i.MX Processors中的主题 Re: A problem about write external memory

A problem about write external memory

zhangzhiyong1 — Sun, 02 Jul 2017 02:54:41 GMT

Hello ,I used IMX6Q in my design,There is a problem with me ,my design have a eMMC(8G Micron) and a uSSD(64G),I want test the memory.

step1 I use"dd if=/dev/zero of=/big_file bs=50M count=10",then It says"524288000 bytes (500.0MB) copied, 65.870651 seconds, 7.6MB/s",

step2 used"dd if=/dev/zero of=/big_file bs=50M count=10",then It says"524288000 bytes (500.0MB) copied, 98.181022 seconds, 5.1MB/s".

step3 hen I use "dd if=/dev/zero of=/big_file1 bs=50M count=10" then It says"

EXT3-fs error (device mmcblk0p1): ext3_free_blocks_sb: bit already cleared for block 6144
EXT3-fs error (device mmcblk0p1): ext3_free_blocks_sb: bit already cleared for block 6145
EXT3-fs error (device mmcblk0p1): ext3_free_blocks_sb: bit already cleared for block 6146
EXT3-fs error (device mmcblk0p1): ext3_free_blocks_sb: bit already cleared for block 6147

.......

and I can`t write memory more than 600M.If I write more than 600M，the system breakdown。

what`s wrong ? what can I do ?

Re: A problem about write external memory

igorpadykov — Sun, 02 Jul 2017 22:55:27 GMT

Hi zhangzhiyong

this may be caused by overall board instability when writing much data

and reason can be ddr errors, ripples of power supplies, signal integrity issues.

Please refer to i.MX6 System Development User’s Guide to better identify source of problem.

http://cache.freescale.com/files/32bit/doc/user_guide/IMX6DQ6SDLHDG.pdf

ext3_free_blocks_sb: bit already cleared may mean ext3 error with
partition was mounted read-only again and flagged with an error code. Please check :
https://ubuntuforums.org/archive/index.php/t-1044387.html
https://bugzilla.redhat.com/show_bug.cgi?id=494927

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