mx28evk: Add support to dynamically choose between fdt use or not

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

include/configs/mx28evk.h

@@ -290,6 +290,10 @@
 	"uimage=uImage\0" \
 	"console_fsl=ttyAM0\0" \
 	"console_mainline=ttyAMA0\0" \
+	"fdt_file=imx28-evk.dtb\0" \
+	"fdt_addr=0x41000000\0" \
+	"boot_fdt=try\0" \
+	"ip_dyn=yes\0" \
 	"mmcdev=0\0" \
 	"mmcpart=2\0" \
 	"mmcroot=/dev/mmcblk0p3 rw rootwait\0" \
@@ -300,15 +304,46 @@
 	"bootscript=echo Running bootscript from mmc ...; "	\
 		"source\0" \
 	"loaduimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${uimage}\0" \
+	"loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}\0" \
 	"mmcboot=echo Booting from mmc ...; " \
-		"run mmcargs; "	\
-		"bootm\0" \
+		"run mmcargs; " \
+		"if test ${boot_fdt} = yes || test ${boot_fdt} = try; then " \
+			"if run loadfdt; then " \
+				"bootm ${loadaddr} - ${fdt_addr}; " \
+			"else " \
+				"if test ${boot_fdt} = try; then " \
+					"bootm; " \
+				"else " \
+					"echo WARN: Cannot load the DT; " \
+				"fi; " \
+			"fi; " \
+		"else " \
+			"bootm; " \
+		"fi;\0" \
 	"netargs=setenv bootargs console=${console_mainline},${baudrate} " \
 		"root=/dev/nfs " \
 		"ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp\0" \
 	"netboot=echo Booting from net ...; " \
 		"run netargs; "	\
-		"dhcp ${uimage}; bootm\0"
+		"if test ${ip_dyn} = yes; then " \
+			"setenv get_cmd dhcp; " \
+		"else " \
+			"setenv get_cmd tftp; " \
+		"fi; " \
+		"${get_cmd} ${uimage}; " \
+		"if test ${boot_fdt} = yes; then " \
+			"if ${get_cmd} ${fdt_addr} ${fdt_file}; then " \
+				"bootm ${loadaddr} - ${fdt_addr}; " \
+			"else " \
+				"if test ${boot_fdt} = try; then " \
+					"bootm; " \
+				"else " \
+					"echo WARN: Cannot load the DT; " \
+				"fi;" \
+			"fi; " \
+		"else " \
+			"bootm; " \
+		"fi;\0"
 
 #define CONFIG_BOOTCOMMAND \
 	"mmc dev ${mmcdev}; if mmc rescan; then " \