Documentation/cpu-freq/cpufreq-nforce2.txt

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   2 The cpufreq-nforce2 driver changes the FSB on nVidia nForce2 plattforms.
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   4 This works better than on other plattforms, because the FSB of the CPU
   5 can be controlled independently from the PCI/AGP clock.
   6
   7 The module has two options:
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   9         fid:     multiplier * 10 (for example 8.5 = 85)
  10         min_fsb: minimum FSB
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  12 If not set, fid is calculated from the current CPU speed and the FSB.
  13 min_fsb defaults to FSB at boot time - 50 MHz.
  14
  15 IMPORTANT: The available range is limited downwards!
  16            Also the minimum available FSB can differ, for systems
  17            booting with 200 MHz, 150 should always work.
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  19