am43xx_evm: Enable NAND boot

Enable booting from NAND on the am437xx-evm.

Signed-off-by: Tom Rini <trini@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/configs/am43xx_evm.h

@@ -295,13 +295,15 @@
 			"setenv fdtfile am437x-idk-evm.dtb; fi; " \
 		"if test $fdtfile = undefined; then " \
 			"echo WARNING: Could not determine device tree; fi; \0" \
+	NANDARGS \
 	NETARGS \
 	DFUARGS \
 
 #define CONFIG_BOOTCOMMAND \
 	"run findfdt; " \
 	"run mmcboot;" \
-	"run usbboot;"
+	"run usbboot;" \
+	NANDBOOT \
 
 #endif
 
@@ -390,6 +392,24 @@
 #define CONFIG_SYS_NAND_SPL_KERNEL_OFFS	0x00300000 /* kernel offset */
 #define CONFIG_CMD_SPL_WRITE_SIZE	CONFIG_SYS_NAND_BLOCK_SIZE
 #endif
-#endif /* !CONFIG_NAND */
+#define NANDARGS \
+	"mtdids=" MTDIDS_DEFAULT "\0" \
+	"mtdparts=" MTDPARTS_DEFAULT "\0" \
+	"nandargs=setenv bootargs console=${console} " \
+		"${optargs} " \
+		"root=${nandroot} " \
+		"rootfstype=${nandrootfstype}\0" \
+	"nandroot=ubi0:rootfs rw ubi.mtd=NAND.file-system,4096\0" \
+	"nandrootfstype=ubifs rootwait=1\0" \
+	"nandboot=echo Booting from nand ...; " \
+		"run nandargs; " \
+		"nand read ${fdtaddr} NAND.u-boot-spl-os; " \
+		"nand read ${loadaddr} NAND.kernel; " \
+		"bootz ${loadaddr} - ${fdtaddr}\0"
+#define NANDBOOT			"run nandboot; "
+#else /* !CONFIG_NAND */
+#define NANDARGS
+#define NANDBOOT
+#endif /* CONFIG_NAND */
 
 #endif	/* __CONFIG_AM43XX_EVM_H */