[FS#704] brcmfmac / Raspberry Pi 3 / wifi not working / adhoc and 80211s-mode

[LEDE Bugs]

The following task has a new comment added:

FS#704 - brcmfmac / Raspberry Pi 3 / wifi not working / adhoc and 80211s-mode
User who did this - Manus Freedom (manusfreedom)

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Same problem as https://bugs.lede-project.org/index.php?do=details&task_id=664
I think we need a more global fix.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=704#comment2477