help! i'm having starting troubles..
i downloaded Raspberry Pi 4B/400/CM4 (32bit) from firmware-selector. after firstboot, i have no wifi 
/etc/config/wireless is not created
iw list returns nothing
i tried both 32bit and 64bit openwrt images. same problem. no wireless.
wifi is working with official rpi image, as also with aosp and lineageos.
You do know that WLAN is disabled by default?
Do you have got a LAN connection to your RaspPi and access to LuCI?
yes
yes and yes
Just to make sure that there's no bug in the snapshot, could you please try the latest stable?
latest stable has this problem that's why i thought to try snapshot hoping that is more uptodate
houston we have liftoff 
since wifi is working with official pi os, i decided to have another look there. pi400 wifi firmware used there is brcmfmac43456-sdio, which is missing in openwrt. look in /lib/firmware/brcm.
so i copied /lib/firmware/brcm/brcmfmac43456-sdio* from my raspios to openwrt. a quick reboot and we have wifi.
just wanted to add that wifi is listed in luci as
Cypress CYW43455 802.11ac/b/g/n
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