[yocto] How to add support for "usb WIFI dongle"?

[Jerry Lian]

I am confused on adding support for "usb WIFI dongle":
* My boards do NOT have WIFI capability, so I will add a "usb WIFI dongle".
  (I have two boards: Raspberri-PI-2, SIMATIC IOT-2020)
* Suppose we start from "core-image-sato"
* What should I do to add support for "usb WIFI dongle"
* After we build/boot the image, how can we verify and bring the WIFI up?

Thanks!
Jerry
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