Hello,
First time contacting a kernel mailing list.
I've been trying to fix the wireless on my laptop ( MacBookPro12,1 ). It has very weak signal strength. I have at least partially read through the following:
https://askubuntu.com/questions/775011/macbook-pro-16-04-wifi-driver-installed-but-not-available
https://askubuntu.com/questions/1064442/wifi-not-working-with-bcm43602-on-ubuntu-18-04
https://askubuntu.com/questions/622988/wifi-issues-with-macbook-pro-retina-early-2015-12-2-on-ubuntu-15-04
https://wiki.debian.org/brcmfmac
https://ubuntuforums.org/showthread.php?t=2354365
https://askubuntu.com/questions/884291/ubuntu-14-04-wireless-not-working-on-macbook-pro-dual-boot
https://www.mail-archive.com/linux-wireless@xxxxxxxxxxxxxxx/msg17229.html
https://www.mail-archive.com/search?l=ubuntu-bugs@xxxxxxxxxxxxxxxx&q=subject:%22%5C%5BBug+1693521%5C%5D+Re%5C%3A+brcmfmac%5C%3A+Direct+firmware+load+failed%22&o=newest
https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1772624
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/brcm/
I created empty files at `/lib/firmware/{brcmfmac43602-pcie.Apple\ Inc.-MacBookPro14\,2.txt,brcmfmac43602-pcie.txt}`
```
$ dmesg | grep brcm
[ 5.305998] usbcore: registered new interface driver brcmfmac
[ 5.433599] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43602-pcie for chip BCM43602/2
[ 5.435140] brcmfmac 0000:02:00.0: loading /lib/firmware/brcm/brcmfmac43602-pcie.Apple Inc.-MacBookPro14,2.txt failed with error -22
[ 5.435142] brcmfmac 0000:02:00.0: Direct firmware load for brcm/brcmfmac43602-pcie.Apple Inc.-MacBookPro14,2.txt failed with error -22
[ 5.435358] brcmfmac 0000:02:00.0: loading /lib/firmware/brcm/brcmfmac43602-pcie.txt failed with error -22
[ 5.435359] brcmfmac 0000:02:00.0: Direct firmware load for brcm/brcmfmac43602-pcie.txt failed with error -22
[ 5.781881] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43602-pcie for chip BCM43602/2
[ 5.781910] brcmfmac: brcmf_c_process_clm_blob: no clm_blob available (err=-2), device may have limited channels available
[ 5.782927] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM43602/2 wl0: Nov 10 2015 06:38:10 version 7.35.177.61 (r598657) FWID 01-ea662a8c
[ 5.828561] brcmfmac 0000:02:00.0 wlp2s0: renamed from wlan0
```
What I think may need to happen is to have a particular configuration added like https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/plain/brcm/brcmfmac43430-sdio.raspberrypi,3-model-b.txt as `brcmfmac43602-pcie.txt` in order to make the full range of channels available, and by that improve signal strength, but this is only a shot in the dark.
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