Hi Matwey, On Fri, 9 Jan 2026 at 04:45, Matwey V. Kornilov <[email protected]> wrote: > > > > With best regards, > Matwey V. Kornilov > > пт, 9 янв. 2026 г., 14:33 Simon Glass <[email protected]>: >> >> Hi Matwey, >> >> On Wed, 7 Jan 2026 at 06:00, Matwey V. Kornilov >> <[email protected]> wrote: >> > >> > 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? >> >> We should really be using FIT for this. It is designed for this >> purpose and is a better solution than individual files. > > > Ok, I see. I just want to make some experiments on the table. So, my concern > about FIT is that I would need to reflash whole bootloader for that... and > then revert back. Isn't there less destructive way?
Oh I see. Well there is the 'fdt apply' command so you could run that in a script, perhaps? Regards, SImon
