[OpenWrt-Devel] [PATCH] ar71xx: add support for the UniFi AP Outdoor Plus

Stefan Rompf stefan at loplof.de
Sat Mar 21 05:16:48 EDT 2015

Hi Sergey,

> You should be a wizard to reveal hw protocol without touching hw :)

I cannot say 'Mischief managed!' by now, but it's slowly making progress ;-)

> Unlikely that iwconfig changes something directly, I would bet on the
> driver.

Indeed. So far

-The RF filter is controlled by the GPIO pins on the AR928x wifi chip via some 
kind of serial protocol.
-The functions responsible for the filter are ath_hal_hsr_init(), called once 
on initialisation, ath_hal_hsr_disable() and ath_hal_hsr_enable() on channel 
change. There is an ath_hal_hsr_get_lock_status() that does not seem to be 
-There seems to be no filter tuning after it has been setup on channel change.

Reverse engineering this unreadable MIPS assembly mess will take some time... 
anyone willing to help? Does it make sense to open a ticket to track the issue 
or is this mailing list ok?

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