I'm trying to port a buildroot build for Pi2 to Pi3. I got the build to boot cleanly by adding the 2710 DTB, but I cannot seem to get the built-in wifi going.
I've tried with both the stripped down version of
bcm2709_defconfig that I was using earlier, and the stock defconfig from the Raspberry Pi kernel source.
The wireless does not appear in the list of network interfaces. The brcmfmac driver is compiled into the kernel instead of a separate module (although I've previously also tried keeping it as a separate module and modprobing manually). All the firmware files that I believe are related are supposedly there:
$ ls /lib/firmware/brcm/
bcm4329-fullmac-4.bin brcmfmac4329-sdio.bin brcmfmac4350-pcie.bin
bcm43xx-0.fw brcmfmac4330-sdio.bin brcmfmac4354-sdio.bin
bcm43xx_hdr-0.fw brcmfmac4334-sdio.bin brcmfmac4356-pcie.bin
brcmfmac43143-sdio.bin brcmfmac43340-sdio.bin brcmfmac43569.bin
brcmfmac43143.bin brcmfmac4335-sdio.bin brcmfmac43570-pcie.bin
brcmfmac43236b.bin brcmfmac43362-sdio.bin brcmfmac43602-pcie.ap.bin
brcmfmac43241b0-sdio.bin brcmfmac4339-sdio.bin brcmfmac43602-pcie.bin
brcmfmac43241b4-sdio.bin brcmfmac43430-sdio.bin brcmfmac4371-pcie.bin
dmesg does not show absolutely any activity related to wireless devices.
What can I do to find out why the device is not appearing? Or do you have any suggestion on what to try next?