diff -Nuar u-boot-at91/build.sh u-boot-at91-sama5d4/build.sh
--- u-boot-at91/build.sh	1970-01-01 08:00:00.000000000 +0800
+++ u-boot-at91-sama5d4/build.sh	2019-08-22 19:29:07.323275389 +0800
@@ -0,0 +1,67 @@
+#!/bin/bash
+
+BOARD=sama5d4
+TFTP_PATH=/tftp
+IMGS_PATH=../images
+IMG_NAME=u-boot-${BOARD}.bin
+
+CROSSTOOL=/opt/buildroot/cortex-a5/bin/arm-linux-
+JOBS=`cat /proc/cpuinfo |grep "processor"|wc -l`
+
+
+function do_clean()
+{
+    make CROSS_COMPILE=${CROSSTOOL} distclean
+    rm -f cscope* tags
+    rm -f ${IMG_NAME}
+}
+
+function do_modify()
+{
+    grep "arm-linux-gnueabi" Makefile > /dev/null
+
+    if [ $? == 0  ] ; then
+        return ;
+    fi
+
+    echo "Modify Makefile for  ARCH and cross compiler"
+    sed -i -e "s|^CROSS_COMPILE=.*|CROSS_COMPILE=${CROSSTOOL}|g" Makefile
+}
+
+function do_build()
+{
+    make ${BOARD}_xplained_nandflash_config
+
+    make -j${JOBS}
+
+    cp u-boot.bin ${IMG_NAME}
+
+    chmod a+x ${IMG_NAME}
+}
+
+function do_install()
+{
+    if [ -d $TFTP_PATH ] ;then 
+        cp ${IMG_NAME} $TFTP_PATH
+    fi
+
+    if [ -d ${IMGS_PATH} ] ; then
+        cp ${IMG_NAME} $IMGS_PATH
+    fi
+}
+
+if [ "$1" == "clean" ] ; then 
+
+    do_clean
+    exit 0;
+fi
+
+do_modify
+
+set -e
+
+do_build
+
+do_install
+
+
diff -Nuar u-boot-at91/include/configs/sama5d4_xplained.h u-boot-at91-sama5d4/include/configs/sama5d4_xplained.h
--- u-boot-at91/include/configs/sama5d4_xplained.h	2019-08-04 21:52:13.000000000 +0800
+++ u-boot-at91-sama5d4/include/configs/sama5d4_xplained.h	2019-08-22 23:56:21.299582959 +0800
@@ -38,7 +38,7 @@
 #define CONFIG_USART_BASE		ATMEL_BASE_USART3
 #define	CONFIG_USART_ID			ATMEL_ID_USART3
 
-#define CONFIG_BOOTDELAY		3
+#define CONFIG_BOOTDELAY		1
 
 /*
  * BOOTP options
@@ -170,12 +170,10 @@
 #elif CONFIG_SYS_USE_NANDFLASH
 /* bootstrap + u-boot + env in nandflash */
 #define CONFIG_ENV_IS_IN_NAND
-#define CONFIG_ENV_OFFSET		0xc0000
-#define CONFIG_ENV_OFFSET_REDUND	0x100000
-#define CONFIG_ENV_SIZE			0x20000
-#define CONFIG_BOOTCOMMAND	"nand read 0x21000000 0x180000 0x80000;" \
-				"nand read 0x22000000 0x200000 0x600000;" \
-				"bootz 0x22000000 - 0x21000000"
+#define CONFIG_ENV_OFFSET		    0xC0000
+#define CONFIG_ENV_SIZE			    0x20000
+//#define CONFIG_ENV_OFFSET_REDUND	0xa0000
+#define CONFIG_BOOTCOMMAND	"nand read 0x22000000 0x100000 0x700000; bootm 0x22000000" 
 #elif CONFIG_SYS_USE_MMC
 /* bootstrap + u-boot + env in sd card */
 #define CONFIG_ENV_IS_IN_FAT
@@ -194,6 +192,35 @@
 				"bootz 0x22000000 - 0x21000000"
 #endif
 
+/* add by guowenxue, 2019.08.22 */
+#define CONFIG_FIT              1
+#define CONFIG_ENV_OVERWRITE    1
+#define CONFIG_ETHADDR          42:96:ab:be:a7:5e
+#define CONFIG_IPADDR           192.168.2.199
+#define CONFIG_SERVERIP         192.168.2.2
+
+
+
+#define CONFIG_TFTPBOOT         "tftp 0x22000000 linuxrom-sama5d4.itb && bootm 0x22000000" 
+
+#define CONFIG_BBL              "tftp 0x21000000 u-boot-sama5d4.bin && nand erase 0x40000 0xC0000;" \
+                                "nand write 0x21000000 0x40000 ${filesize}"
+     
+#define CONFIG_BKR              "tftp 0x22000000 linuxrom-sama5d4.itb && nand erase 0x100000 0x700000; " \
+                                "nand write 0x22000000 0x100000 ${filesize}"
+
+#define CONFIG_BFS              "tftp 0x21000000 rootfs-sama5d4.ubi && nand erase 800000 c800000; " \
+                                "nand write 0x21000000 800000 ${filesize}"
+
+#define CONFIG_BSYS             "run bbl; run bkr; run bfs"
+
+#define CONFIG_CLRAPPS          "nand erase d000000 13000000"
+
+#define CONFIG_DBGRUN           "run bfs; run tb"
+
+
+
+
 #ifdef CONFIG_SYS_USE_MMC
 #define CONFIG_BOOTARGS							\
 	"console=ttyS0,115200 earlyprintk "				\
@@ -201,10 +228,7 @@
 #else
 #define CONFIG_BOOTARGS							\
 	"console=ttyS0,115200 earlyprintk "				\
-	"mtdparts=atmel_nand:256k(bootstrap)ro,512k(uboot)ro,"		\
-	"256K(env),256k(evn_redundent),256k(spare),"			\
-	"512k(dtb),6M(kernel)ro,-(rootfs) "				\
-	"rootfstype=ubifs ubi.mtd=7 root=ubi0:rootfs"
+	"rootfstype=ubifs ubi.mtd=2 root=ubi0:rootfs rw"
 #endif
 
 #define CONFIG_BAUDRATE			115200
diff -Nuar u-boot-at91/include/env_default.h u-boot-at91-sama5d4/include/env_default.h
--- u-boot-at91/include/env_default.h	2019-08-04 21:52:13.000000000 +0800
+++ u-boot-at91-sama5d4/include/env_default.h	2019-08-22 23:47:56.027573267 +0800
@@ -76,6 +76,30 @@
 #ifdef	CONFIG_SERVERIP
 	"serverip="	__stringify(CONFIG_SERVERIP)	"\0"
 #endif
+
+/* add by guowenxue, 2019.08.22  */
+#ifdef	CONFIG_TFTPBOOT
+	"tb="	CONFIG_TFTPBOOT	"\0"
+#endif
+#ifdef  CONFIG_BBL
+	"bbl="	CONFIG_BBL	"\0"
+#endif
+#ifdef CONFIG_BKR
+	"bkr="	CONFIG_BKR	"\0"
+#endif 
+#ifdef	CONFIG_BFS
+	"bfs="	CONFIG_BFS	"\0"
+#endif
+#ifdef CONFIG_BSYS
+	"bsys="	CONFIG_BSYS	"\0"
+#endif
+#ifdef	CONFIG_CLRAPPS
+	"clrapps="	CONFIG_CLRAPPS	"\0"
+#endif
+#ifdef	CONFIG_DBGRUN
+	"dbg="	CONFIG_DBGRUN	"\0"
+#endif
+
 #ifdef	CONFIG_SYS_AUTOLOAD
 	"autoload="	CONFIG_SYS_AUTOLOAD		"\0"
 #endif
diff -Nuar u-boot-at91/Makefile u-boot-at91-sama5d4/Makefile
--- u-boot-at91/Makefile	2019-08-04 21:52:12.000000000 +0800
+++ u-boot-at91-sama5d4/Makefile	2019-08-22 19:29:07.323275389 +0800
@@ -194,6 +194,9 @@
 
 #########################################################################
 
+ARCH=arm
+CROSS_COMPILE=/opt/crosstool/cortex-a7/bin/arm-linux-gnueabi-
+
 # set default to nothing for native builds
 ifeq ($(HOSTARCH),$(ARCH))
 CROSS_COMPILE ?=