1U-Boot FDT Overlay usage (without FIT images) 2============================================= 3 4FDT overlays are now available for use even without FIT images. 5It is not as automagic as with FIT images though and require a few 6manual steps. 7 81. Figure out where to place both the base device tree blob and the 9overlay. Make sure you have enough space to grow the base tree without 10overlapping anything. 11 12=> setenv fdtaddr 0x87f00000 13=> setenv fdtovaddr 0x87fc0000 14 152. Load the base blob and overlay blobs 16 17=> load ${devtype} ${bootpart} ${fdtaddr} ${bootdir}/base.dtb 18=> load ${devtype} ${bootpart} ${fdtovaddr} ${bootdir}/overlay.dtb 19 203. Set it as the working fdt tree. 21 22=> fdtaddr $fdtaddr 23 244. Grow it enough so it can 'fit' all the applied overlays 25 26=> fdt resize 8192 27 285. You are now ready to apply the overlay. 29 30=> fdt apply $fdtovaddr 31 32Please note that in case of an error, both the base and overlays are going 33to be invalidated, so keep copies to avoid reloading. 34 35Pantelis Antoniou 36pantelis.antoniou@konsulko.com 3711/7/2017 38