Re: [RFC PATCH 00/15] Prepare for new Intel family models

[Andrew Cooper]

> ---Noteworthy quirks---
> Pentium II Overdrive - A unique family number:
>   Wikipedia says[2], In Intel's "Family/Model/Stepping" scheme, the Pentium II
>   OverDrive CPU identifies itself as family 6, model 3, though this is 
>   misleading, as it is not based on the family 6/model 3 Klamath core. As 
>   mentioned in the Pentium II Processor update documentation from Intel, 
>   "although this processor has a CPUID of 163xh, it uses a Pentium II processor 
>   CPUID 065xh processor core."
>
>   A dump of the microcode file 06-03-02 shows:
>     001/001: sig 0x00001632, pf_mask 0x00, 1998-06-10, rev 0x0002, size 2048
>   An archived CPUID dump [3] also says:
>     CPUID 00000001: 00001632-00000000-00000000-0183FBFF
>
>   That would translate to a family number of 22 (0x16). This aberration is 
>   not explicitly handled anywhere in the kernel so the platform might already 
>   be broken. This series might make it worse for the platform if the latest 
>   kernel works on it by chance.

Are you sure?  Bits 13:12 are the type field, and the 0x1 you've got is
for an OverDrive processor.

x86_family() will consider this to be family 6 as far as I can see.

~Andrew