am335x_evm: Add NAND environment variables

* Added support to the default environment variables for NAND
  boot.
* Add nandboot to the default bootcmd.

Signed-off-by: Chase Maupin <Chase.Maupin@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>

include/configs/am335x_evm.h

@@ -61,12 +61,20 @@
 	"mmcdev=0\0" \
 	"mmcroot=/dev/mmcblk0p2 ro\0" \
 	"mmcrootfstype=ext4 rootwait\0" \
+	"nandroot=ubi0:rootfs rw ubi.mtd=7,2048\0" \
+	"nandrootfstype=ubifs rootwait=1\0" \
+	"nandsrcaddr=0x280000\0" \
+	"nandimgsize=0x500000\0" \
 	"ramroot=/dev/ram0 rw ramdisk_size=65536 initrd=${rdaddr},64M\0" \
 	"ramrootfstype=ext2\0" \
 	"mmcargs=setenv bootargs console=${console} " \
 		"${optargs} " \
 		"root=${mmcroot} " \
 		"rootfstype=${mmcrootfstype}\0" \
+	"nandargs=setenv bootargs console=${console} " \
+		"${optargs} " \
+		"root=${nandroot} " \
+		"rootfstype=${nandrootfstype}\0" \
 	"bootenv=uEnv.txt\0" \
 	"loadbootenv=fatload mmc ${mmcdev} ${loadaddr} ${bootenv}\0" \
 	"importbootenv=echo Importing environment from mmc ...; " \
@@ -81,6 +89,10 @@
 	"mmcboot=echo Booting from mmc ...; " \
 		"run mmcargs; " \
 		"bootm ${loadaddr}\0" \
+	"nandboot=echo Booting from nand ...; " \
+		"run nandargs; " \
+		"nand read ${loadaddr} ${nandsrcaddr} ${nandimgsize}; " \
+		"bootm ${loadaddr}\0" \
 	"ramboot=echo Booting from ramdisk ...; " \
 		"run ramargs; " \
 		"bootm ${loadaddr}\0" \
@@ -106,6 +118,8 @@
 		"if run loaduimage; then " \
 			"run mmcboot;" \
 		"fi;" \
+	"else " \
+		"run nandboot;" \
 	"fi;" \
 
 /* Clock Defines */