[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Ltib] RE: JFFS2 crc errors

From: Chris Westervelt
Subject: [Ltib] RE: JFFS2 crc errors
Date: Wed, 4 Aug 2010 15:41:47 -0500

No I  just made some changes to the rootfs and saved them back.  After a power down and reboot, it started reporting this.  The product cannot be software shut down and must tolerate abrupt power loss.  If that is something we must consider in design then I need to get any appropriate changes made to the hardware/software to correct or tolerate this condition.  This is not the first time I have seen this in fact it almost always happens when we change the rootfs in any way.  I just wanted to better understand it and make sure it’s not a problem.



From: Kevin Wells [mailto:address@hidden
Sent: Wednesday, August 04, 2010 3:53 PM
To: Chris Westervelt; address@hidden
Subject: RE: JFFS2 crc errors


Hi Chris,


This can happen if something is writing to the NAND when the system is abruptly powered off or reset. Only part of the data will have been written to NAND.

Was the board shut down with the ‘reboot’ or ‘poweroff’ commands? This should give you a safe shutdown of JFFS2. An abrupt power cycle or reset can lead to issues with JFFS2 data (similar to any file system).






Subject: [Ltib] JFFS2 crc errors




I have started the phase of our project where we are weaning off NFS and using JFFS2.  Now my understanding is the flash should work just like a normal drive but I am seeing errors about failed CRCs that I don’t understand.  Is this normal or do we have a real problem here?  Also, if it is normal, is there a way to suppress these messages and or automatic checks.  The following is what I see.


address@hidden /]# JFFS2 notice: (309) check_node_data: wrong data CRC in data node at 0x01dd4000: read 0x971bfcf, calculated 0xe401df4b.

JFFS2 notice: (309) check_node_data: wrong data CRC in data node at 0x01dd59b0: read 0x7299d564, calculated 0x4a339945.


Chris Westervelt

Senior Product Development Engineer

Infrasafe, Inc.
12612 Challenger Pkwy
Suite 300
Orlando, FL
Office:   (407) 926-6983

Mobile: (407) 595-7023       
Fax:    (407) 857-1635

Notice of Confidentiality:
This e-mail communication and the attachments hereto, if any, are intended solely for the information and use of the addressee(s) identified above and may contain information which is legally privileged and/or otherwise confidential. If a recipient of this e-mail communication is not an addressee (or an authorized representative of an addressee), such recipient is hereby advised that any review, disclosure, reproduction, re-transmission or other dissemination or use of this e-mail communication (or any information contained herein) is strictly prohibited. If you are not an addressee and have received this e-mail communication in error, please advise the sender of that circumstance either by reply e-mail or by telephone at (800) 238-2686, immediately delete this e-mail communication from any computer and destroy all physical copies of same.


reply via email to

[Prev in Thread] Current Thread [Next in Thread]