imx6 Solo: MMC read hangs (Data CRC error)

dalmiaprashant — Wed, 23 Jul 2014 11:38:45 GMT

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

Re: imx6 Solo: MMC read hangs (Data CRC error)

Yuri — Mon, 28 Jul 2014 05:33:11 GMT

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".

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

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

i.MX ProcessorsのトピックRe: imx6 Solo: MMC read hangs (Data CRC error)

imx6 Solo: MMC read hangs (Data CRC error)

Re: imx6 Solo: MMC read hangs (Data CRC error)