topic Re: Power management Power consumption : ARM Core off in i.MX Processors

Power management Power consumption : ARM Core off

cader — Fri, 08 Mar 2013 07:34:11 GMT

Dear Freescale Support Team,

We are working on the Power management Module on i.MX6Q Based SabreSDP Platform with B5 Revision and the Processor Revision is 1.2(i.e AC)

We would like to know about the ARM Power off sequence in i.MX6q and any one has the procedure to Enter in to the ARM Power off state please share.

And i would like to know any other module dependency with ARM Power off . What is the power consumption will reduce if ARM Power off performed in the SabreSDP Platform.

Any other documentation for suspend and resume what is the exact procedure. How to make sure ARM is in Power OFF mode.

Best Regards,

Cader.

Re: Power management Power consumption : ARM Core off

Yuri — Wed, 13 Mar 2013 04:33:51 GMT

As for power consumption please use the next app notes :

http://cache.freescale.com/files/32bit/doc/app_note/AN4509.pdf

http://cache.freescale.com/files/32bit/doc/app_note/AN4576.pdf

The mentioned app notes relate to Linux BSP :

https://www.freescale.com/webapp/Download?colCode=L3.0.35_1.1.0_SOURCE&appType=license&location=null

https://www.freescale.com/webapp/Download?colCode=L3.0.35_3.0.0_ER_SOURCE&appType=license&location=null

Please use Linux documentation for information about source files, responsible

for power saving modes.

https://www.freescale.com/webapp/Download?colCode=L3.0.35_1.1.0_LINUXDOCS_BUNDLE&location=null

In particular, please look at Chapter 16 "Low-level Power Management (PM) Driver"

of "Linux_6DQ_RM_L3.0.35_1.1.0.pdf".

Also the SDK contains examples.

Please look at Chapter 24 (Configuring the Power Modes) of "iMX6_Firmware_Guide.pdf".

https://www.freescale.com/webapp/Download?colCode=i.MX6_PLATFORM_SDK&location=null

Re: Power management Power consumption : ARM Core off

Oceanblue — Sat, 04 May 2013 09:21:37 GMT

Hi Yuri,

Could you please explain a little detail about Power off sequence? we have met the same problem, and expect to port it on ourselves power management circuit. thanks

JK W

Re: Power management Power consumption : ARM Core off

Yuri — Mon, 06 May 2013 02:21:01 GMT

Please look at section 5 (Use case configuration and usage guidelines) of app note AN4576 (i.MX 6DualLite Power Consumption Measurement), in particular, for Deep-Sleep mode :

echo mem > /sys/power/state