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    SubjectRe: 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 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 <>
    "We have more to fear from the bungling of the incompetent than from
    the machinations of the wicked." - from Slashdot

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