I don't know if this is documented somewhere else.
I booted over NFS, by entering the following into the serial boot
console (it still uses kernel in flash):
setenv bootargs_nfs root=/dev/nfs nfsroot=192.168.0.200:/export/openmoko
ip=192.168.0.202:192.168.0.200:192.168.0.200:255.255.255.0:ezx:usb0:off
rootdelay=5 console=ttySAC0,115200 console=tty0 loglevel=8
setenv menu_5 Boot from NFS: setenv bootargs \${bootargs_nfs}
\${mtdparts} \; nand read.e 0x32000000 kernel\; bootm 0x32000000
saveenv
I suppose if it is not in the wiki, I could put it there.
