• 0
Tseng

Couldn't find the cpufreq folder of Linux on ZYBO

Question

I have successfully boot the Embedded Linux of Digilen-linux-Dev according to Embedded_Linux_Hands-on_Tutorial.pdf.

Now I want to simulate the DVFS using Linux's CPUFreq framework,so I managed to look up the Frequency Table and OPP list.But I didn't find the folder called "cpufreq" which might be located at "/sys/device/system/cpu/cpu0/cpufreq".

Where should I find this folder,because I want to know what  frequency/voltage set I can use to vary before I simulate DVFS operation.

Share this post


Link to post
Share on other sites

2 answers to this question

Recommended Posts

  • 0

Hi Tseng,

I personally don't know the answer, but I asked some of our applications engineers to see if they happen to know.

Thanks,
JColvin

Share this post


Link to post
Share on other sites
  • 0

I'm not familiar with this framework in linux, but I think this page may help you:

http://www.wiki.xilinx.com/Zynq+Power+Management

Ensure all the kernel config options specified there are enabled using menuconfig before building the kernel. You may also need to enable the PM_DEVFREQ option and some associated with it. Last thing I will mention is to make sure your devicetree has the bindings as described in the site above.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now