AnsweredAssumed Answered

About changing the default CPU frequency in i.MX6DQ.

Question asked by Keita Nagashima on Sep 25, 2015
Latest reply on Oct 4, 2015 by Yuri Muhin

Dear All,

 

Hello. I have a question about changing the CPU frequency.

Now, my customer is using jb4.2.2_1.1.0 and default CPU freq is 792MHz.

We want to change the CPU freq from 792MHz to 996MHz.

 

We tried to change the kernel parameter from arm_freq=800 to arm_freq=1000.

But, Warning log was repeated.

- COULD NOT SET SOC VOLTAGE BACK!!!!

- COULD NOT SET PU VOLTAGE!!!!

 

The error was outputted at the function of "function set_cpu_freq" under 'kernel_imx/src/arch/arm/plat-mxc/cpufreq.c'.

Maybe, it looks internal LDOs setting error.

 

[Question]

How should one change the CPU freq in U-boot?

 

Best Regards,

Keita

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