Onboard WLAN drivers for RPi Zero 2 W running Ubuntu Server 20.04.3 64-bit

Rpi Zero 2 W finally arrived, managed to get 20.04.3 64-bit booted after doing the RPi3 udate & upgrade dance by adding:

[pi0]

kernel=uboot_rpi_3.bin

after [Pi3] in the config.txt as described here

Stuck getting onboard Wi-Fi working although a Pi USB dongle works OK. Basically rfkill list all doesn't show anything, should list WLAN0 which it does if I insert a USB Wi-Fi dongle.

Tried adding drivers as suggested here but didn't work for me:-(

Need 20.04 64-bit for an ROS project, would be SWEET to have it running on the Zero 2. Can work around with the USB Dongle Wi-Fi for now but it would sure be nice to have onboard Wi-Fi...

Edit as requested below, CLI commandsudo dmesg | grep -i sdio yields:

[   19.255552] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43430-sdio for chip BCM43430/1

[   19.321864] brcmfmac mmc1:0001:1: Direct firmware load for brcm/brcmfmac43430-sdio.raspberrypi,model-zero-2.txt failed with error -2

[   19.321990] brcmfmac mmc1:0001:1: Direct firmware load for brcm/brcmfmac43430-sdio.txt failed with error -2

[   20.328472] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50

Worked around this issue for awhile with a cana kit wifi dongle but really need the onboard wifi now to get rid of the giant (relativeley speaking:-) USB hub.

So, per below I tried following after wget this file and here are the results. If I remove the wifi dongle (and reboot) there is still no wlan0.

sudo cp brcmfmac43430-sdio.raspberrypi,model-zero-w.txt brcmfmac43430-sdio.raspberrypi,model-zero-2.txt sudo dmesg | grep brcm

[   18.849187] brcmfmac: F1 signature read @0x18000000=0x1541a9a6
[   18.863213] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43430-sdio for chip BCM43430/1
[   18.876023] usbcore: registered new interface driver brcmfmac
[   20.075000] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50
[   21.087395] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50

Please try:

cd /usr/lib/firmware/brcm
sudo wget https://github.com/openwrt/cypress-nvram/blob/master/brcmfmac43430-sdio.txt

Reboot and let us see:

sudo dmesg | grep brcm

EDIT: The message log still shows that the device wants the firmware file brcm/brcmfmac43430-sdio.raspberrypi,model-zero-2.txt. A thorough internet search finds no such file. I suggest that we rename a similar file to see if it helps.

cd /usr/lib/firmware/brcm
sudo cp brcmfmac43430-sdio.raspberrypi,model-zero-w.txt brcmfmac43430-sdio.raspberrypi,model-zero-2.txt

Reboot and again edit your question to show:

sudo dmesg | grep brcm