How to edit u-boot according to the DDR calibration values ?

[peteramond]

Dear All,

1) I have done DDR stress test and calibration using DDR stres test tool v2.60 for my iMAX6 Quad processor based custom hardware design. And I'm referring to the nitrogen6X uboot files and which files and locations should I edit using calibrations values ?

2) Initially I have an understanding about doing this according to the following procedure.

We should edit ;

# include "ddr-setup.cfg"

# include "1066mhz4*128*16.cfg"

# include "clock-cfg"

files. But according to my understanding "ddr-setup.cfg" and "clock-cfg" are generic files and we don't have to edit those files. As well as finally we need to recompile the defconfig files. So is this procedure correct ? Do we have to edit more than this ?

3) In some forums mentioned that we need to edit flash_header.S file. What is this ? I couldn't find such file in nitrogen6X u-boot.

I must be thankful to you if you will kindly advice me on this.

Regards & Thanks,

Peter.

[peteramond]

Hi Gary,

gary_bisson‌

Please look at the following figure. Left side DDR calibration result and right side cfg file. 

Is that enough just replacing the values of .cfg file with the highlighted values of the DDR calibration values ? Any more changes to do ?

Regards,

Peter.  

[Yuri]

Hello,

  Please use "i.MX_BSP_Porting_Guide.pdf" of NXP BSP documentation.

http://www.nxp.com/products/software-and-tools/software-development-tools/i.mx-software-and-tools/i.... 

Have a great day,
Yuri

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[peteramond]

Hi Yuri,

Please look at the following figure. Left side DDR calibration result and right side cfg file. 

Is that enough just replacing the values of .cfg file with the highlighted values of the DDR calibration values ? Any more changes to do ?

Regards,

Peter.  

[Yuri]

Hello,

  Write leveling calibrations are not involved in Your considerations, MMDCx_MPWLDECTRL0/1

Regards,

Yuri.

[peteramond]

Hi Yuri,

Thank you for the reply.

Please see the following comparison in Sabre Lite .cfg file (#include "1066mhz-4*128m*16.cfg) and its DDR calibration tool values (Skhynix H5TC2GB3FFR PBA). The values in calibration tool is completely different with the cfg file values. So why is that ? Though I run the test again and again I can get only those values. 

So what I need to confirm is how I clarify the values in DDR tool is correct or not ? 

Regards,

Peter.

[Yuri]

Hello,

  to verify the values in DDR tool - use them in initialization script and run tests (say, Over Night Test)

again, without (new) calibration.  

Regards,

Yuri.

[gary_bisson]

Hi Peter,

Yes ddr-setup.cfg and clock.cfg are generic, only the 1066mhz_4x128mx16.cfg needs to be modified with the values from the imx ddr stress tool:

https://community.nxp.com/docs/DOC-105652 

Note that it is already the case for our platforms so I'm not sure what you are trying to do here.

Finally, this cfg will be translated into a DCD table which will be in the "header" you are mentioning, so nothing else to do.

Regards,

Gary

[peteramond]

Hi Gary,

gary_bisson‌

Many thanks for your reply. 

What did you mean by "cfg translated into a DCD table" ? How should I do this ?

From where can I find "header" in nitrogen6x u-boot ? Can you give me the file path ?

Regards,

Peter.

[gary_bisson]

Hi Peter,

You have nothing to do, it is part of uboot build, the u-boot.imx generated contains the header within which the configuration files are included.

Regards,

Gary