mx25pdk: Use generic filesystem commands

This rework the board to use the generic filesystem commands instead
of forcing the use of FAT for the boot files.
Signed-off-by: NOtavio Salvador <otavio@ossystems.com.br>

configs/mx25pdk_defconfig

@@ -14,7 +14,8 @@ CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_DATE=y
-CONFIG_CMD_EXT2=y
-CONFIG_CMD_FAT=y
+CONFIG_CMD_FS_GENERIC=y
+CONFIG_DOS_PARTITION=y
 CONFIG_ENV_IS_IN_MMC=y
+CONFIG_FS_FAT=y
 CONFIG_OF_LIBFDT=y

include/configs/mx25pdk.h

@@ -70,6 +70,9 @@
 
 /* U-Boot commands */
 
+/* Filesystem support */
+#define CONFIG_FS_EXT4
+
 /* Ethernet */
 #define CONFIG_FEC_MXC
 #define CONFIG_FEC_MXC_PHYADDR		0x1f
@@ -138,11 +141,11 @@
 	"mmcargs=setenv bootargs console=${console},${baudrate} " \
 		"root=${mmcroot}\0" \
 	"loadbootscript=" \
-		"fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};\0" \
+		"load mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};\0" \
 	"bootscript=echo Running bootscript from mmc ...; " \
 		"source\0" \
-	"loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}\0" \
-	"loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}\0" \
+	"loadimage=load mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}\0" \
+	"loadfdt=load 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 " \