In case you have challenges in setting up DHCP or want to set static IP address for AP during AP bootup you can use the below procedure (press enter when it counts 3,2,1 during boot up):
apboot>
setenv ipaddr 172.16.3.223
This Comand will set the static ip address to AP
setenv netmask 255.255.255.0
This command will set the subnet mask to the AP
setenv gatewayip 172.16.3.1
This command will set the ip default gateway to the AP
setenv master 172.20.5.25
This command will tell the ip which is the master controller
save
This command is to save this setting across AP boot
printenv
This command is to see what has been set.
boot
This command is to continue booting the AP
In this case AP will not timeout for non-availability of IP address with DHCP. (Static IP take precedence over DHCP)