How to modify code for hw change for ddr from 4 chip to 2 chip

[mingmingyuan]

How to modify code for hw change for ddr from 4 chip to 2 chip

[Yuri]

Hello,

  Changing DRAM parts from 4 to 2 may mean changing number of CSs or data

port size (32 or 16 bits). Corresponding parameters (MDASP[CS0_END] , MDCTL[DSIZ])
should be modified in initialization script or DCD table of U-boot.

Have a great day,
Yuri

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[mingmingyuan]

Hi sir：

thank you for your support!

imx6q default design ddr is 64 bit, How to change it to 32 bit?

can you give me some document about ddr?

[Yuri]

Hello,

MDCTL[DSIZ] = 01 for 32-bit.

Please refer to section MMDC Core Control Register (MMDCx_MDCTL)

in i.MX6 Reference manual for more details.

DRAM Customization on i.MX6x | NXP Community

Regards,

Yuri.