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CONFIG_M486: 486

General informations

The Linux kernel configuration item CONFIG_M486 has multiple definitions:

486 found in arch/i386/Kconfig.cpu

The configuration item CONFIG_M486:

Help text

Select this for a 486 series processor, either Intel or one of the compatible processors from AMD, Cyrix, IBM, or Intel. Includes DX, DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.

486 found in arch/i386/Kconfig

The configuration item CONFIG_M486:

Help text

Select this for a 486 series processor, either Intel or one of the compatible processors from AMD, Cyrix, IBM, or Intel. Includes DX, DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.

486 found in arch/x86/Kconfig.cpu

The configuration item CONFIG_M486:

Help text

This is the processor type of your CPU. This information is used for optimizing purposes. In order to compile a kernel that can run on all supported x86 CPU types (albeit not optimally fast), you can specify "486" here.

Note that the 386 is no longer supported, this includes AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2, UMC 486SX-S and the NexGen Nx586.

The kernel will not necessarily run on earlier architectures than the one you have chosen, e.g. a Pentium optimized kernel will run on a PPro, but not necessarily on a i486.

Here are the settings recommended for greatest speed: - "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 lacking the TSC (time stamp counter) register. - "Pentium-Classic" for the Intel Pentium. - "Pentium-MMX" for the Intel Pentium MMX. - "Pentium-Pro" for the Intel Pentium Pro. - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron. - "Pentium-III" for the Intel Pentium III or Coppermine Celeron. - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron. - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D). - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird). - "Crusoe" for the Transmeta Crusoe series. - "Efficeon" for the Transmeta Efficeon series. - "Winchip-C6" for original IDT Winchip. - "Winchip-2" for IDT Winchips with 3dNow! capabilities. - "GeodeGX1" for Geode GX1 (Cyrix MediaGX). - "Geode GX/LX" For AMD Geode GX and LX processors. - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3. - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above). - "VIA C7" for VIA C7.

If you don't know what to do, choose "486".

Hardware

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