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SubjectRe: RFC: [2.6 patch] better i386 CPU selection
On Thu, Sep 11, 2003 at 02:10:43PM +0200, Maciej W. Rozycki wrote:
> 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.

[
My questions might sound silly - I simply don't have the x86
knowledge, but I want to get the dependencies as good as possible.
]

All Cyrix/VIA/IDT/Transmeta processors have a working APIC?

What about the original 386?

Then I can simply change it in my patch to

config X86_GOOD_APIC
bool
depends on !CPU_586TSC
default y

cu
Adrian

--

"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed

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