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How to set cpu freq in the SDK 7.0?

vc ip
Intellectual 290 points

hello all,
  How to set cpu freq in the SDK 7.0?
  If I have setup cpu freq in the u-boot, when kernel startup, can cpu freq be changed?
  in the SDK 6.0, I see that cpu freq is u-boot's setup, but in the SDK 7.0, I see that cpu freq is 1GHz, not u-boot's setup.
 
  cpufreq config:
  [*] CPU Frequency scaling  
  <*>   CPU frequency translation statistics (NEW)
  Default CPUFreq governor (performance)
  ARM CPU frequency scaling drivers  --->  
       [*] TI OMAP2+ (NEW)


  Thanks!

  • 0
    TI__Guru**** 393215 points

    I will ask somebody from the factory team to take a look at this.

  • 0 in reply to Biser Gatchev-XID
    Intellectual 290 points

    thanks biser.

    if I want setup cpufreq in kernel, how to do? thanks

  • 0 in reply to vc ip
    Intellectual 290 points

    dear biser,

    do you ask this problem? thanks

  • 0 in reply to vc ip
    TI__Genius 15510 points

    Take a look in the /sys/devices/system/cpu/cpu0/cpufreq directory. You can see various values you can change:

    root@am335x-evm:/sys/devices/system/cpu/cpu0/cpufreq# ls -l
    -r--r--r--    1 root     root          4096 Mar 25 09:04 affected_cpus
    -r--------    1 root     root          4096 Mar 25 09:04 cpuinfo_cur_freq
    -r--r--r--    1 root     root          4096 Mar 25 09:04 cpuinfo_max_freq
    -r--r--r--    1 root     root          4096 Mar 25 09:04 cpuinfo_min_freq
    -r--r--r--    1 root     root          4096 Mar 25 09:04 cpuinfo_transition_latn
    cy
    -r--r--r--    1 root     root          4096 Mar 25 09:04 related_cpus
    -r--r--r--    1 root     root          4096 Mar 25 09:04 scaling_available_freqe
    ncies
    -r--r--r--    1 root     root          4096 Mar 25 09:04 scaling_available_goven
    ors
    -r--r--r--    1 root     root          4096 Mar 25 09:04 scaling_cur_freq
    -r--r--r--    1 root     root          4096 Mar 25 09:04 scaling_driver
    -rw-r--r--    1 root     root          4096 Mar 25 09:04 scaling_governor
    -rw-r--r--    1 root     root          4096 Mar 25 09:04 scaling_max_freq
    -rw-r--r--    1 root     root          4096 Mar 25 09:04 scaling_min_freq
    -rw-r--r--    1 root     root          4096 Mar 25 09:21 scaling_setspeed
    drwxr-xr-x    2 root     root             0 Mar 25 09:04 stats
    root@am335x-evm:/sys/devices/system/cpu/cpu0/cpufreq#

    To see the available cpu speeds, cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequences. To set a cpu speed, say 500000, echo 500000 >/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed.

    Steve K.

  • 0 in reply to Steve Kipisz
    Intellectual 290 points

    dear Steve，
        on the kernel v3.2, I set cpufreq is 720M at u-boot, when boot, cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequences, it is 720
        but on the kernel v3.12.10, I set cpufreq is 720M at u-boot, when boot, cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequences, it is 1G, is it right?