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Diffstat (limited to 'Documentation/cpu-freq/amd-powernow.txt')
-rw-r--r-- | Documentation/cpu-freq/amd-powernow.txt | 38 |
1 files changed, 0 insertions, 38 deletions
diff --git a/Documentation/cpu-freq/amd-powernow.txt b/Documentation/cpu-freq/amd-powernow.txt deleted file mode 100644 index 254da155fa47..000000000000 --- a/Documentation/cpu-freq/amd-powernow.txt +++ /dev/null @@ -1,38 +0,0 @@ - -PowerNow! and Cool'n'Quiet are AMD names for frequency -management capabilities in AMD processors. As the hardware -implementation changes in new generations of the processors, -there is a different cpu-freq driver for each generation. - -Note that the driver's will not load on the "wrong" hardware, -so it is safe to try each driver in turn when in doubt as to -which is the correct driver. - -Note that the functionality to change frequency (and voltage) -is not available in all processors. The drivers will refuse -to load on processors without this capability. The capability -is detected with the cpuid instruction. - -The drivers use BIOS supplied tables to obtain frequency and -voltage information appropriate for a particular platform. -Frequency transitions will be unavailable if the BIOS does -not supply these tables. - -6th Generation: powernow-k6 - -7th Generation: powernow-k7: Athlon, Duron, Geode. - -8th Generation: powernow-k8: Athlon, Athlon 64, Opteron, Sempron. -Documentation on this functionality in 8th generation processors -is available in the "BIOS and Kernel Developer's Guide", publication -26094, in chapter 9, available for download from www.amd.com. - -BIOS supplied data, for powernow-k7 and for powernow-k8, may be -from either the PSB table or from ACPI objects. The ACPI support -is only available if the kernel config sets CONFIG_ACPI_PROCESSOR. -The powernow-k8 driver will attempt to use ACPI if so configured, -and fall back to PST if that fails. -The powernow-k7 driver will try to use the PSB support first, and -fall back to ACPI if the PSB support fails. A module parameter, -acpi_force, is provided to force ACPI support to be used instead -of PSB support. |