Buildroot on Beaglebone?

We only support u-boot overlays, with a single patch to the linux kernel “-@” for exporting the device tree label’s…

https://github.com/RobertCNelson/bb-kernel/blob/am33x-v5.6/patches/drivers/ti/overlays/0001-ARM-DT-Enable-symbols-when-CONFIG_OF_OVERLAY-is-used.patch

then you just need the 2 u-boot patches:

Regards,