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Date: Wed, 06 Aug 2008 08:12:10 -0400 From: Bill Davidsen <davidsen@....com> To: linux-kernel@...r.kernel.org Cc: linux-kernel@...r.kernel.org Subject: Re: What is the best way to identify a new x86 processor that does not implement the CPUID instruction? David Wilson wrote: > I recently bought a Norhtec MicroClient JrSX which uses the Vortex86sx > System on Chip processor (see http://vortex86sx.com/ for more > details). This is identified as a Cyrix 486SLC by the Linux kernel due > to the lack of a CPUID instruction. While this may be seen as a > cosmetic defect, if the kernel can identify the processor correctly it > could, for example, use the clock divisor code provided by the > manufacturer to slow down and speed up the CPU when required. > > The question is: how to differentiate this chip from the Cyrix part? > The freely available "brief data sheet" does not provide much detail. > > I have thought of a couple of schemes but am not really keen on either: > > 1) Clock speed - the SoC runs at 300+ MHz while the Cyrix part is < 100 MHz > 2) Look at the PCI VID/PID for the north bridge as this is part of the CPU die. > > Does anyone have any suggestions? Thanks. Your (2) sounds reasonable. -- Bill Davidsen <davidsen@....com> "We have more to fear from the bungling of the incompetent than from the machinations of the wicked." - from Slashdot -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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