configs/aspeed_ast2600evb: new defconfig

The kernel is from upstream and U-Boot is from the OpenBMC branch
because mainline doesn't have the required support for HW, yet.

The main resulting file from the build is a flash image. The partition
layout matches the OpenBMC one for 64M chips. It makes it easier to
update the different partitions from Linux. Intermediate files can be
used to boot from U-boot over the network or to boot QEMU using
-kernel/-initrd/-dtb.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

board/aspeed/common/image.its.template

@@ -0,0 +1,56 @@
+/dts-v1/;
+
+/ {
+	description = "Kernel and buildroot image";
+	#address-cells = <1>;
+
+	images {
+		kernel-1 {
+			description = "Linux kernel";
+			data = /incbin/("zImage");
+			type = "kernel";
+			arch = "arm";
+			os = "linux";
+			compression = "none";
+			load = <0x80001000>;
+			entry = <0x80001000>;
+			hash-1 {
+				algo = "sha256";
+			};
+		};
+		fdt-1 {
+			description = "Flattened Device Tree blob";
+			data = /incbin/("%BOARD_DTB%");
+			type = "flat_dt";
+			arch = "arm";
+			compression = "none";
+			hash-1 {
+				algo = "sha256";
+			};
+		};
+		ramdisk-1 {
+			description = "ramdisk";
+			data = /incbin/("rootfs.cpio.xz");
+			type = "ramdisk";
+			arch = "arm";
+			os = "linux";
+			compression = "none";
+			hash-1 {
+				algo = "sha256";
+			};
+		};
+	};
+
+	configurations {
+		default = "conf-1";
+		conf-1 {
+			description = "Boot Linux kernel with FDT blob, ramdisk";
+			kernel = "kernel-1";
+			fdt = "fdt-1";
+			ramdisk = "ramdisk-1";
+			hash-1 {
+				algo = "sha256";
+			};
+		};
+	};
+};