topic Re: IMX7 lower frequency support in i.MX Processors

IMX7 lower frequency support

gopinathsriniva — Wed, 13 Jun 2018 14:40:44 GMT

Hi All,

I am looking for lower frequency support in the range of 396MHz. Here a link that explains how to achieve this.

How can i change the core frequency on iMX7S module? - Toradex Community

I followed the same steps in IMX7 sabreSD board. But I am unable to run IMX7 processor in 396MHz, even I have disabled display and Ethernet as per that link. Instead processor is running in 648MHz.

Any suggestion would be greatly appreciated.

Thanks,

Gopinath S

Re: IMX7 lower frequency support

igorpadykov — Wed, 13 Jun 2018 23:25:06 GMT

Hi Gopinath

nxp official bsp have not 396MHz operating point in : linux/arch/arm/boot/dts/imx7d.dtsi

imx7d.dtsi\dts\boot\arm\arch - linux-imx - i.MX Linux kernel

also it is not listed in Table 9. Operating ranges i.MX7D Datasheet

http://cache.nxp.com/files/32bit/doc/data_sheet/IMX7DCEC.pdf

Best regards
igor
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Re: IMX7 lower frequency support

gopinathsriniva — Thu, 14 Jun 2018 06:06:20 GMT

Hi Igor,

Thank You for you reply. In the Table 9, there is one mode, which says "Operation at 800 MHz and below". Can you tell me what are all the supported frequencies below 800MH > From the TRM, in the section "Table 6-66. USB low-power boot frequencies" I can see 396MHz is possible.

Best Regards,

Gopi

Re: IMX7 lower frequency support

igorpadykov — Thu, 14 Jun 2018 07:23:00 GMT

Hi Gopinath

Table 9 shows all supported frequencies.

Best regards
igor

Re: IMX7 lower frequency support

alexandre_caron — Thu, 06 Feb 2020 18:14:12 GMT

Table 9 only show voltage for different frequency. There is not info about wich frequency is supported. I have the same problem. I cannot go lower than 648 Mhz