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The kernel is the central component of the operating system and manages hardware, process scheduling, file systems, virtual memory paging, inter-process and network communication, etc.

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What kernel modules and other setup are needed for using the RPi3 built in Wi-Fi?

On Debian for my Raspberry Pi 3, I just had to sudo apt install firmware-brcm80211 wireless-tools, then reboot, and I could then issue sudo ip link set dev wlan0 up and sudo iwlist wlan0 scan.
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