How to update my RFS ?

[Manuel Sahm]

Hello,

could anybody explain me how to update my RFS ?

Procedure:
--------------
system boots from nandflash partition (mtdblock3) [jffs2 image inside]

/tmp is mounted as a tmpfs
I copy nandwrite and flash_eraseall utility to /tmp
cd /tmp
/tmp/flash_eraseall -j /dev/mtd3
/tmp/nandwrite /dev/mtd3 ./RFS.jffs2
reboot

Some errors occurs after reboot : jffs2-scan_eraseblock magib bitmask 
0x1985 etc.

I think that?s because some processes are still running when I erase and 
programm the flash (mtdblock3) ?

So how could I update my RFS at runtime ?

Thank you