Re: [Madwifi-devel] Help required in understandingMadWifiinitialization and card setup

You might also want to take a look here:

http://madwifi-project.org/ticket/2316

Using hal-testing  r4068 we were able to get 1/2 and 1/4 channel capability 
on 900Mhz and 4.9Ghz by setting the countrycodes to 843 and 842 
respectively. This did NOT work on trunk, however, as of about 9 months ago. 
I don't know whether whatever made it work on hal-testing has been ported to 
trunk in the meanwhile.

Tom S.

----- Original Message ----- 
From: "Brett Wright" <[email protected]>
To: "Aditya Bhave" <[email protected]>; 
<[email protected]>; <[email protected]>
Sent: Tuesday, June 01, 2010 7:29 PM
Subject: Re: [Madwifi-devel] Help required in 
understandingMadWifiinitialization and card setup


> Hi,
>
> You need to set a reg domain that supports half and quarter channels
> (you may have to add/modify to get the functionality you want).
> Have a look at struct regDomain in ah_regdomain.c
> In particular the parameters chan11g_quarter, chanllg_half, etc.
> The reg domain you are using will have to assign an appropriate
> REG_DMN_FREQ_BAND to these parameters with corresponding channelBW set.
>
> Once these half/quarter channels exist for your regdomain, they are
> differentiated by appropriate bits of the channelFlags parameter of an
> ieee80211_channel structure - take a look at ath_getchannels() in
> if_ath.c to get a good idea where the channel structures are set and
> what they contain. Ultimately, these are the channels/bandwidths that
> you can then specify.
>
> Brett
>
>> -----Original Message-----
>> From: Aditya Bhave [mailto:[email protected]]
>> Sent: Wednesday, 2 June 2010 12:07 PM
>> To: [email protected]; madwifi-
>> [email protected]
>> Subject: [Madwifi-devel] Help required in understanding
>> MadWifiinitialization and card setup
>>
>> Hi,
>>
>> I needed some help in understanding what happens during MadWifi
>> initialization? What functions get called and in what order? Which
>> function initializes the card through the HAL and so on. Specifically,
>> Im looking to implement 5/10 MHz channel widths on Madwifi and I know
>> that this requires modifying parts of the ath_reset() and ath_init()
>> methods as well as adding regulatory support in ah_regdomain.c. Can
>> someone please guide me on this? Specifically,
>>
>> 1. How does the driver know which channels are supported by the card?
>> Which HAL functions does it call and what data structures represent
>> channels?
>> 2. How and where does the driver tell the card to use a specific
> channel
>> center frequency and width?
>>
>> Many thanks for your help
>> --Aditya Bhave
>>
>>
> ------------------------------------------------------------------------
> --
>> ----
>>
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>> [email protected]
>> https://lists.sourceforge.net/lists/listinfo/madwifi-devel
>>
>>
>>
>
>
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>
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