On Thu, May 6, 2010 at 1:36 PM, Alexander Egorenkov <egore...@gmail.com> wrote:
> Am 29.04.2010 22:15, schrieb Benoit PAPILLAULT:
>> Robert Meschke a écrit :
>>> Hi,
>>>
>>> thank you for your immediate response, Luis. It's a pity that DFS is not
>>> supposed to work in the near future. A can provide more specific
>>> information. I am working on a project, where I really need the 5 Ghz band
>>> and have to respect national laws.
>>> I am using Ubiquiti Networks SR71-A MIMO mini pci radios, based on the
>>> Atheros AR 9160 bb/mac chip and AR5133 RF chip. I am really willing to
>>> implement DFS if it is somehow possible for me.
>>> Former in this thread it was mentioned that Radar Pulse Detection is done
>>> by hardware itself and is supported by madwifi. I've checked the
>>> madwifi-hal and the one of Sam Leffler for Radar Detection stuff. The
>>> AR9160 is declared as compatible with AR5416 in the ah_devid.h:
>>>
>>> /* AR5416 compatible devid's */
>>> #define AR5416_DEVID_PCI 0x0023 /* AR5416 PCI (MB/CB) Owl */
>>> #define AR5416_DEVID_PCIE 0x0024 /* AR5416 PCI-E (XB) Owl */
>>> #define AR9160_DEVID_PCI 0x0027 /* AR9160 PCI Sowl */
>>> #define AR9280_DEVID_PCI 0x0029 /* AR9280 PCI Merlin */
>>> #define AR9280_DEVID_PCIE 0x002a /* AR9280 PCI-E Merlin */
>>> #define AR9285_DEVID_PCIE 0x002b /* AR9285 PCI-E Kite */
>>>
>>> Register adresses for Radar Detection are defined for AR5211+ in
>>> if_ath_radar.h. In the if_ath_radar.c this can be found:
>>>
>>> if (ar_device(sc)>= 5211) {
>>>
>>> ...
>>>
>>> }
>>>
>>> It implies to me that Radar Detection performed by the madwifi Driver could
>>> possibly work for AR5416 (and therefore for AR9160, too).
>>>
>>> It has to be mentioned that there are register adress definitions for Radar
>>> Detection in the hal of Sam Leffler but only for AR5211 and AR5212 and I've
>>> read in forum that the AR5416 does not have Radar Detection caps.
>>>
>>> Are the hardware interfaces for Radar Detection of AR9160 and AR5211/12 the
>>> same and is there any chance for madwifi code to work for ath9k too (after
>>> necessary modifications)?
>>>
>>> Have anybody else information on this topic? I have access to signal
>>> generators an spectrum analysers, so I could verify compliance with DFS but
>>> I need the exact hardware specifications.
>>> Thanks in advance.
>>>
>> Hi Robert,
>>
>> If you have access to signal generators, I would suggest a very simple
>> and easy start : try to add the code to detect pulse like it was done in
>> madwifi-dfs (ported to madwifi/trunk BTW). Then, just send few pulses
>> and you'll see if you AR9160 based card will detect it. This is how I
>> did when writing madwifi-dfs... a long time ago :-).
>>
>> Maybe 802.11n hardware has some stuff specific to radar detection since
>> it probably needs to distinguish between primary& secondary channel. Is
>> there someone (Luis?) that can confirm?
>>
>> Regards,
>> Benoit
>
> And AR9160 definetly supports DFS :-) Because it's a chipset for AP and
> routers for 2.4 and 5 GHZ band :-)
> See http://www.atheros.com/news/AR9001.htm
DFS requires some software implemented which is not upstream, we are
reviewing this possibility now.
Luis
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