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SubjectRe: RFC: [2.6 patch] better i386 CPU selection
On Thu, 11 Sep 2003, Adrian Bunk wrote:

> - X86_GOOD_APIC: Are there really that many processors with a bad APIC?

Only early revisions of the P54C (75-200MHz) Pentium processors are
affected: steppings B1, B3, B5, C2 and cB1 (or 1, 2, 4, 5 and 11) as
reported by cpuid). MMX Pentia and later chips are OK as well as any
systems using external i82489DX APICs (so far i486, P5 (60/66MHz) Pentium
and P54C Pentium systems with i82489DX APICs has been found, AFAIK). Once
I proposed the option to be user-selectable as an advanced CPU option
(<asm/bugs.h> does appropriate validation), but the proposal was rejected
as incomprehesible to an average user doing a kernel build.

+ Maciej W. Rozycki, Technical University of Gdansk, Poland +
+ e-mail:, PGP key available +

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