Re: VFS: Cannot open root device "31:03" or unknown-block(31,3)

in your .config:

quoted

CONFIG_JFFS2_FS=m

This is wrong. You have to choose "y", not "m" (for module).
This way jffs2 is compiled as a module. That means, that jffs2 filesystem 
will
not be available until the module is loaded with "insmod jffs2" of 
something
similar. That in turn means that your system has to start up first in 
order
to be able to do this, but since you can't start because your root 
filesystem
is on jffs2, you have created yourself a "chicken and egg" problem.
If you choose "y" then jffs2 support will be compiled into the kernel, and
thus be available before booting.

Hi, David,
  Yes, you are right. After changing it to 'y', the " VFS: Cannot open 
root..."
message was gone. I'm so happy and thank you very much.

  Now it is another problem again. (something like: Oops: kernel access of 
bad
area. sig:11...).  I am going to check what happened.

In your bootlog:

quoted

Linux version 2.6.14.2 (happy@sddlinux1) (gcc version 3.3.3 (DENX ELDK 
3.1.1
3.3.3-10)) #29 Sun Jan 1 22:34:28 CST 2006
Motorola SPS Sandpoint Test Platform

I see you are using DENX ELDK 3.1.1 and a kernel which AFAIK is not 
supported
by this version of ELDK. Are you sure this is supposed to work? It 
probably
will, but I don't know what the "Sandpoint" is (it looks like a PowerPC
processor of the MPC7xx series to me), so I couldn't tell.

  Do you know where to get the infomation about which kernel version it 
supports?

thank you,
/HappyPhot