imx6 DDR calibration - U-boot or GUI ?

[aebischerquenti]

Hi everyone,

So I have been running two methods to calibrate DDR on our product (imx6Solo based board - 2x512 MB = 1GB of DDR3), the one with GUI based tool and the one with u-boot. 

I don't know why, but the results are quite different, especially for the Read DQS Gating calibration (MPDGCTRL0 PHY0).

With u-boot method, I get : 0x42280228.

With GUI based method, I get : 0x0238023C.

So U-boot method reports a value 29 times larger.

Also the Write level calibration (MMDC_MPWLDECTRL0 ch0) is 2,5 times bigger with GUI-based method than with U-boot.

I have verified each parameter passed to the aid script, and I invalidated cache in U-boot too, so I don't know what I did wrong in either method ?

Which method should I trust better ?

Regards,

Quentin

[igorpadykov]

Hi Quentin

nxp provides only option on link

i.MX6/7 DDR Stress Test Tool V2.60 | NXP Community 

may be recommended to use it.

Best regards
igor
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[aebischerquenti]

HI Igor,

Thanks for your answer, but I don't understand it. Which option is recommended by NXP ?

Regards,

Quentin

[igorpadykov]

Hi Quentin

it is ddr tool, nxp provides it on link

i.MX6/7 DDR Stress Test Tool V2.60 | NXP Community 

Best regards
igor

[aebischerquenti]

Hi Igor,

Yes I have tried the two methods specified in the link you provided, method 1 - GUI Based and method 3 - U-Boot.

Both methods are giving different results like I mentioned in my previous post. Which one is better in your opinion ?

Quentin