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Last Post 15 Nov 2013 09:47 AM by  Zile
Default Clock of ARM and DSP Cores in Linux BSP
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steven.eckhoff
Basic Member
Basic Member
Posts:192


--
15 Nov 2013 09:22 AM

    Q:

    With LogicPD Linux BSP version 2.4-2, what is the default clock speed of the ARM core and DSP core setup to?


    How do you change to clock setting?

    A: This is documented in the Thermal Management white paper [1]. To see the current CPU frequency you can use cpufreq-info.

    DM-37x# cpufreq-info
    cpufrequtils 005: cpufreq-info (C) Dominik Brodowski 2004-2006
    Report errors and bugs to cpufreq@vger.kernel.org, please.
    analyzing CPU 0:
      driver: omap
      CPUs which need to switch frequency at the same time: 0
      hardware limits: 300 MHz - 1000 MHz
      available frequency steps: 300 MHz, 600 MHz, 800 MHz, 1000 MHz
      available cpufreq governors: conservative, userspace, ondemand, performance
      current policy: frequency should be within 300 MHz and 1000 MHz.
                      The governor "ondemand" may decide which speed to use
                      within this range.
      current CPU frequency is 300 MHz (asserted by call to hardware).
      cpufreq stats: 300 MHz:99.47%, 600 MHz:0.02%, 800 MHz:0.00%, 1000 MHz:0.50%  (21)

    For the DSP frequency, see table 2.2 in the Thermal Management white paper [1].

    [1] http://support.logicpd.co...id=0&EntryId=656

    Zile
    New Member
    New Member
    Posts:45


    --
    15 Nov 2013 09:47 AM
    Hello,

    Default CPU governor is ondemand, so frequency is changed from minimum (300MHz) to maximal frequency (800MHz or 1GHz), based on CPU load.

    To see this, you can type command in console:
    cpufreq-info

    I set frequency to the lowest value with:
    cpufreq-set -f 300MHz

    I'm not sure about DSP core frequency and settings.

    Regards
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