imx6q lpddr2 slow read write

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imx6q lpddr2 slow read write

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vieshoth_n
Contributor I

We are working on the imx6q pop based som. We use 1GB lpddr2 (part number - MT42L128M64D2LL-25 AT:A) in our som. This lpddr2 has 2 channels and non interleaved. The CHANNEL0 has the address range from 0x80000000 to 0x9fffffff and CHANNEL1 has address range from 0x10000000 to 0x2fffffff. 

 

I can see a read and write time difference in between these two address regions. 

 

Reading and writing in the address space 0x80000000 - 0x9fffffff takes more time than reading and writing in the address range 0x10000000 - 0x2fffffff. 

 

What could be reason?  Can someone guide on me on this. I have attached my DCD here.

Please let me know if more details needed

NOTE: To test read and write in lpddr2 I use mtest command in u-boot.

 

 

 

Regards,

Vieshoth.N

Original Attachment has been moved to: dcd.cfg.zip

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Vieshoth

please check sect.44.5 Performance i.MX6DQ Reference Manual

http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf
and try with baremetal test.

Best regards
igor
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