IMX6ULL ... power management

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IMX6ULL ... power management

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fabio_poiatti
Contributor III

Hi

I red some documents and discussion about the power management for the IMX6ULL.

But I'm a little confused ...

It seems needed to add some support on linux menu config and also it is possible to configure "disabled"

some peropherals or component.

Q1. With default configuration ... the processor is already in a low power configuration with all unused component disabled and with all support included in the kernel?

Q2. For the wake up there are a few possibilities ... to flow from one state to another (RUN, WAIT, STOP, DORMANT) I have to make some software action?

Q3. Software point of view ... what I have to do?

Q4. Is there an example about these features just to have an idea about the sotware development?

Thanks

Fabio

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igorpadykov
NXP Employee
NXP Employee

Hi fabio

device tree structures (like status = "okay";) are described in AN5125

Introduction to Device Trees

https://www.nxp.com/docs/en/application-note/AN5125.pdf 

Power managements configs are described in sect.2.5 Power Management

attached Linux Manual.

Best regards
igor
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fabio_poiatti
Contributor III

thanks

but I'm looking for an example about power management

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igorpadykov
NXP Employee
NXP Employee
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fabio_poiatti
Contributor III

sorry but I don't understand ...

I would like a c program with some examples of using PM features

How is possible to go for example in a WAIT state from RUN?

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igorpadykov
NXP Employee
NXP Employee

also some examples (can be reused for i.MX6ULL) can be found

in i.MX6Q baremetal SDK (../power_modes_test), it
(1.1.0_iMX6_Platform_SDK.zip) can be found on link SMP Enable in IMX6 

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fabio_poiatti
Contributor III

thanks

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fabio_poiatti
Contributor III

I tried to go on mem or standby state with uart enabled for wake up.

All is working but the data coming from the uart that wake up the system

are lost

Any suggestion?

Is it possible to configure the processor automatically goes in a low power mode when

where is nothing to do?

In my application mainly the processor has to process some packets coming

from uart with a rate of 5 seconds

thanks

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igorpadykov
NXP Employee
NXP Employee

suggest to create new threads for new questions.

Best regards
igor

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