[meta-freescale] Missing Atheros ath6k Firmware

[BPK4ever .]

Hello all,
I'm trying to implement a wifi radio through the SDIO on my iMX6 sabre auto
board. But I'm missing the required firmware "/lib/firmware/ath6k/..." in
my file system. I'm new to Yocto and Bitbake, so would someone elaborate
how to get access to the source and how to build this specific package for
the target in this case.
Many Thanks.
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