tegra: enable NAND on Harmony

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>

board/nvidia/dts/tegra20-harmony.dts

@@ -54,4 +54,14 @@
 	usb@c5004000 {
 		status = "disabled";
 	};
+
+	nand-controller@70008000 {
+		nvidia,wp-gpios = <&gpio 23 0>;		/* PC7 */
+		nvidia,width = <8>;
+		nvidia,timing = <26 100 20 80 20 10 12 10 70>;
+		nand@0 {
+			reg = <0>;
+			compatible = "hynix,hy27uf4g2b", "nand-flash";
+		};
+	};
 };

include/configs/harmony.h

@@ -62,8 +62,15 @@
 #define CONFIG_CMD_EXT2
 #define CONFIG_CMD_FAT
 
-/* Environment not stored */
-#define CONFIG_ENV_IS_NOWHERE
+/* NAND support */
+#define CONFIG_CMD_NAND
+#define CONFIG_TEGRA_NAND
+#define CONFIG_SYS_MAX_NAND_DEVICE	1
+#define CONFIG_SYS_NAND_BASE	TEGRA20_NAND_BASE
+
+/* Environment in NAND (which is 512M), aligned to start of last sector */
+#define CONFIG_ENV_IS_IN_NAND
+#define CONFIG_ENV_OFFSET	(SZ_512M - SZ_128K) /* 128K sector size */
 
 /* USB Host support */
 #define CONFIG_USB_EHCI