linux-kernel - RE: [X86] Fix up silly i1586 boot message.

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Message-ID: <SNT125-W4557277972E36C16091B9EC3B80@phx.gbl>
Date:	Wed, 28 Oct 2009 07:46:54 -0700
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	<jengelh@...ozas.de>
CC:	<macro@...ux-mips.org>, <davej@...hat.com>,
	<linux-kernel@...r.kernel.org>, <mingo@...e.hu>,
	<tglx@...utronix.de>, <hpa@...or.com>
Subject: RE: [X86] Fix up silly i1586 boot message.


 <alpine.LSU.2.00.0910280914590.28170@...t.zrqbmnf.qr>
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> On Wednesday 2009-10-28 04:08=2C Yuhong Bao wrote:
>>=20
>>
>>> Intel started it first with picking up a ridiculous number for the fami=
ly
>>> 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=2C 15 is not
> such a strange value - it is the last value=2C one could take it as
> "reserved=2C and look elsewhere".
Indeed=2C as I said=2C AMD began to use the extended family field with the =
K10.
>>[...] 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=3D6 on
> many contemporary processors (e.g. core i7). BUT=2C AMD64 processors
> have family=3D15 "almost throughout"=2C and so seem to have at least some
> Intel models.=A0See my second mailing post message for why.
> So that tells us that either NT4 works=2C or nobody uses
> NT4 on fam15s.Family 15 truncated to 3 bits is family 7=2C which do work =
with NT 4=2C while family 8 truncated to 3 bits is family 0.
Yuhong bao 		 	   		 =20
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