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SubjectRe: [PATCH] intel-x86 model config cleanup
J.A. Magallon wrote:

>Hi all..
>
>One other try.
>
>This is an attempt to clean up the CPU model flags. Changes:
>
>- change names for CONFIG_Mxxxx, trying to make them more intuitive
>- split PII from PPro
>- introduce X86_F00F config flag and fixmap fix.
>- kill CONFIG_M586 as independent flag, and make it just an
> extra flag for 586 (I couldnt get a better name for
> MGEN586, suggestions wellcome...)
>- kill CONFIG_M686 as independent flag, and make it just an
> extra flag for anything >= PPro.
>- change option order definition to avoid duplicates, like:
>
>if [ "$CONFIG_MPENTIUM" = "y" ]; then
> define_bool CONFIG_M586 y <==============
> define_bool CONFIG_X86_TSC y
>fi
>if [ "$CONFIG_MPENTIUMMMX" = "y" ]; then
> define_bool CONFIG_M586 y <==============
> define_bool CONFIG_X86_TSC y
> define_bool CONFIG_X86_GOOD_APIC y
>fi
>if [ "$CONFIG_M586" = "y" ]; then <======== common things here
> define_int CONFIG_X86_L1_CACHE_SHIFT 5
> define_bool CONFIG_X86_USE_STRING_486 y
> define_bool CONFIG_X86_ALIGNMENT_16 y
> define_bool CONFIG_X86_PPRO_FENCE y
> define_bool CONFIG_X86_F00F_BUG y
>fi
>
>Patch follows:
>
>diff -ruN linux-2.4.19-pre9-jam1/Documentation/Configure.help linux-2.4.19-pre9-jam1-arch/Documentation/Configure.help
>--- linux-2.4.19-pre9-jam1/Documentation/Configure.help Wed May 29 11:50:43 2002
>+++ linux-2.4.19-pre9-jam1-arch/Documentation/Configure.help Wed May 29 11:52:18 2002
>@@ -3943,16 +3943,17 @@
> a PPro, but not necessarily on a i486.
>
> Here are the settings recommended for greatest speed:
>- - "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI
>+ - "Generic-386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI
> 486DLC/DLC2, UMC 486SX-S and NexGen Nx586. Only "386" kernels
> will run on a 386 class machine.
>- - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
>+ - "Generic-486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
> SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
>- - "586" for generic Pentium CPUs, possibly lacking the TSC
>+ - "Generic-586" for generic Pentium CPUs, possibly lacking the TSC
> (time stamp counter) register.
>- - "Pentium-Classic" for the Intel Pentium.
>+ - "Pentium" for the Intel Pentium.
> - "Pentium-MMX" for the Intel Pentium MMX.
>- - "Pentium-Pro" for the Intel Pentium Pro/Celeron/Pentium II.
>+ - "Pentium-Pro" for the Intel Pentium Pro.
>+ - "Pentium-II" for the Intel Pentium II / Celeron.
> - "Pentium-III" for the Intel Pentium III
> and Celerons based on the Coppermine core.
> - "Pentium-4" for the Intel Pentium 4.
>
>

Since you are playing in this area, I wonder if you would consider doing
something that has been needed for a while:
Individual CPU selection.

This implies separating the concept of a "generic x86 kernel that
supports N CPU types" from "kernel supports one CPU type and one only."
The i386/config.in is currently a mishmash of both. Dave Jones did
some work along these lines in his "cpuchoice" diff, which I have attached.

Basically, the general direction IMO should be: a user can select the
CPU they own (Pentium-II), and none of the options for Pentium
3/4/Athlon will be enabled. Generic kernels would ask for a minimal CPU
level to support, I imagine. Support >=486, >=586, etc. Pretty much
what we have now.

Jeff





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