What do you have to chaning in the kernel config file so you can have say 64:0 on the Z.
You need to configure the command line options prior to build the kernel, i.e. set the default kernel config under the General Settings.
root=/dev/mtdblock0 mem=64m
you\'ll also need to have a filesystem that copes with this configuration, look at the /root/etc/rc.d/rc.rofilesys in the Crow initrd for the basic idea.