lkml.org 
[lkml]   [2008]   [Aug]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    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 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@tmr.com>
    "We have more to fear from the bungling of the incompetent than from
    the machinations of the wicked." - from Slashdot


    \
     
     \ /
      Last update: 2008-08-06 14:05    [W:0.022 / U:182.124 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site