Check current AM335x clock speed?

qxc

Hi,

is there a register or something like that available where I can check the current clock the CPU is running with? I want to verify it is really working with maximum speed of 1GHz and not accidentially with something lower...

Thanks!

over 9 years ago

0 Yordan Kovachev over 9 years ago

TI__Guru**** 161600 points

Hi,
From user space you can use:
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq

Also please have a look at the following guides:

http://processors.wiki.ti.com/index.php/Linux_Core_Power_Management_User%27s_Guide_(v3.14)
processors.wiki.ti.com/.../Sitara_Linux_Training:_Power_Management
They contain some useful information about SItara power management.

Best Regards,
Yordan

0 qxc over 9 years ago in reply to Yordan Kovachev

Genius 5820 points

Hm, I'm not using Linux, my idea is to get this information from hardware registers directly. I found a "efuse_sma" register which provides a field "arm_mpu_max_freq", but this gives only information about the max frequency the MPU supports, notthe one it is actually runnign with.

0 Yordan Kovachev over 9 years ago in reply to qxc

TI__Guru**** 161600 points

Sorry for the misunderstanding.

I think Sections 3.1.3 MPU Subsystem Clock and Reset Distribution & 8.1.6.9 MPU PLL Description in AM335x TRM will be useful for your query.

Hope this helps.

Best Regards,
Yordan

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Check current AM335x clock speed?