I have build uboot and kernel from https://www.digikey.com/eewiki/display/linuxonarm/BeagleBone+Black and create SD card as per instrucution.This one having minimal image. i want to add overlays in order to do change status of some pin(High to low). I dont want to build kernel again. When searched the inertnet all are old one slote base overlay. but in my image there in bb_cap_manager in /etc/device/ and not slot file. After read some thread,got to know and overlays is shifted uboot and there is not kernel overlays. Can anyone explain me how to create overlays first all and how to add in uboot. Any help will be appreciated.

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