EVK Powermode

[sung-ukjang]

How to TEST Power-Save Mode in i.MX28 EVK hardware.?

Can Power-save mode using USB-5V Power source?

please let me know.

Thnaks.,

[Yuri]

To put the entire system into standby mode, run the following command:

# echo standby > /sys/power/state

Chapter 8 (i.MX28 Static Power Management Driver) of "MX28_EVK_Linux_Reference_Manual.pdf".

https://www.freescale.com/webapp/Download?colCode=L2.6.35_1.1.0_LINUX_DOCS&location=null&fpsp=1&Pare...

Power saving modes may be applied under USB-5V.

[sung-ukjang]

i want to TEST "Suspend-to-RAM (mem)" Mode.

But set to mem mode, no change mem mode.

How can i do mem mode TEST!

please refer to the below message..

root@freescale ~$ echo mem >/sys/power/state

PM: Syncing filesystems ...
done.

Freezing user space processes... (elapsed 0.00 seconds) done.

Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.

Suspending console(s) (use no_console_suspend to debug)

USB Host suspended

USB Gadget resumed

USB Host resumed

pm_op(): usb_dev_resume+0x0/0x18 returns -108

PM: Device usb1 failed to resume: error -108

Restarting tasks ... done.

root@freescale ~$

[Yuri]

From section 3.1 (New Features) of i.MX28 EVK Linux Release Notes

(MX28EVKLRN,Rev. L2.6.35_1.1.0, 02/2013) :

“Add suspend-to-RAM support”.

Next, the following is

Kernel Configuration:

    System Type  --->

        Freescale i.MXS implementations  --->

            support MX28 suspend-to RAM feature

In the original EVK design, DRAM power source is provided by the on-chip power supply

and it will be turned off during mem mode. In order to support suspend to RAM, it must be

connected to a constantly on power source rather than the on-chip power supply.

[sung-ukjang]

OK.

your mean, do i select "S1" is lower, right?

S1: Battery source selection switch

Upper position: real 4.2V Li-ion battery using J85/J86.

Lower position: simulated 4.2V battery with on-board EVK 4.2V regulator.

thnaks,

[Yuri]

S1 defines if the whole board will feed from a battery. For suspend-to-RAM mode it is necessary to power

DRAM only (and maybe RTC), when all the rest supply is OFF. The i.MX28 EVK does not support such mode.  

[sung-ukjang]

Dear.

    can you provide "mem mode" suport BSP??
 
 
 
 
 
 
 

[Yuri]

Please use  L2.6.35_1.1.0

https://www.freescale.com/webapp/Download?colCode=L2.6.35_1.1.0_ER_SOURCE&appType=license&location=n...