Assistance Required for Configuring A35 Core Frequency on i.MX8QXP MEK

[mbamarnath]

Hello Team,

I am working with the i.MX8QXP MEK and need to configure the A35 core frequency to 1 GHz from U-Boot for testing purposes. We are planning to run a set of proprietary benchmark applications on our custom RTOS, which is booted from U-Boot, and these tests need to be conducted across various operating frequencies.

Could you please advise on how I can set the A35 core frequency to a specific value from U-Boot? Any guidance or reference to the appropriate documentation for configuring the A35 CPU frequency from U-Boot would be greatly appreciated.

Thank you for your assistance.

Best regards,
Amar

[Rita_Wang]

For the linux you can modify in the dts file. For custom RTOS you can ask them to check on the net.

[mbamarnath]

Hello Rita,

Sorry for the late reply, our activities were paused for weeks.

Currently the RTOS doesn't configure any CPU frequency by itself instead it relies on the frequency set by the bootloader, in this case uboot.

So, where in u-boot are we configuring the CPU clock?

Regards,

Amar