topic Modifying CPU and LPDDR4 Frequency in i.MX Processors

Modifying CPU and LPDDR4 Frequency

sd05 — Wed, 14 Jul 2021 09:17:02 GMT

Hello Community Members,

We are using a DART-MX8MM-Mini based custom board. We are observing that when we execute our application that streams camera captured images on the LCD screen, the temperature reaches 85 deg C which is not acceptable so we want our system to drive at half of CPU & LPDDR4 frequency in the kernel.

Currently, CPU Frequency is 1200MHZ and LPDDR4 frequency is 750MHZ

How can we achieve CPU frequency around 600MHZ and LPDDR4 frequency of 375MHZ?

Please guide.

Thanks in advance.

Re: Modifying CPU and LPDDR4 Frequency

Yuri — Wed, 14 Jul 2021 11:06:32 GMT

@sd05
Hello,

To modify the DRAM Frequency for a custom setting refer to

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/iMX-8M-Mini-Register-Programming-Aid-DRAM-PLL-setting/ta-p/1112094

"i.MX 8M Family DDR Tool Release"

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX-8M-Family-DDR-Tool-Release/ta-p/1104467

For CPU frequency - use Linux CPUFREQ settings.

https://www.nxp.com/docs/en/reference-manual/IMX_REFERENCE_MANUAL.pdf

Regards,
Yuri.