IMX6D Linux3.10.53 chang DDR frequency 528 to 400MHZ

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IMX6D Linux3.10.53 chang DDR frequency 528 to 400MHZ

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dqz
Contributor II

i use IMX6D linux3.10.53

now i want to chang the DDR frequency from 528MHZ to 400MHZ,
First i change 528 to 400 in I.MX6DQSDL DDR3 Script Aid V0.10,and then i use this config to calibration config to do the DDR calibration , and i also have put these configs and it's calibration result to the DCD files in uboot.
Except these, need i to modify other code of kernel or uboot for changing  DDR frequency from 528MHZ to 400MHZ?
Thanks.

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi z

one can port codes for changing ddr frequency to uboot plugin.S

using examples in linux ddr3_freq_imx6.S:

mx6sabresd\freescale\board - uboot-imx - i.MX U-Boot 

ddr3_freq_imx6.S\mach-imx\arm\arch - linux-imx - i.MX Linux kernel 

Best regards
igor
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dqz
Contributor II

you mean if i want to chang the DDR frequency from 528MHZ to 400MHZ, i can change ddr frequency in uboot just once? do not need to change any kernel code?

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igorpadykov
NXP TechSupport
NXP TechSupport

you shoud change ddr3 frequency running code from OCRAM.

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