imx6 Solo: MMC read hangs (Data CRC error)

[dalmiaprashant]

Hello Community.

I am trying to read the kernel from the MMC card using command below:

mmc read 0x10800000 0x800 0x2000

mmc0 is current device

MMC read: dev # 0, block # 2048, count 8192 ... hangs

ON debug found data CRC error on read.

Write works perfectly OK.

I tried to read smaller chunks it reads randomly and hangs sometimes.

Could you please suggest possible problems.

With Regards,

Prashant

[Yuri]

1.

If it is Your own design, please check the board regarding PCB layout recommendations
in "Hardware Development Guide for i.MX 6 ..." . In particular :

"For SD module interfaces:

– Match data and CMD trace lengths (length delta depends on bus rates)

– CLK should be longer than the longest signal in the Data/CMD group (+5 mils)

— Similar DDR rules must be followed for data, address and control as for SD module inter".

2.

Also, please try to check the memory 

“i.MX6 DDR Stress Test Tool V1.0.3”

https://community.freescale.com/docs/DOC-96412

Have a great day,
Yuri

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