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Subject: Re: [wireless-regdb] [PATCH] wireless-regdb: Update regulatory
 rules for Brazil (BR)
From:   Johannes Berg <johannes@sipsolutions.net>
To:     Cesar Eduardo Barros <cesarb@cesarb.eti.br>,
        Seth Forshee <sforshee@kernel.org>
Cc:     wireless-regdb@lists.infradead.org, linux-wireless@vger.kernel.org
Date:   Sat, 10 Sep 2022 16:33:48 +0200
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On Fri, 2022-09-09 at 19:29 -0300, Cesar Eduardo Barros wrote:
>=20
>  From my quick look, it seems that it would set a NO-160MHZ flag in the=
=20
> rule, which would then propagate to each 20MHz sub-channel, and probably=
=20
> would lead to it rejecting the use of the whole as a 160MHz channel; but=
=20
> there's also the 80+80 mode, which would still be allowed (and I vaguely=
=20
> recall seeing somewhere that adjacent 80+80 was prefered over 160 for=20
> some reason).

Much hardware doesn't support it though. I guess it might be easier to
do separate CCA in that case? Dunno.

Anyway.

> Unfortunately, I don't have any hardware which can use 160MHz channels;=
=20
> it's only last month that I upgraded my AP to one which can use 80MHz=20
> channels (which is what led me to looking into all this stuff).
>=20

Really what I wanted to say is that you should be able to compile a
kernel with e.g. ARCH=3Dum per the instructions at

https://w1.fi/cgit/hostap/tree/tests/hwsim/vm/README

and then test it all in "userspace" with hwsim in the userspace kernel.

johannes