The wireless chipset itself is supported by 3rd party firmwares from Acorp and now also RouterTech (the beta), so it should not be a problem under normal circumstances to get a working firmware for it. The real question is whether your router's ethernet switch is supported. RT and Acorp fully support the Marvell switch. The Realtek RTL8305SC switch is not supported at all (i.e., the ethernet ports will not work, although wireless and USB will work). Other switches may or may not work. So if you know that your router has a Marvell switch, then you can afford to be brave. Otherwise, I would recommend cowardice.
Here is a sample led.conf from a router using this new wireless chipset.
/var # cat /etc/led.conf
#################################################################
# Configuration File for AR7RD board
##################################################################
##################################################################
# The GPIO numbers 0 to 31 ==> correspond to GPIO pins #########
# The GPIO numbers 32,33 are mapped to ADSL (LED) pins ###########
##################################################################
module = pwr # module = {adsl,usb,pppoe,wlan}
state = 1 # 0 = link down, 1 = link up
gpio = 7 # gpio number
mode = 1 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
module = adsl # module = {adsl,usb,pppoe}
##################################################################
# Note: state 0 for adsl is dummy state and is present only for ##
# compatibility with the new LED driver ##
##################################################################
state = 0 # 0=dummy, 1=idle, 2=training, 3=sync, 4=activity
gpio = LED1 # gpio number
mode = 0 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
state = 1 # 0=dummy, 1=idle, 2=training, 3=sync, 4=activity
gpio = LED1 # gpio number
mode = 1 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
state = 2 # 0=dummy, 1=idle, 2=training, 3=sync, 4=activity
gpio = LED1 # gpio number
mode = 4 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
param1 = 200 # flash on duration in ms
param2 = 200 # flash off duration in ms
state = 3 # 0=dummy, 1=idle, 2=training, 3=sync, 4=activity
gpio = LED1 # gpio number
mode = 0 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
state = 4 # 0=dummy, 1=idle, 2=training, 3=sync, 4=activity
gpio = LED1 # gpio number
mode = 0 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
######################################################################
######################################################################
module = usb # module = {adsl,usb,pppoe,wlan}
state = 0 # 0 = link down, 1 = link up, 2 = pkt rcv, 3 = pkt xmit
gpio = 12 # gpio number
mode = 0 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
state = 1 # 0 = link down, 1 = link up, 2 = pkt rcv, 3 = pkt xmit
gpio = 12 # gpio number
mode = 1 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
state = 2 # 0 = link down, 1 = link up, 2 = pkt rcv, 3 = pkt xmit
gpio = 12 # gpio number
mode = 2 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
param1 = 100 # blink/flash rate in ms
state = 3 # 0 = link down, 1 = link up, 2 = pkt rcv, 3 = pkt xmit
gpio = 12 # gpio number
mode = 2 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
param1 = 100 # blink/flash rate in ms
######################################################################
module = pppoe # module = {adsl,usb,pppoe,wlan}
state = 0 # 0 = pppoe down, 1 = pppoe active
gpio = 13 # gpio number
mode = 0 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
state = 1 # 0 = pppoe down, 1 = pppoe active
gpio = 13 # gpio number
mode = 1 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
######################################################################
module = wlan # module = {adsl,usb,pppoe,wlan}
state = 0 # 0 = link down, 1 = link up
gpio = 6 # gpio number
mode = 0 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
state = 1 # 0 = link down, 1 = link up
gpio = 6 # gpio number
mode = 1 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
state = 2 # 0 = link down, 1 = link up, 2 = pkt rcv, 3 = pkt xmit
gpio = 6 # gpio number
mode = 2 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
param1 = 100 # blink/flash rate in ms
state = 3 # 0 = link down, 1 = link up, 2 = pkt rcv, 3 = pkt xmit
gpio = 6 # gpio number
mode = 2 # 0 = off,1 = on,2 = blinkoff,3 = blinkon, 4 = Flash
param1 = 100 # blink/flash rate in ms
/var #