805290102340.29522@cliff.in.clinika.pl> > >> Intel started it first with picking up a ridiculous number for the family >> ID for the P4 line. There is no technical justification for not keeping >> these numbers consecutive.
Once one knows that there are 4 bits for the family field, 15 is not such a strange value - it is the last value, one could take it as "reserved, and look elsewhere".
>[...] Intel has assigned family 7 for the original Itanium processor >[...] there was a bug in original NT 4 truncating family IDs >returned by CPUID [...]
That would explain why Intel still shows an oldfashioned family=6 on many contemporary processors (e.g. core i7). BUT, AMD64 processors have family=15 "almost throughout", and so seem to have at least some Intel models. So that tells us that either NT4 works, or nobody uses NT4 on fam15s.
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