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AM6548: CPU frequency

Tony Tang
Mastermind 28922 points
Part Number: AM6548

What is the BogoMIPs relate to CPU frequency? 

I didn't find  $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors in PSDK 5.03 of AM654x. 

How to set CPU frequency?

  • 0
    TI__Guru**** 170625 points
    Hi Tony,

    The performance user guide states that AM65x EVM runs ARM at 800MHz freq:

    software-dl.ti.com/.../Release_Specific_Performance_Guide.html

    e2e.ti.com/.../711230


    I am not able to find how AM65x ARM frequency can be changed. I will ping our experts to check if they have something more.

    Regards,
    Pavel
  • 0 in reply to Pavel Botev
    TI__Guru** 100740 points
    Hello Tony,

    Update: we typically support changing the ARM frequency through cpufreq. At this point in time, cpufreq has not been implemented on AM65x.

    I am still looking into whether we currently support frequencies other than 800MHz for the ARM core in Linux. If we do, I will try to get a "suggested" way to make those frequency changes.

    Regards,
    Nick
  • 0 in reply to Nick Saulnier
    TI__Guru** 100740 points
    Hello Tony,

    Final update: At the moment, TI Linux only supports running the ARM core at 800MHz on AM65x. I expect that this will also be true for the June/July SDK release.

    In a later SDK, we will add support to select the operating point (OPP) at boot time through the device tree (800 MHz, 1GHz and 1.1 GHz). I cannot promise a timeline right now, but it seems likely to be in the October SDK release or the December SDK release.

    At this point in time, I do not see a timeline for adding support to change the CPU frequency at runtime. If this is a critical issue, please reach out to me offline and I will add your information where we need it.

    Regards,
    Nick