topic Re: LS1043 POWER DOWN MODE in Layerscape

LS1043 POWER DOWN MODE

nikhilprakash — Sun, 21 Feb 2016 16:51:10 GMT

Hi,

I am currently working on LS1043ARDB reference board.I am a bit confused about the power down mode.Could anyone suggest me on how the power down mode can be set in LS1043ARDB.Also will the nand flash interface(ifc)be up at that time???Please help me.

Thanks in advance

Re: LS1043 POWER DOWN MODE

ufedor — Tue, 23 Feb 2016 03:34:25 GMT

1) You wrote:

> I am a bit confused about the power down mode.

Which exactly place in the board's documentation is unclear?

2) Also will the nand flash be up at that time?

NAND Flash is powered from +1_8V which is always on.

Re: LS1043 POWER DOWN MODE

nikhilprakash — Tue, 23 Feb 2016 05:04:26 GMT

Hi ufedor,

First of all thanks for the quick response.I am confused on how to set the power down mode in LS1043ARDB board.Also does that have any effect on ifc interface???Please help....

Thanks in advance

Re: LS1043 POWER DOWN MODE

ufedor — Tue, 23 Feb 2016 05:07:28 GMT

Where exactly in the RDB documentation the power down mode is mentioned?

Re: LS1043 POWER DOWN MODE

nikhilprakash — Tue, 23 Feb 2016 05:22:10 GMT

Hi ufedor,

I am going through the "Run Control and Power Management" chapter.

Thanks in advance

Re: LS1043 POWER DOWN MODE

ufedor — Tue, 23 Feb 2016 05:24:29 GMT

Of which exactly document?

What is its name, revision?

Re: LS1043 POWER DOWN MODE

nikhilprakash — Tue, 23 Feb 2016 05:27:57 GMT

Hi ufedor,

Reference manual REV D and REV C.

Re: LS1043 POWER DOWN MODE

ufedor — Tue, 23 Feb 2016 05:37:59 GMT

Excuse me, the QorIQ LS1043A Reference Manual, Rev. D, Chapter 13 Run Control and Power Management (RCPM) does not mention "power down" mode. Which exacly RM section or statement is in question?

Re: LS1043 POWER DOWN MODE

nikhilprakash — Tue, 23 Feb 2016 05:46:27 GMT

Hi ufedor,

Could you please suggest me on how to set power down mode in LS1043ARDB.Also could you suggest me where to refer to for this section.Please help.

Re: LS1043 POWER DOWN MODE

ufedor — Tue, 23 Feb 2016 08:29:07 GMT

Supported power management mode is CPU Hotplug.

You can offline cpu at runtime.

/* Offline cpu */

echo 0 > /sys/devices/system/cpu/cpu#/online

Note: cpu# is the cpu number you want to offline. cpu0 could not plug off as boot core.

/* Online cpu */

echo 1 > /sys/devices/system/cpu/cpu#/online

Note: For e6500 based cores, if all cores in one cluster are offline the cluster will automatically enter PCL10 state to save more power.

Re: LS1043 POWER DOWN MODE

nikhilprakash — Tue, 23 Feb 2016 09:10:49 GMT

Thanks ufedor.