How to update UBIFS while running an application ?

Hello,

I have 3 UBIFS mounted - one is the RFS, another one is mounted in /mnt/ubi1/ and the last one is mounted in /mnt/ubi2/
My main application is in /mnt/ubi1/ and is running.

How could I update the actual ubifs ubi0_0, ubi1_0 and ubi2_0 ?

I tried ist with
1.) flash_eraseall
2.) nandwrite
---> This doesn´t work -> after restart I got errors -> RFS is damaged and doesn´t boot anymore

another try:
1.) ubiupdatevol
-----> the problem - this program doesn´t work if the ubifs is mounted
- but I can´t unmount /mnt/ubi1 or /mnt/ubi2 or the RFS because there are applications running.

So what can I do to solve this problem ?

Thank you

Hi,

I could not chat to you because my client died, sorry.

I'm not sure what exactly you ask, but you cannot update UBIFS file system while it is mounted. You have to unmount it first. Does any file-system allows this at all?

Or I misunderstood your questions?

Best regards,
Artem Bityutskiy (Битюцкий Артём)

While not entirely koscher, one way around the problem of upgrading a system with a root file system is flash based, is to get the application into memory (possibly lock down the pages), rewrite the root file system without unmounting it, then rebooting immediately after.

I don't know if this would work with UBIFS, but given the right circumstances it works fine with JFFS2.

/Ricard
--
Ricard Wolf Wanderlöf ricardw(at)axis.com
Axis Communications AB, Lund, Sweden www.axis.com
Phone +46 46 272 2016 Fax +46 46 13 61 30