RPi4B 5GHz WiFi problems #985632 & #981616 completely went away by replacing brcmfmac43455-sdio.bin and brcmfmac43455-sdio.clm_blob
Control: reassign 981616 firmware-brcm80211 20201218-3
Hi,
two RPi4B 5GHz WiFi problems
#985632
firmware-brcm80211: [REGRESSION] RPi4B 5GHz WiFi stopped working with 20210208-4, 20201218-3 was fine
and
#981616
5GHz WiFi does not work with vc4.ko on RPi4 and 4K display
completely went away by replacing
/lib/firmware/brcm/brcmfmac43455-sdio.bin and
/lib/firmware/brcm/brcmfmac43455-sdio.clm_blob
by the files at
https://github.com/RPi-Distro/firmware-nonfree/tree/master/brcm
Commit messages at https://github.com/RPi-Distro/firmware-nonfree/tree/master/brcm
are interesting:
Use BCM43456 clm_blob on CYW43455
The previous CYW43455 clm_blob provides limited access to the higher
5GHz channels (100+) - the BCM43456 (surprisingly) seems to work and
doesn't have this problem. Huh????
Update CYW43455 firmware
This release fixes the error: Firmware trap: type 0x4 @ epc 0x0007a094
The full version string is:
Version 7.45.229 (617f1f5 CY) CRC: 253bd863 Date: Mon 2021-01-04 19:58:58 PST Ucode Ver: 1043.2160 FWID 01-2dbd9d2e
See: raspberrypi/linux#3849
Best regards,
Ryutaroh Matsumoto
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