topic How to use DDR3 Calibration Values in i.MX Processors

How to use DDR3 Calibration Values

steveglover — Wed, 23 Mar 2016 14:05:39 GMT

I have a custom board based on an iMX6UL processor. I have used the DDR Stress Tester V2.51 to determine the DDR3 calibration values. Now I have the values, how do I include them into my linux build? Specifically, which file do I need to modify with the calibration values?

I am using the Yocto Project, build (imx-3.14.38-6UL_ga).

I have tried to find the file, the closest I found was a file called plugin.S which defines an assembler macro (imx6ul_ddr3_arm2_setting) which loads the DDR control registers. Is this the file to use?

Thanks for your help

Steve

Re: How to use DDR3 Calibration Values

Yuri — Thu, 24 Mar 2016 07:24:53 GMT

Hello,

Please use Chapter 1 (Porting U-Boot from an i.MX 6/7 Reference Board to

an i.MX 6/7 Custom Board) of "i.MX_BSP_Porting_Guide.pdf" in Linux docs.

http://www.nxp.com/webapp/Download?colCode=L3.14.52_1.1.0_LINUX_DOCS&Parent_nodeId=1337699481071706174845&Parent_pageTyp…

Also, the following may be helpful.

Freescale i.MX6 DRAM Port Application Guide-DDR3

Have a great day,
Yuri

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Re: How to use DDR3 Calibration Values

sunnyvan — Fri, 25 Mar 2016 15:27:57 GMT

New configuration settings can be added to uboot file :

uboot/.. mx6q_sabresd/flash_header.S