Re: K6 identifying

Gabriel Paubert (
Wed, 10 Sep 1997 00:52:11 +0200 (METDST)

On Tue, 9 Sep 1997, Juhani Rautiainen wrote:

> It seems that there is a way to check very precise version of K6
> processor but how to implement it seems to be beyond my skills and
> knowledge of x86 internals. AMD K86 BIOS and SW developers Guide
> has section which speaks
> about TAP instructions. IDCODE instruction seems to return value in
> DIR(?) register which contains version code (incremented by AMD
> manufacturing for each revision of silicon), part number and manufacturer.
> Is it possible to probe these values from kernel?

Not really, you're slighltly confused, TAP means test access port. And these
are instructions that go through a serial link on a few pins of the chip
for boundary scan checking and friends... This is pure hardware!