topic Re: [Urgent]Question about Reducing power consumption in i.MX Processors

[Urgent]Question about Reducing power consumption

ko-hey — Tue, 04 Jul 2017 00:45:49 GMT

Hi all

We are considering reducing SOC and ARM power consumption.
I would like to change the clock root frequency of AXI, AHB, IPG from the information written in the Reducing Power Consumption of page 5 of AN 5383, but I can not boot with either fix.

Q1
There seems to be some limitation on the clock root frequency of AXI, AHB, IPG, but can you give me relevant information?

When entering Wait mode or Deep sleep mode, we have to adjust the frequency of the above 3 clocks.

Is there any change procedure and sample source code ?

Ko-hey

Re: [Urgent]Question about Reducing power consumption

Yuri — Tue, 04 Jul 2017 02:36:51 GMT

Hello,

recommended configurations are provided in NXP Linux BSP, please use

sections 2.3.3 [CPU Frequency Scaling (CPUFREQ)] and 2.3.4 (Dynamic Bus Frequency) of

recent i.MX_Linux_Reference_Manual.pdf. The documentation contains information where working

points and source codes may be found.

Recent BSP doc package :

http://www.nxp.com/webapp/Download?colCode=L4.1.15_2.1.0_LINUX_DOCS&Parent_nodeId=1337699481071706174845&Parent_pageType…

Summary Page :

i.MX 6 / i.MX 7 Series Software and Development Tool|NXP

Have a great day,
Yuri

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Re: [Urgent]Question about Reducing power consumption

ko-hey — Tue, 04 Jul 2017 02:58:06 GMT

Hi Yuri

Thank you for quick reply.

Maybe the section which you mentioned is section 23 and 24.

Am I correct ?

Ko-hey

Re: [Urgent]Question about Reducing power consumption

Yuri — Tue, 04 Jul 2017 03:07:31 GMT

I meant the recent doc package. It has slightly different structure.

Regards,

Yuri.

Re: [Urgent]Question about Reducing power consumption

ko-hey — Tue, 04 Jul 2017 03:54:04 GMT

Yuri

I understand.

Thank you.

Ko-hey