Erwin Van de Velde wrote:
> I have 802.11n cards with an atheros chipset with no default country domain.
> Upon initialization, crda is set to US domain, after which I try to change it
> to another domain, the driver only accepts further limitations: i.e. if a
> channel is allowed in the US but not in Belgium, it is disabled, but the other
> way round: if a channel is not allowed in the US, but is allowed in Belgium it
> is not enabled.
"no default country domain" :-???
# dmesg | grep ath:
look for:
ath: EEPROM regdomain: XXX
ath: EEPROM indicates we should expect a direct regpair map
ath: Country alpha2 being used: XX
ath: Regpair used: XXX
This is a Atheros *driver* feature.
Channels are restricted based on the EEPROM value.
And crda/wireless-regdb only can makes things _worse_.
Solutions:
- modify the driver
- reprogramming of the EEPROM
- buy another board and keep away from Atheros chipsets
You should read:
http://wireless.kernel.org/en/users/Drivers/ath#Regulatory
http://marc.info/?l=linux-wireless&m=125072768530674
http://marc.info/?l=linux-wireless&m=125078520924477
http://wiki.openwrt.org/doc/howto/wireless.utilities?s[]=regulatory#iw see "Note:"
In linux source code, see regd* files:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=tree;f=drivers/net/wireless/ath
On Sunday 17 June 2012 20:16:21 Xose Vazquez Perez wrote:
> Erwin Van de Velde wrote:
> > I have 802.11n cards with an atheros chipset with no default country
> > domain. Upon initialization, crda is set to US domain, after which I try
> > to change it to another domain, the driver only accepts further
> > limitations: i.e. if a channel is allowed in the US but not in Belgium,
> > it is disabled, but the other way round: if a channel is not allowed in
> > the US, but is allowed in Belgium it is not enabled.
>
> "no default country domain" :-???
>
> # dmesg | grep ath:
>
> look for:
> ath: EEPROM regdomain: XXX
> ath: EEPROM indicates we should expect a direct regpair map
> ath: Country alpha2 being used: XX
> ath: Regpair used: XXX
>
>
> This is a Atheros *driver* feature.
> Channels are restricted based on the EEPROM value.
> And crda/wireless-regdb only can makes things _worse_.
The output I get is:
[ 8.931463] ath: EEPROM regdomain: 0x0
[ 8.931483] ath: EEPROM indicates default country code should be used
[ 8.931502] ath: doing EEPROM country->regdmn map search
[ 8.931526] ath: country maps to regdmn code: 0x3a
[ 8.931544] ath: Country alpha2 being used: US
[ 8.931561] ath: Regpair used: 0x3a
As I see it, the regdomain is 00 and not US, so why does the ath9k driver
decide to put me in the US? US should not be the default country code, but
world reg domain. The preferred solution in my opinion is that the driver
would require a regdomain to be given if it is not already set by the card.
Choosing US as a default seems purely random . It would make far more sense to
have no restricions by default if no regdomain is given and require it as a
parameter, so everyone can set it correctly to his correct domain. The current
method not only disallows valid channels to be used, but can also allow for
legally forbidden channels to be used, which could be even worse.
Regards,
Erwin