Re: [Ltib] LPC3250 low power mode?

[Li Yuan-Lung]

Dear Kevin,
Thank you for replying. We have tried the suspend function as the link said, but we got stock after the system suspending. The kernel did not come back after showing the suspending message.
Is there any other settings or tunning we should take care?

Say, after trace the suspend source code, we found the 'lpc32xx_sys_suspend()' will be moved to IRAM(0x8000000) and execute for suspending. The only related issue is: we have enabled the "CONFIG_ARCH_LPC32XX_IRAM_FOR_NET=y" in kernel config. Should we have to disable the option for the suspend function running?

Henry

2010/12/28 Kevin Wells <address@hidden>

Hi Henry,

 

The CPU and system clocks speeds are changed with the boot loader (S1L or kick start).

You may need to build a new version of the boot loader with your desired setup.

 

The Linux kernel has built-in power management and you should be able to enter the

suspend-to-mem state on the LPC32x0 and then wakeup on a specific event (ie, gpio,

SD card insertion, RTC alarm, etc.)

 

A basic write-up using the RTC alarm is here:

http://www.lpclinux.com/Forums/ForumLPC32xx0005

 

I know this works for the Phytec board, but it hasn’t been tested on the EA and FDI

boards with DDR memory, although the code should be complete.

 

Kevin

 

From: henry.li@wonselor.com [mailto:address@hidden] On Behalf Of Li Yuan-Lung
Sent: Friday, December 24, 2010 2:24 AM
To: Kevin Wells
Cc: address@hidden
Subject: [Ltib] LPC3250 low power mode?

 

Dear NXP members,
Now we have a new question, does the ltib have the ability to control the LPC3250 board to slow down the CPU frequency or any function to make the power saving(or power management?) with portable device requirement?

Merry Christmas!

Henry

-- 
Best Regards,

Henry Li
SW Engineer of Climax Co.
TEL: +886-2-2794-0001 ext.231
FAX: +886-2-2792-6618