Wireless config missing in RB951Ui-2HnD

[codemarauder]

It seems something has changed in the hardware. I have "Type: INTL"
devices here.

I have already tried the following firmwares:

1. custom compiled 19.07.0
2. openwrt 19.07.0
3. custom compiled 18.06.2
4. custom compiled 17.02.4

I have tried these firmware on multiple (5+) old and new devices.

On newer hardware, wifi config only touches the /etc/config/wireless and
there is no configuration inside.

Below is the output on older hardware with 17.02.4, which has wifi working:

root@HBCC2DE061D01A:~# iw dev wlan0 info
Interface wlan0
        ifindex 6
        wdev 0x1
        addr cc:2d:e0:61:d0:25
        type managed
        wiphy 0
        txpower 20.00 dBm

root@HBCC2DE061D01A:~# dmesg | grep ath
[   22.885162] ath: EEPROM regdomain: 0x0
[   22.885182] ath: EEPROM indicates default country code should be used
[   22.885191] ath: doing EEPROM country->regdmn map search
[   22.885212] ath: country maps to regdmn code: 0x3a
[   22.885224] ath: Country alpha2 being used: US
[   22.885233] ath: Regpair used: 0x3a

root@HBCC2DE061D01A:/sys/devices/platform# ls -1
ag71xx-mdio.1
ag71xx.0
ag71xx.1
alarmtimer
ar934x-nfc
ar934x_wmac
ath79-gpio
ath79-wdt
ehci-platform
leds-gpio
regulatory.0
serial8250
serial8250.0
uevent

And below is the output on new hardware with 17.02.4:

root@OpenWrt:~# iw dev wlan0 info
command failed: No such device (-19)

root@OpenWrt:~# dmesg | grep ath
root@OpenWrt:~#

root@OpenWrt:/sys/devices/platform# ls -1
ag71xx-mdio.1
ag71xx.0
ag71xx.1
alarmtimer
ar934x-nfc
ath79-gpio
ath79-wdt
ehci-platform
leds-gpio
regulatory.0
serial8250
serial8250.0
uevent

Unloading or loading ath9k module adds following line to dmesg:

root@OpenWrt:~# dmesg | grep ath
[ 1175.108742] ath9k: ath9k: Driver unloaded

The above behaviour is same with 19.07.0 on the new hardware.

I do not see ar934x_wmac in /sys/devices/platform on new hardware, but
it is present on older hardware.

Does anyone has a clue about what could be going on?

I have access to both the types of numerous devices, so I can provide
further debugging information as and when required.

Thanks in advance.

[codemarauder]

Bug Report already filed on Fly Spray.

MAC address of my device starts from 74:4D:28 as well.

# cat /proc/cpuinfo

Machine                 : MikroTik RouterBOARD 951Ui-2HnD
processor               : 0
cpu model               : MIPS 74Kc V4.12
BogoMIPS                : 299.82
wait instruction        : yes
microsecond timers      : yes
tlb_entries             : 32
extra interrupt vector  : yes
hardware watchpoint     : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb]
isa                     : mips1 mips2 mips32r1 mips32r2
ASEs implemented        : mips16 dsp dsp2
shadow register sets    : 1
kscratch registers      : 0
package                 : 0
core                    : 0
VCED exceptions         : not available
VCEI exceptions         : not available

Pertinent line from dmesg:

[    0.000000] Kernel command line: benand_no_swecc=2 parts=1 boot_part_size=4194304 gpio=130619 HZ=300000000 mem=128M kmac=74:4D:28:F5:35:5E board=951HnD Board=951HnD board_rev=r2 ver=6.44.4 bver=6.43.2 hw_opt=00290005 boot=1 mlc=11 roo
tfstype=squashfs noinitrd

I have a box full of these devices (20 nos) ordered 2 weeks back.

[codemarauder]

This pull request has solved the problem for the new revision of the hardware.