brcm/brcmfmac43456-sdio.pine64,pinebook-pro.* should be symlinks to the common brcm/brcmfmac43455-sdio.AW-CM256SM.*. But there are typos in WHENCE file that put in the wrong order, hence the symlinks were broken. I fixed it in this week, so let's see whether the presence of firmware makes any difference.