So on arm64 this works by accident because the kernel loads the fw file:
brcm/brcmfmac43455-sdio.raspberrypi,4-model-b.txt
[ 11.512059] brcmfmac: F1 signature read @0x18000000=0x15264345
[ 11.530710] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio
for chip BCM4345/6
[ 11.540495] usbcore: registered new interface driver brcmfmac
[ 11.781454] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio
for chip BCM4345/6
[ 11.802739] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/6 wl0: Mar 23
2020 02:19:54 version 7.45.206 (r725000 CY) FWID 01-88ee44ea
But on armhf it tries to load a non-existing fw file:
brcm/brcmfmac43455-sdio.raspberrypi,4-compute-module.txt
[ 11.212993] brcmfmac: F1 signature read @0x18000000=0x15264345
[ 11.255150] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio
for chip BCM4345/6
[ 11.264126] usbcore: registered new interface driver brcmfmac
[ 11.287281] brcmfmac mmc1:0001:1: Direct firmware load for
brcm/brcmfmac43455-sdio.raspberrypi,4-compute-module.txt failed with error -2
[ 11.301774] brcmfmac mmc1:0001:1: Direct firmware load for
brcm/brcmfmac43455-sdio.txt failed with error -2
[ 12.333944] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl
0x50
** Also affects: linux-firmware-raspi2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1912905
Title:
Can't find WLAN device on RPI-CM4L with 20.10 armhf preinstall server
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