ARM: dts: aspeed: Reserve framebuffer memory

When used as a BMC, the host expects to be able to use 16MB of
framebuffer memory at the top of RAM.
Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-bmc-opp-palmetto.dts

@@ -18,6 +18,17 @@ chosen {
 	memory {
 		reg = <0x40000000 0x10000000>;
 	};
+
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		vga_memory: framebuffer@5f000000 {
+			no-map;
+			reg = <0x5f000000 0x01000000>; /* 16M */
+		};
+	};
 };
 
 &uart5 {