IMX6Q change to 32bit 1GB DDR3

[jiejia]

为了降低布线的难度，我们想只使用2片DDR3。想请问下，IMX6Q支持32bit的DDR3吗？如果支持的话，DRAM_CS0和DRAM_CS1要如何接线呢？

[igorpadykov]

Q: IMX6Q support 32bit of DDR3 do? If supported, DRAM_CS0 and DRAM_CS1 to how to wire it?

A: yes, please check sect.3.3 DDR connection information

i.MX6 System Development User’s Guide

http://cache.freescale.com/files/32bit/doc/user_guide/IMX6DQ6SDLHDG.pdf

For 64bit bus connect DRAM_CS0 and DRAM_CS1 together

Best regards
igor
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[jiejia]

Hi,igor

  In mx6q sabresd borad, there are 4 ddr3. In my imx6q borad, I want to use 2 DDR3(32bit bus). Would it be ok?

For 32bit bus, should I connect the 2 ddr3 to DRAM_CS0  or      connect the 2 ddr3 to DRAM_CS0 and DRAM_CS1?

How to change u-boot to make it work?

[igorpadykov]

2 DDR3(32bit bus) would it be ok, for 32bit bus connect the 2 ddr3 to DRAM_CS0 and DRAM_CS1

~igor

[jiejia]

I saw this article: Calibration of i.mx6 32bit bus DDR3 with 2 CS 

At the end:We do not have such tool if memories populated on CSD1 are NOT “mirrored” with the memories populated on CSD0.  What does "mirrored" means?  

[igorpadykov]

“mirrored” means the identical topology and trace length for CSD1 memory side.

[jiejia]

If the DDR memory devices are populated on CSD0, Would it be ok? It seems very strict while the 2 DDR memory devices are populated on CSD0 and CSD2.