[meta-freescale] Calling CRDA to update world regulatory domain

[Otavio Salvador]

On Sat, Jul 18, 2015 at 12:28 PM, Fabio Estevam <festevam at gmail.com> wrote:
> When running kernel 4.1.2 provided by linux-fslc on imx6sl-warp the
> following messages are seen:
>
> cfg80211: Calling CRDA to update world regulatory domain
> cfg80211: Calling CRDA to update world regulatory domain
> cfg80211: Calling CRDA to update world regulatory domain
> cfg80211: Calling CRDA to update world regulatory domain
>
> and it stops after several retries.
>
> According to Documentation/networking/regulatory.txt:
>
> "How to get regulatory domains to the kernel
> -------------------------------------------
>
> Userspace gets a regulatory domain in the kernel by having
> a userspace agent build it and send it via nl80211. Only
> expected regulatory domains will be respected by the kernel.
>
> A currently available userspace agent which can accomplish this
> is CRDA - central regulatory domain agent. Its documented here:
>
> http://wireless.kernel.org/en/developers/Regulatory/CRDA
>
> Essentially the kernel will send a udev event when it knows
> it needs a new regulatory domain. A udev rule can be put in place
> to trigger crda to send the respective regulatory domain for a
> specific ISO/IEC 3166 alpha2.
>
> Below is an example udev rule which can be used:
>
> # Example file, should be put in /etc/udev/rules.d/regulatory.rules
> KERNEL=="regulatory*", ACTION=="change", SUBSYSTEM=="platform",
> RUN+="/sbin/crda"
>
> The alpha2 is passed as an environment variable under the variable COUNTRY."
>
> So I am wondering how is the proper way to add such udev rule to
> meta-fsl-arm so that we can get rid of these annoying messages? Or
> should it be done in oe?

It should be part of crda recipe itself so the package includes it.

This seems to be done already[1] so it is a matter of including this
in the image which has WIFI support.

1. http://cgit.openembedded.org/cgit.cgi/meta-openembedded/tree/meta-networking/recipes-connectivity/crda/crda_3.13.bb?h=master

-- 
Otavio Salvador                             O.S. Systems
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