Re: cpu misdetection

Alan Cox (alan@lxorguk.ukuu.org.uk)
Tue, 26 May 1998 17:41:29 +0100 (BST)

> Incidentally does anyone know the actual circumstances the
> problem appears in? I've only seen vague posts that there is
> a problem here. You see we only touch ports 0x22 and 0x23 if
> the CPU behaves like a Cyrix in certain circumstances plus

The divide test thinks PPro/PII are a cyrix
The BX chipset has two (and only two) non PCI I/O configuration
registers - at 0x22/0x23

> respond to CPUID). If someone can shed light on what combinations
> of motherboard chipset and CPU have problems it may be possible
> to fix it rather than cripple it.

We already have an algorithm for that - CPUID and only if cpuid fails do
the cyrix test\

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