[linux-firmware] Raspberry pi 4 wlan0 is missing

[karog]

Also occurs on my RPi zero W which is of course a real pain since WLAN is its only network access.

[TonyC]

Anyone else?

WiFi previously working on a Raspberry Pi 8GB using the raspberrypi4 kernel.

Roll back to 2021/02/10 and it works again.

Packages updated on the 11th are...
Packages (6) cryptsetup-2.3.4-2 device-mapper-2.03.11-3 git-2.30.1-1 glib2-2.66.6-2 linux-firmware-20210208.b79d239-1 psmisc-23.4-1

Just me?

[karog]

Not just you. See Re: [linux-firmware] Raspberry pi 4 wlan0 is missing

[graysky]

MOD NOTE: merged topics

[karog]

Can someone please tell me how I can downgrade my RPi zero W's linux-firmware since I cannot access it via WLAN?

If I mount the W's sdcard root on an odroid N2 (running arch linux) at /mnt/root and I have the older
linux-firmware-20201218.646f159-1-any.pkg.tar.xz, can I just do

pacman -r /mnt/root -U linux-firmware-20201218.646f159-1-any.pkg.tar.xz

and not mess up my N2?

Thx.

ps. I know initramfs-linux.img is normally built but of course I don't want it replaced on the N2. I have a copy of initramfs-linux.img on the W's sd card before the upgrade that wrecked things.

Also, I tried chroot /mnt/root and untar'd the package after seeing which files it changes in /usr. And I copied initramfs-linux.img to the correct boot dir. It seemed like it was booting (light flashed) but I could not connect. Taking this approach, is there some other file or files that are changed beyond initramfs-linux.img and the package files that I could repair?

[graysky]

If both machines run the same flavor, (armv7h, aarch64, etc.) just mount the media to a mount point of your choosing, say /mnt and then use `arch-chroot /mnt` to enter that mount point. Once there, ran `pacman -U /path/to/oldfirmware.pkg.tar.xz` to downgrade. Umount and place the media back in the broken device.

[karog]

$this->bbcode_second_pass_quote('graysky', 'I')f both machines run the same flavor, (armv7h, aarch64, etc.) just mount the media to a mount point of your choosing, say /mnt and then use `arch-chroot /mnt` to enter that mount point. Once there, ran `pacman -U /path/to/oldfirmware.pkg.tar.xz` to downgrade. Umount and place the media back in the broken device.

[Verequies]

So I've just been setting up a new build for my Raspberry Pi 4Bs and have noticed on a fresh download without any modification, Wi-Fi is broken. That is the WLAN interface does not show up. I am not sure whats going on here but there is one possible error in 'dmesg' related to the 'brcmfmac' driver.

$this->bbcode_second_pass_code('', 'brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50')

Any help would be appreciated

[Verequies]

Seem to have fixed it after deleting some txt files relating to the 'brcmfmac43455' in '/lib/firmware/brcm'.
Only keeping 'brcmfmac43455-sdio.Raspberry Pi Foundation-Raspberry Pi 4 Model B.txt' brings back the 'wlan0' interface.

[graysky]

$this->bbcode_second_pass_quote('Verequies', 'S')eem to have fixed it after deleting some txt files relating to the 'brcmfmac43455' in '/lib/firmware/brcm'.
Only keeping 'brcmfmac43455-sdio.Raspberry Pi Foundation-Raspberry Pi 4 Model B.txt' brings back the 'wlan0' interface.