i.MX Processors中的主题 Re: eMMC request timeut error

eMMC request timeut error

nishadkamdar — Fri, 22 Jan 2021 06:38:02 GMT

We have a custom IMX8MM board with a 4GB eMMC chip connected.

We see the following error while emmc read/write test on the eMMC device:

mmc0: request with tag: 16 flags: 0x2000000002469030 timed out

Can anyone suggest why this timeout may have occurred ?

Thanks for the continued support.

Regards,

Nishad

weidong_sun — Fri, 22 Jan 2021 08:13:11 GMT

Hi,

i.MX8MM EMMC has never encountered such a problem, and you need to provide the following detailed information:

1. Is the customer's EMMC 1.8V IO or 3.3V IO?

2. Is the customer using LPDDR4 or DDR4?

3. Can the board start normally?

4. If possible, please provide the pdf schematic diagram and linux startup log.

Have a nice day!

B.R,

weidong

nishadkamdar — Sat, 23 Jan 2021 14:30:21 GMT

Hello,

Thanks for the quick reply.

The customer eMMC is 1.8v. It uses LPDDR4 and the board boots fine as well.

Sorry cannot share the schematic for privacy reasons.

The error also seems related to command queue.

mmc_blk_cmdq_err err

Thanks and regards,

Nishad

weidong_sun — Mon, 25 Jan 2021 03:59:47 GMT

Hi,

You can try to add the following member to device tree:

---------------------

no-1-8-v;

----------------------

Then try.

Have a nice day!

B.R,

Weidong

Stefan_ng — Thu, 15 Jul 2021 09:06:48 GMT

Hi Nishad,

Have you solved the problem?

If hopefully yes, the question is how?

Thank you,

Stefan