Arndale

How to change the clock in Arndale

Asked by Conrado PLG

It seems that the Linaro quick image sets the clock at 1 GHz.

- Is this correct?
- Is it possible to change the clock?
- Is frequency scaling enabled in the image?

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Rony Nandy
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Best Rony Nandy (rony-nandy) said : 		#1

It seems that the Linaro quick image sets the clock at 1 GHz.

- Is this correct?
Ans: No more.Use the 3.7 rebased code for kernel with PM or wait for the 13.1 release

- Is it possible to change the clock?

yes;

In u-boot:
1. For 1.4 GHz following change is needed in include/configs/arndale5250.h

-#define CONFIG_ARM_CLK_FREQ 1000 /* in MHz*/
+#define CONFIG_ARM_CLK_FREQ 1400 /* in MHz*/

Source:https://bugs.launchpad.net/arndale/+bug/1078590 ;comment number 2

- Is frequency scaling enabled in the image?
Wait for 13.1 release,which will come in a few days time. Else you can use the 3.7 rebased kernel from my tree http://git.linaro.org/gitweb?p=people/ronynandy/linux_stable.git;a=shortlog;h=refs/heads/lue_arndale_3.7 which has the Power Management implemented to create your image.

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Conrado PLG (conradoplg) said : 		#2

Thanks Rony Nandy, that solved my question.