Ok, well in my case I was:
- 1. missing the firmware at all as I thought it is not required for this 
device, but this was quickly resolved, my kernel config is as follows:
ares ~ # grep -Hrn "FIRMWARE" /usr/src/linux/.config 
/usr/src/linux/.config:1541:CONFIG_PREVENT_FIRMWARE_BUILD=y 
/usr/src/linux/.config:1543:CONFIG_FIRMWARE_IN_KERNEL=y 
/usr/src/linux/.config:1544:CONFIG_EXTRA_FIRMWARE="brcm/brcmfmac43602-pcie.bin 
brcm/BCM-0a5c-6410.hcd" 
/usr/src/linux/.config:1545:CONFIG_EXTRA_FIRMWARE_DIR="/lib/firmware" 
/usr/src/linux/.config:3222:# CONFIG_CYPRESS_FIRMWARE is not set 
/usr/src/linux/.config:3372:# CONFIG_DRM_LOAD_EDID_FIRMWARE is not set 
/usr/src/linux/.config:3428:CONFIG_FIRMWARE_EDID=y 
/usr/src/linux/.config:5000:CONFIG_FIRMWARE_MEMMAP=y 
/usr/src/linux/.config:5009:# CONFIG_GOOGLE_FIRMWARE is not set 
/usr/src/linux/.config:5408:CONFIG_TEST_FIRMWARE=y

2. The message "Direct firmware load for brcm/brcmfmac43602-pcie.txt
failed with error -2" is not an issue in general, such file is related
to calibration as per my understanding and is not provided for this
device.

3. The message "brcmf_cfg80211_reg_notifier: not a ISO3166 code" might
cause or not some issue, but this is probably related to manufacturer
based on discussions on Gentoo forum

4. I got confirmation from one Gentoo guy from link referenced in previous post 
by me that he has the device and it works, but mine still didn't work. The last 
step I check was network stack app boot and found that both packages are in 
default runlevel:
net-misc/networkmanager-1.6.2_pre 
net-misc/dhcpcd-6.11.3 

Once I disabled dhcpcd (which is anyway auto-started on demand by
NetworkManager and that was somehow causing issue and continuous
switching of MAC addresses as well) I was able to connect to wifi.

Stability - I am on 4.10.3-gentoo kernel and:
A. At work/airports - I am on Open or WPA2-PSK secured network and all is fine, 
I didn't experienced disconnect or Kernel Panic for about 2 weeks
B. At home - Well, this is still strange. When I work alone all is stable, but 
when my wife sit at me and connect from here Android based Lenovo phone, in 
about less then ~5-30 minutes I get kernel panic. I will try to capture some 
more details about this strange and probably unique situation as I don't 
experience it anywhere else. (probably it is because of my wife :-) )

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https://bugs.launchpad.net/bugs/1600624

Title:
  MacBook wifi doesn't work (brcmfmac)

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