i.MX ProcessorsのトピックRe: Set CPU frequency to 800MHZ?

Set CPU frequency to 800MHZ?

weiqing — Thu, 10 Apr 2014 15:36:42 GMT

Hello all,

We are going to develop boards using i.MX6 solo. one model shall run at 800MHZ and the other model run at 1GHZ.

In order to simpliy the supply chain, it would be best buying only one type of i.MX6 solo, e.g. MCIMX6S5EVM10AC,

According to the description, it runs at 1GHz normally. is it possible to make it run at a maximal frequency of 800MHZ?

Changing the CPU core frequency will affect other peripherals?

And what is the proper way to set the core frequency? changing the Analog ARM PLL control register or others?

best regards,

weiqing

justin_jiang — Fri, 11 Apr 2014 04:50:07 GMT

Hi Weiqing,

Yes, if you are running Linux , you can add boot command in the uboot to set it run on 800MHz.

Please add this in the bootargs.

"arm_freq=800"

weiqing — Fri, 11 Apr 2014 08:48:01 GMT

Thanks for your reply, Qingrong.:smileyhappy:

What I am little uncertain is: if the e.g. MCIMX6S5EVM10AC runs at 800MHz, will is cause any unstable?

justin_jiang — Fri, 11 Apr 2014 09:30:31 GMT

:smileyhappy: MCIMX6S5EVM10AC can run to 1GHz, so it should be stable when running on 800MHz.

You can have a try on Freescale board firstly.

Actually, Freescale Linux driver will dynamic adjust the CPU frequency when running.

It will monitor the system loading and change frequency.