Installed linux-firmware-raspi 4-0ubuntu3 from hirsute proposed and verified that /sys/class/net/wlan0 is present after boot.
And: $ sudo dmesg | grep brcmf [ 12.440670] brcmfmac: F1 signature read @0x18000000=0x15264345 [ 12.452809] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6 [ 12.463110] usbcore: registered new interface driver brcmfmac [ 12.695439] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6 [ 12.712428] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/6 wl0: Jan 4 2021 19:56:29 version 7.45.229 (617f1f5 CY) FWID 01-2dbd9d2e
Installed linux-firmware- raspi 4-0ubuntu3 from hirsute proposed and verified that /sys/class/ net/wlan0 is present after boot.
And: 0x15264345 alloc_request: using brcm/brcmfmac43 455-sdio for chip BCM4345/6 alloc_request: using brcm/brcmfmac43 455-sdio for chip BCM4345/6 preinit_ dcmds: Firmware: BCM4345/6 wl0: Jan 4 2021 19:56:29 version 7.45.229 (617f1f5 CY) FWID 01-2dbd9d2e
$ sudo dmesg | grep brcmf
[ 12.440670] brcmfmac: F1 signature read @0x18000000=
[ 12.452809] brcmfmac: brcmf_fw_
[ 12.463110] usbcore: registered new interface driver brcmfmac
[ 12.695439] brcmfmac: brcmf_fw_
[ 12.712428] brcmfmac: brcmf_c_