Bcm drivers are not opensource but does any bcm driver present which is open-source reverse engineered. Like what we see in asahi project.
I think I’ve only ever used the proprietary drivers (unfortunately!), but according to the Arch wiki there seems to be a reverse-engineered driver as well as a mainline driver, both open source.
If I remember correctly from working with OpenWRT and FreshTomato; the open source drivers lack support for Bcm hardware offloading as well as 5GHz
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