How to underclock an iMX6 Quad Sabre Lite board?

[blevefrancesco]

I need to underclock an iMX6 Quad Sabre Lite board down to 800 MHz.

At the moment on this board I'm running Yocto Linux and Android 5.1.1.

For Yocto Linux I read on this forum that is possible to accomplish it modifying the BSP, before building the image, but I didn't find any suggestion on how to do it.

I would be glad if someone could explain me in which way I should modify the BSP.

For Android 5.1.1 instead I'm running a ready made image, built by Boundary Devices (for Android 5.1.1 there is no source code provided).

Could be possible to underclock the board even with a ready made image?

Otherwise I would have to downgrade to Android 5.0 for which they provide the source code and try to underclock that one.

Also in this case, any suggestion on how to do it?

Thanks!

[igorpadykov · Accepted solution]

Hi Francesco

one can try to change cpu frequency working points as described in

attached Linux Manual sect.24.1.2 Source Code Structure

Best regards

igor

[blevefrancesco]

Thank you!

I found also this useful guide on the internet that could help people with the same issue:

https://software.intel.com/sites/default/files/comment/1716807/how-to-change-frequency-on-linux-pub....