#directions from http://wiki.openwrt.org/OpenWrtDocs/Hardware/Fon/Fonera


router should:
 - have boot_wait enabled
 - ip address: 192.168.5.22
 - netmask: 255.255.255.0
 - gateway: (empty)
 - default server: 192.168.5.2


#on your linux box
install tftp-server
edit /etc/xinetd.d/tftp and enable tftp
put kernel & root fs in /var/lib/tftpboot
disable firewall and start xinetd
set local IP to 192.168.5.2

#as root on linux box
arping -f 192.168.5.22 ; echo -e "\0377\0364\0377\0375\0006" | nc -vvv 192.168.5.22 9000 ; telnet 192.168.5.22 9000

#on router (in telnet session)
load -r -b %{FREEMEMLO} openwrt-atheros-2.6-vmlinux.lzma
fis init
fis create -e 0x80041000 -r 0x80041000 vmlinux.bin.l7
load -r -b %{FREEMEMLO} openwrt-atheros-2.6-root.squashfs
fis create -l 0x006F0000 rootfs
reset


router will come up with ip 192.168.1.1
telnet in and set your root password
this will disable telnet and enable ssh on next reboot
to use SSH before you reboot, you need to start it
/etc/init.d/dropbear start
note: you won't be able to ssh in for at least 30 seconds
note: it is generating host keys, so just be patient

setup a configuration restoration system in case you break something:
-----BEGIN CUT-AND-PASTE-----

cat >/etc/init.d/safetynet <<EOF
#!/bin/sh /etc/rc.common
# Copyright (C) 2006 OpenWrt.org

START=35

boot() {
        if [ -f /safetynet.doit ]
        then
		rm -f /etc/config && \
		ln -s /etc/config.bak /etc/config && \
		rm /safetynet.doit
	fi
	
	if [ -f /safetynet ]
	then
		mv /safetynet /safetynet.doit
	fi
}
EOF

chmod +x /etc/init.d/safetynet
/etc/init.d/safetynet enable
touch /safetynet
mv /etc/config /etc/config.bak
mkdir /etc/config.new
cp /etc/config.bak/* /etc/config.new/
ln -s /etc/config.new /etc/config

-----END CUT-AND-PASTE-----

now, anytime you are changing the config, touch /safetynet
when you reboot, if everything is working correctly, rm /safetynet.doit
otherwise, let it boot completely, hard reboot again, and it will link
/etc/config to /etc/config.bak
after correcting, you can try again by recreating the link to config.new
ln -s /etc/config.new /etc/config