Pi Zero 2 W: Different revisions, different WLAN firmwares

[hpingel]

Hi Rene,
Yesterday I noticed that two different PI Zero 2 W PCBs can have different WLAN hardware: These logger lines exist on different Pis:

wlan: ether4330: chip 43430 rev2 type 1 (my Pi)
wlan: ether4330: chip 43430 rev1 type 1 (the Pi of a colleague)
In the next line my colleague gets this:
wlan: ether 4330: can't enable HT clock: csr 50
wlan: I/O error

Now, I was wondering if this error could be related to the WLAN firmware files. But it could also be something else like a power supply or a hardware fault. (EDIT: The colleague told me he didn't copy all the firmware files in the meantime. So his problem seems to be fixed.)

Today I came accross this ticket: RPi-Distro/firmware-nonfree#23

I tried to understand if this is of any relevance to the issue above and am not convinced. But anyway, I wanted to let you know that there are some firmware files for the Zero 2 W in https://github.com/RPi-Distro/firmware-nonfree/tree/bullseye/debian/config/brcm80211/brcm that are not yet grabbed by wget from Circle's side.

The missing files are:
brcmfmac43436s-sdio.bin
brcmfmac43436s-sdio.txt

And there were some changes to some files after October 2021.

Cheers,
Henning

P.S.: Also see: RPi-Distro/firmware-nonfree@b3eec61

[hpingel]

I just grasped that a firmware brcmfmac43436s-sdio.* will only be necessary for a future revision of the Pi Zero 2 W that is probably not yet available due to the global chip crisis anyway.

I just tested all Pi Zero 2 W boards I have here and they all have either rev1 or rev2.

[rsta2]

The WLAN device driver has separate entries for revision 1 and 2 of the 43430 chip, so this difference should be handled well. As I understand it, there is currently no need to change something. But I will keep an eye on this and this issue will remain open. Thanks for this info!

[rsta2]

The updated WLAN firmware (see #602) has a specific driver for newer RPi Zero 2 W. Unfortunately I don't know the chip ID and revision for this firmware, because I do not have such RPi Zero 2 W. If somebody notes, that his/her WLAN does not work with a RPi Zero 2 W, he/she may add the IDs here. They can be found in the log messages.

[rsta2]

If somebody owns a Raspberry Pi Zero 2 W, which was produced after Oct 2025 with this change, it would be great if she/he could test the addon/wlan/sample/hello_wlan with it and tell me the chip ID and revision of the WLAN device. It should be shown on the screen, when the sample starts. I would like to add this to the WLAN driver. Thanks!