i have backported changes in wifi-driver to 5.10 and 5.4 as it seems to work stable like builtin and fixes hang-bug if wlan0 is aquired by another wifi-card
Very cool 
I canāt test those currently as the router is now deployed.
Thank you again for all the work you put in!
Result:
5.12 is not for productive use (and still release candidate) you should switch to 5.10 or 5.4. If you need hnat,you can try 5.10-hnat tree but i have not added the wifi patches to it,but you can cherry-pick them from 5.10-main
Tried to follow along with this thread, but I canāt for some reason. Is this problem/issue solved?
5.12-rc (+hnat),5.10-main and 5.4-main support building internal wifi as module,so cfg80211 can be built as module too and loaded with regdomain option
So it should be fixed,yes
Iām not sure you fall into it as i can set regdomain with iw in debian (maybe same in ubuntu). Without having cfg80211 or mt6625l as module.
With all due respect intended, I wouldnāt ask the question if I wasnāt having the problem.
However, I figured it out. Changing my kernel options to make cfg80211 a module, pulling the https://kernel.googlesource.com/pub/scm/linux/kernel/git/sforshee/wireless-regdb repository for the wireless regulatory database, properly linking those files, and including those options in the modprobe.d directory seems to have fixed my issueā¦
You had the same reg domain 00 issue? Which system (image) and countrycode do you have? With debian and DE i had no problem with regulatory domain (after installing needed packages) with builtin cfg80211
Yeah, Iām using your Debian 10 image with kernel 5.10.23, with US country code.
I know, Iām a bunch of problems, arenāt I? 
Lol no,but i wonder why i can set DE without problems and you not US regdomain
From all my reading about this I came to the following results:
āiw reg setā actually calls ācrdaā to set the regdom, so if crda is not present it wonāt set it.
crda is a deprecated method and is basically only āaliveā because it hasnāt been fully patched out of the kernel yet.
The ānewā way to set the regdom should be done with the cfg80211 module i.e. at the kernel level.
Thatās why I was very glad to see that you helped all the way, wouldnāt know what I would have done without you .
I had the requirements installed (being iw, wireless-regdb, and crda), as outlined by your wiki installed. For some reason, it didnāt work for me. I even went so far as to install wireless-regdb from buster-backports, which provided me with a more up-to-date regulatory database than the one in the buster repoā¦ It was a no-go until I posted in this thread. Thanks, Frank and Eldes!
@ frank-w : For sh!ts and giggles, I tried DE before posting in this thread. Was a no-go as wellā¦
Mhm, i donāt see IR on main router running 5.4.107,but i see DE regdom and have 5g hostap running (currently connected,ch40 5200mhz)
[08:26] root@bpi-r2-emmc:~ (501)
# iw reg get
global
country DE: DFS-ETSI
(2400 - 2483 @ 40), (N/A, 20), (N/A)
(5150 - 5250 @ 80), (N/A, 20), (N/A), NO-OUTDOOR, AUTO-BW
(5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
(5470 - 5725 @ 160), (N/A, 26), (0 ms), DFS
(5725 - 5875 @ 80), (N/A, 13), (N/A)
(57000 - 66000 @ 2160), (N/A, 40), (N/A)
[08:26] root@bpi-r2-emmc:~ (502)
#The āno-IRā flag for the 5Ghz spectrum will be there if the ā00ā (or āworldā) regdom or is set.
Oh and I also forgot to mention something that is actually important:
The regdom has to be set before Wifi drivers are loaded, that seems to be rarely mentioned.
So there is only āNO-IRā if non working,but no āIRā if it is workingā¦
Need to update wifi-script and wiki before changing defconfig to module
I donāt know if weāre talking about the same thing here:
The āno IRā flag is shown in āiw listā like so:
2472 MHz [13] (20.0 dBm) (no IR)
If ā00ā is set then you get, with āiw reg getā, this:
country 00: DFS-UNSET
(2402 - 2472 @ 40), (6, 20), (N/A)
(2457 - 2482 @ 20), (6, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(2474 - 2494 @ 20), (6, 20), (N/A), NO-OFDM, PASSIVE-SCAN
(5170 - 5250 @ 80), (6, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(5250 - 5330 @ 80), (6, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN
(5490 - 5730 @ 160), (6, 20), (0 ms), DFS, PASSIVE-SCAN
(5735 - 5835 @ 80), (6, 20), (N/A), PASSIVE-SCAN
(57240 - 63720 @ 2160), (N/A, 0), (N/A)
All channels that work are looking like this, with nothing behind them:
2452 MHz [9] (20.0 dBm)
Depending on what regdom is loaded however some channels may be disabled, āiw listā:
2484 MHz [14] (disabled)
In this example channel 14 is only available with the regdom āJPā(Japan).
Iām showing all this on the 2.4GHz as I have that on hand currently but the same is true for 5GHz.
As for this:
5500 MHz [100] (26.0 dBm) (radar detection)
This needs the āDFSā feature to work in the driver to use that channel, many drivers seem to not really support it though.
āDFSā is used in hostapd with the āacsā settings and channel either left out or set to ā0ā, meaning hostapd will select a channel automatically after scanning the environment to check if there is anything broadcasting on those frequencies.
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ok, looked onto my main-router it show this for mt7612e/5G band (imho hard to get phy to right device):
Frequencies:
* 5180 MHz [36] (18.0 dBm)
* 5200 MHz [40] (18.0 dBm)
* 5220 MHz [44] (18.0 dBm)
* 5240 MHz [48] (18.0 dBm)
* 5260 MHz [52] (18.0 dBm) (radar detection)
* 5280 MHz [56] (18.0 dBm) (radar detection)
* 5300 MHz [60] (18.0 dBm) (radar detection)
* 5320 MHz [64] (18.0 dBm) (radar detection)
* 5500 MHz [100] (17.0 dBm) (radar detection)
* 5520 MHz [104] (17.0 dBm) (radar detection)
* 5540 MHz [108] (17.0 dBm) (radar detection)
* 5560 MHz [112] (17.0 dBm) (radar detection)
* 5580 MHz [116] (16.0 dBm) (radar detection)
* 5600 MHz [120] (16.0 dBm) (radar detection)
* 5620 MHz [124] (16.0 dBm) (radar detection)
* 5640 MHz [128] (16.0 dBm) (radar detection)
* 5660 MHz [132] (16.0 dBm) (radar detection)
* 5680 MHz [136] (16.0 dBm) (radar detection)
* 5700 MHz [140] (16.0 dBm) (radar detection)
* 5745 MHz [149] (13.0 dBm)
* 5765 MHz [153] (13.0 dBm)
* 5785 MHz [157] (13.0 dBm)
* 5805 MHz [161] (13.0 dBm)
* 5825 MHz [165] (13.0 dBm)
still wondering why it works in my case (5.4.107-bpi-r2-main) without having cfg80211 as module. i have modprobe-config set, but this should not be read
# cat /etc/modprobe.d/cfg80211.conf
options cfg80211 ieee80211_regdom=DE
but tried module approach on my test-device and ap0 is up and running. only added
modprobe wlan_gen2
before check for /dev/wmtWifi in my wifi.sh (wmt_chrdev_wifi is loaded automaticly), but iām thinking about checking for
/lib/modules/$(uname -r)/kernel/drivers/misc/mediatek/connectivity/wlan/gen2/wlan_gen2.ko
before trying to load itā¦just to avoid modprobe-error if wifi-driver is built-in
cfg80211.ko is loaded at boottime because i have mt7615 active 
have pushed changes to 5.10-main, will do for 5.4-main if no problems will come
You may have an udev rule that is doing what needs to be done.
For which part do you suggest an udev rule?
Have added modprobe to wifi.sh like this:
You may have an udev rule in your system for crda.
This talks about it:
https://wireless.wiki.kernel.org/en/developers/regulatory/crda
Neat, I may have to adopt that part to my script At one pointā¦
Not yet,but found country_code=DE option in my hostapd.conf for 5g, looked on my test-device also no udev-rules, but the config in modprobe.d is also there (no cfg80211 module).
booted older kernel on my test-device without cfg80211 module
root@bpi-r2:~# iw reg get
global
country 00: DFS-UNSET
(2402 - 2472 @ 40), (N/A, 20), (N/A)
(2457 - 2482 @ 20), (N/A, 20), (N/A), AUTO-BW, NO-IR
(2474 - 2494 @ 20), (N/A, 20), (N/A), NO-OFDM, NO-IR
(5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW, NO-IR
(5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW, NO-IR
(5490 - 5730 @ 160), (N/A, 20), (0 ms), DFS, NO-IR
(5735 - 5835 @ 80), (N/A, 20), (N/A), NO-IR
(57240 - 63720 @ 2160), (N/A, 0), (N/A)
root@bpi-r2:~# iw reg set DE
root@bpi-r2:~# iw reg get
global
country DE: DFS-ETSI
(2400 - 2483 @ 40), (N/A, 20), (N/A)
(5150 - 5250 @ 80), (N/A, 20), (N/A), NO-OUTDOOR, AUTO-BW
(5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
(5470 - 5725 @ 160), (N/A, 26), (0 ms), DFS
(5725 - 5875 @ 80), (N/A, 13), (N/A)
(57000 - 66000 @ 2160), (N/A, 40), (N/A)
root@bpi-r2:~#
root@bpi-r2:~# apt list --installed | grep "crda\|iw\|reg"
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
crda/stable,now 3.18-1 armhf [installed]
iw/stable,now 5.0.1-1 armhf [installed]
libiw30/stable,now 30~pre9-13 armhf [installed,automatic]
wireless-regdb/stable,now 2016.06.10-1 all [installed]
root@bpi-r2:~#