mx28evk: Add 'nandboot' environment command

This reads the kernel, ftd and boot into ubifs filesystem. While on
that, the SD firmware filename definition has been moved next to the
other SD related commands.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Reviewed-by: Fabio Estevam <fabio.estevam@freescale.com>

include/configs/mx28evk.h

@@ -162,7 +162,6 @@
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	"update_nand_full_filename=u-boot.nand\0" \
 	"update_nand_firmware_filename=u-boot.sb\0"	\
-	"update_sd_firmware_filename=u-boot.sd\0" \
 	"update_nand_firmware_maxsz=0x100000\0"	\
 	"update_nand_stride=0x40\0"	/* MX28 datasheet ch. 12.12 */ \
 	"update_nand_count=0x4\0"	/* MX28 datasheet ch. 12.12 */ \
@@ -190,6 +189,23 @@
 		"nand write ${loadaddr} ${fcb_sz} ${filesize} ; " \
 		"nand write ${loadaddr} ${fw_off} ${filesize} ; " \
 		"fi\0" \
+	"nandargs=setenv bootargs console=${console_mainline},${baudrate} " \
+		"rootfstype=ubifs ubi.mtd=6 root=ubi0_0 ${mtdparts}\0" \
+	"nandboot="		/* Boot from NAND */ \
+		"mtdparts default; " \
+		"run nandargs; " \
+		"nand read ${loadaddr} kernel 0x00400000; " \
+		"if test ${boot_fdt} = yes; then " \
+			"nand read ${fdt_addr} fdt 0x00080000; " \
+			"bootm ${loadaddr} - ${fdt_addr}; " \
+		"else " \
+			"if test ${boot_fdt} = no; then " \
+				"bootm; " \
+			"else " \
+				"echo \"ERROR: Set boot_fdt to yes or no.\"; " \
+			"fi; " \
+		"fi\0" \
+	"update_sd_firmware_filename=u-boot.sd\0" \
 	"update_sd_firmware="		/* Update the SD firmware partition */ \
 		"if mmc rescan ; then "	\
 		"if tftp ${update_sd_firmware_filename} ; then " \