FDT overlay: lost in the documentation

[Matwey V. Kornilov]

Hello

I have a board with SPI where U-Boot image is located along with
environment settings. The image is supplied with correct FDT, so no
additional dtb files are required to boot Linux from MMC. I.e. fdtcontrol
variable is set up by U-Boot. Then EFI is used to execute Grub2 which
handles the rest.

I've read
https://docs.u-boot.org/en/latest/usage/fdt_overlays.html#manually-loading-and-applying-overlays
but it describes mostly how to do the overlay loading manually. What I want
to achieve is to automatically apply FDT overlay from a specific dtbo file
located on MMC at each boot. What is the recommended way to do that? Will
rewriting the bootcmd env with pretended commands work for me?



With best regards,
Matwey V. Kornilov