Rbf with overlay

[dawn]

I am using the Linux Xfce Desktop (kernel 4.1.33-ltsi-altera) image from terasic for my de10 board. I’m trying to load rbf over overlay. I followed the method in the below forum.

Load fpga rbf from device tree overlay example?

I have managed to get a 4.9.20 kernel and 2017 u-boot going on my de0-nano-soc board. I’d like to be able to load the FGPA from linux. Recent versions of the kernel seem to work with device tree overlays to accomplish that. I searched the net but could not find a nice working example. Is there an example for dt overlay which can load a simple rbf (only blinking leds, no interaction with Linux).? Thanks.

. but i’m getting the following error

@socfpga:~# echo load_rbf.dtbo > /config/device-tree/overlays/test/path
[ 6126.498665] OF: overlay: of_build_overlay_info() failed for tree@/
[ 6126.504860] create_overlay: Failed to create overlay (err=-19)
-sh: echo: write error: No such device

my overlay file contents
/dts-v1/ /plugin/;
/ {
fragment@0 {
target-path = “/soc/base-fpga-region”;
#address-cells = <1>;
#size-cells = <1>;
overlay {
firmware-name = “de10_soc.rbf”;
#address-cells = <1>;
#size-cells = <1>;
};
};
};

Any idea why the overlay is not loading?Do we have to build the kernel from source to add the overlay?I checked the kernel source available on git. It has the parent node as below

arch/arm/boot/dts/socfpga.dtsi
base_fpga_region: base-fpga-region {
compatible = “fpga-region”;
fpga-mgr = <&fpgamgr0>;

                    #address-cells = <0x1>;
                    #size-cells = <0x1>;
            };

[dawn]

Hi, this issue is resolved by adding following change in
arch/arm/boot/dts/socfpga.dtsi

base_fpga_region: base-fpga-region {
compatible = “fpga-region”;
fpga-mgr = <&fpgamgr0>;
fpga-bridges = <&fpga_bridge0>;

                    #address-cells = <0x1>;
                    #size-cells = <0x1>;
            };

modifying