Re: Cyrix 6x86MX and Centaur C6 CPUs in 2.1.102

Alan Cox (
Mon, 18 May 1998 09:49:45 +0100 (BST)

> The Cyrix 6x86MX has a fully compatible TSC implementation. However, it
> also allows turning off the CPU when a Halt state is entered, something

No it does not. The intel specification explicility guarantees no time
stamp will be repeated within 10 years under any circumstance. So cyrix
almost has it right

> The mod above also ignores the Centaur C6.

> if ((boot_cpu_data.x86_capability & 16) && (boot_cpu_data.x86_vendor !=
> X86_VENDOR_CYRIX) && (boot_cpu_data.x86_vendor != X86_VENDOR_CENTAUR)) {

This is also slightly wrong. Only step 0 of the centaur C6 has the RDTSC
power bug according to the errata documents. I think it should read
the above + if the CENTAUR case & stepping==0)

That sound right ?


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