topic USB stops working after copy a large file in i.MX Processors

USB stops working after copy a large file

chenkongjun — Wed, 10 Sep 2014 02:29:10 GMT

Hi,

I plugin a USB memory on i.MX257-based board. It is detected and seems to work.

After mount USB to /mnt/usb,I start to test by loop copy a testfile from /mnt/usb folder

to /mnt/usb/temp folder.when the testfile size is over than 1M bytes,I/O error occurs

and it stops working(unmounts itself) after a while.

by the way,the linux kernel version is 2.6.28.

See the attached error log for more information. Appreciate any help to solve this trouble

Best Regards

igorpadykov — Wed, 10 Sep 2014 08:05:05 GMT

Hi chen

first I would highly suggest to move to more new kernel,

since it has better memory management

Second from log seems that this may be caused also by hardware, since

big size data transfer causes big noise on system, so additionally I would suggest to

test memory. Just for testing you may wish to decrease operating frequency (procesor and

memory) and test if issue will persist. Probably you can change memory stick, use

well known vendor.

Best regards

igor

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fabio_estevam — Wed, 10 Sep 2014 12:07:53 GMT

Yes, I would also recommend you using a more recent kernel.

You can try the latest stable 3.16.2.

chenkongjun — Thu, 11 Sep 2014 03:40:59 GMT

Hi igorpadykov

thank you for the reply.

In this project ,we have finished a lot of interface test except USB.

so recompile kernel is not the best way.

in order to find out the reason,i'll try to test by using a more recent kernel

Yuri — Fri, 12 Sep 2014 09:04:27 GMT

To be fully on safe side, please double check if oscillator provides correct frequency.

Sometimes it affects large file transfer, since USB is frequency sensitive.

~Yuri.