What is wrong?

[Leon Pollak <leonp@plris.com>]

Hello, all.
I will be very thankful for any hint...:)

I use JFFS2 version 2.2.(NAND)(SUMMARY)(C) 2001-2006 Red Hat, Inc. 
(comes with MontaVistaPro 5.0). Kernel 2.6.18.
I prepare JFFS2 partition with mkfs.jffs2 and sumtool and burn it with 
flash_eraseall and 'nandwrite -p'.
Everything works fine.

The NAND is write protected by HW and the partition is mounted as RO. 
At some moment I need to update a small file. 
So I do: 
- HW write protect off, 
- remount RW, 
- update file, 
- sync, 
- remount RO, 
- write protect on.

Looking at linux console I see a lot of messages like:
Erase at 0x00400000 failed immediately: errno -5
Erase at 0x003e0000 failed immediately: errno -5
......
Erase at 0x00340000 failed immediately: errno -5
jffs2_flush_wbuf(): Write failed with -5
Write of 2016 bytes at 0x002578a0 failed. returned -5, retlen 0
Not marking the space at 0x002578a0 as dirty because the flash driver 
returned retlen zero.


This is repeated for a long time, but everything seems work OK.
The sequential starts and even file updates are also OK, without error 
messages.

What do I do wrong? Thanks a lot.

--  
Leon