x86: fdt: Create basic .dtsi file for coreboot

This contains just the minimum information for a coreboot-based board.

Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/dts/coreboot.dtsi b/arch/x86/dts/coreboot.dtsi
new file mode 100644
index 0000000..4862a59
--- /dev/null
+++ b/arch/x86/dts/coreboot.dtsi
@@ -0,0 +1,16 @@
+/include/ "skeleton.dtsi"
+
+/ {
+	aliases {
+		console = "/serial";
+	};
+
+	serial {
+		compatible = "ns16550";
+		reg-shift = <1>;
+		io-mapped = <1>;
+		multiplier = <1>;
+		baudrate = <115200>;
+		status = "disabled";
+	};
+};