[yocto] JFFS2 doesn't use OOB on CCIMX53

[Mariano Dominguez]

Hi,
I'm using Connect Core IMX53 board with Kernel version 2.6.35.14 and Yocto
1.4 OS.
I have a random problem when writing operations are done over the Nand
Flash: for instance when I insert rows into the database (the file grows)
or when I copy new files to the jffs2 partition. Sometimes I got an
input/output error and after that I won't be able to recovery the file
neither if I try to remove or if a try to copy a new file which override
the one who has problem.

Below you can see the logs:
When I insert "ls" command, the terminal throw:
'./res' input/output error   ("res" is the folders name)
And if I check the Kernel log:
jffs2_scan_inode_node(): CRC failed on node at 0x0df497c0: Read 0xffffffff,
calculated 0x33b7fc9f
JFFS2 error: (1) jffs2_build_inode_pass1: child dir "res" (ino #9334) of
dir ino #9333 appears to be a hard link
JFFS2 warning: (973) jffs2_get_inode_nodes: Eep. No valid nodes for ino
#9334.
JFFS2 warning: (973) jffs2_do_read_inode_internal: no data nodes found for
ino #9334
iget() failed for ino #9334
JFFS2 notice: (746) check_node_data: wrong data CRC in data node at
0x0df47474: read 0xfbf9abb7, calculated 0xbf64ad10.
JFFS2 warning: (1016) jffs2_get_inode_nodes: Eep. No valid nodes for ino
#9334.
JFFS2 warning: (1016) jffs2_do_read_inode_internal: no data nodes found for
ino #9334

Also I checked in U-boot if exist any bad blocks and it doesn't.
I was researching how a Nand flash works and I found that it has an
Out-of-Band (OOB) area that contains an Error-Correcting-Code (ECC)
algorithm. This ECC is used to check and fix any possible writing error.
So, when I was checking if that feature is enabled in my board I found in
the kernel log the message:

user.warn kernel: Memory policy: ECC disabled, Data cache writeback
user.info kernel: JFFS2 doesn't use OOB.


I want to know if my hypothesis is correct and how can i enable and use the
ECC and OOB?

Thanks

-- 

<http://www.tallertechnologies.com>


Mariano Dominguez

Software Engineer

Taller Technologies Argentina

San Lorenzo 47, 3rd Floor, Office 5

Córdoba, Argentina

Mobile: +5435157157848
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