mx28evk: Set default environment to use zImage

Change the default environment to use zImage instead of uImage, this
requires changes to the default environment to load a file named
zImage instead of uImage, and to use the 'bootz' command instead of
'bootm' when booting the kernel.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>

include/configs/mx28evk.h

@@ -198,7 +198,7 @@
 		"else " \
 			"setenv get_cmd tftp; " \
 		"fi; " \
-		"${get_cmd} ${uimage}; " \
+		"${get_cmd} ${image}; " \
 		"nand write ${loadaddr} kernel ${filesize}\0" \
 	"update_nand_fdt="		/* Update fdt */ \
 		"mtdparts default; " \
@@ -230,10 +230,10 @@
 		"nand read ${loadaddr} kernel 0x00400000; " \
 		"if test ${boot_fdt} = yes; then " \
 			"nand read ${fdt_addr} fdt 0x00080000; " \
-			"bootm ${loadaddr} - ${fdt_addr}; " \
+			"bootz ${loadaddr} - ${fdt_addr}; " \
 		"else " \
 			"if test ${boot_fdt} = no; then " \
-				"bootm; " \
+				"bootz; " \
 			"else " \
 				"echo \"ERROR: Set boot_fdt to yes or no.\"; " \
 			"fi; " \
@@ -248,7 +248,7 @@
 		"fi ; "	\
 		"fi\0" \
 	"script=boot.scr\0"	\
-	"uimage=uImage\0" \
+	"image=zImage\0" \
 	"console_fsl=ttyAM0\0" \
 	"console_mainline=ttyAMA0\0" \
 	"fdt_file=imx28-evk.dtb\0" \
@@ -264,22 +264,22 @@
 		"fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};\0" \
 	"bootscript=echo Running bootscript from mmc ...; "	\
 		"source\0" \
-	"loaduimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${uimage}\0" \
+	"loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}\0" \
 	"loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}\0" \
 	"mmcboot=echo Booting from mmc ...; " \
 		"run mmcargs; " \
 		"if test ${boot_fdt} = yes || test ${boot_fdt} = try; then " \
 			"if run loadfdt; then " \
-				"bootm ${loadaddr} - ${fdt_addr}; " \
+				"bootz ${loadaddr} - ${fdt_addr}; " \
 			"else " \
 				"if test ${boot_fdt} = try; then " \
-					"bootm; " \
+					"bootz; " \
 				"else " \
 					"echo WARN: Cannot load the DT; " \
 				"fi; " \
 			"fi; " \
 		"else " \
-			"bootm; " \
+			"bootz; " \
 		"fi;\0" \
 	"netargs=setenv bootargs console=${console_mainline},${baudrate} " \
 		"root=/dev/nfs " \
@@ -291,19 +291,19 @@
 		"else " \
 			"setenv get_cmd tftp; " \
 		"fi; " \
-		"${get_cmd} ${uimage}; " \
+		"${get_cmd} ${image}; " \
 		"if test ${boot_fdt} = yes; then " \
 			"if ${get_cmd} ${fdt_addr} ${fdt_file}; then " \
-				"bootm ${loadaddr} - ${fdt_addr}; " \
+				"bootz ${loadaddr} - ${fdt_addr}; " \
 			"else " \
 				"if test ${boot_fdt} = try; then " \
-					"bootm; " \
+					"bootz; " \
 				"else " \
 					"echo WARN: Cannot load the DT; " \
 				"fi;" \
 			"fi; " \
 		"else " \
-			"bootm; " \
+			"bootz; " \
 		"fi;\0"
 
 #define CONFIG_BOOTCOMMAND \
@@ -311,7 +311,7 @@
 		"if run loadbootscript; then " \
 			"run bootscript; " \
 		"else " \
-			"if run loaduimage; then " \
+			"if run loadimage; then " \
 				"run mmcboot; " \
 			"else run netboot; " \
 			"fi; " \