Re: Help required in understandingMadWifiinitialization and card setup

> -----Original Message-----
> From: Aditya Bhave [mailto:[email protected]]
> Sent: Thursday, 3 June 2010 2:34 PM
> To: Tom Sharples
> Cc: Brett Wright; [email protected]; madwifi-
> [email protected]
> Subject: Re: [Madwifi-devel] Help required in
> understandingMadWifiinitialization and card setup
> 
> Thanks very much for both your replies. I had a few comments
> 
> 1. I looked in ah_regdomain.c There I see the following code fragments
> /* FCC1 w/ 1/2 and 1/4 width channels */
>      {.regDmnEnum        = FCC5,
>       .conformanceTestLimit    = FCC,
>       .chan11a        = BM3(F2_5180_5240, F4_5260_5320, F5_5745_5825),
>       .chan11a_turbo        = BM3(T1_5210_5210, T2_5250_5290,
> T2_5760_5800),
>       .chan11a_dyn_turbo    = BM3(T1_5200_5240, T1_5280_5280,
> T1_5765_5805),
>       .chan11a_half        = BM3(F7_5180_5240, F7_5260_5320,
> F9_5745_5825),
>       .chan11a_quarter    = BM3(F8_5180_5240,
F8_5260_5320,F10_5745_5825),
>      },
> 
> and
> FCC5              = 0x0166,         /* US w/ 1/2 and 1/4 width
channels */
> 
> so it seems what Brett suggested has already been added to the code.
> Only thing missing is the relationship with REG_DMN_FREQ_BAND. How do
I
> associate that data structure with the two above?

Looking at .chan11a_quarter above, if you look at the definition of
F8_5180_5240 you will see that the channelBW = 5, which is what we want
for quarter channel. So that is taken care of for this case.

> 
> 2. I looked into ath_getchannels(). It seems that this function calls
> ath_hal_init_channels() with an empty array of channels 'chans' and
the
> ath_hal_init_channels() fills it up. I added some printk's inside this
> function to see what the default country code was and what channels
were
> being assigned to the array. But for some reason, those printk's never
> print out in /var/log/kern.log (Other printks I inserted into other
> parts of code show up here though).
> 
> For example in ah_regdomain.c, I added a simple printk as below
> HAL_BOOL
> ath_hal_init_channels(struct ath_hal *ah,
>                HAL_CHANNEL *chans, u_int maxchans, u_int *nchans,
>                uint8_t *regclassids, u_int maxregids, u_int *nregids,
>                HAL_CTRY_CODE cc, u_int modeSelect,
>                HAL_BOOL enableOutdoor, HAL_BOOL
enableExtendedChannels)
> {
> #define CHANNEL_HALF_BW        10
> #define CHANNEL_QUARTER_BW    5
>      u_int modesAvail;
>      uint16_t maxChan;
>      COUNTRY_CODE_TO_ENUM_RD *country = AH_NULL;
>      REG_DOMAIN rd5GHz, rd2GHz;
>      const struct cmode *cm;
>      HAL_CHANNEL_INTERNAL *ichans = &AH_PRIVATE(ah)->ah_channels[0];
>      int next, b;
>      uint8_t ctl;
> 
>      // AYB
>      printk(KERN_ALERT "Here\n");
>      // AYB
> 
> but it never shows up.
> 
> Can someone please tell me what the default country code is and how I
> can change it to allow 5/10 MHz channels?

Try change the country code and that should force call to
ath_getchannels().
Something like:

echo country_code > /proc/sys/dev/wifi0/countrycode

where country_code is of course the numerical country code you want.

> 
> Thanks
> 
> 
 


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