diff --git a/documents/rockchip/openEuler适配指南.md b/documents/rockchip/openEuler适配指南.md
index efd30b2..bf7f074 100644
--- a/documents/rockchip/openEuler适配指南.md
+++ b/documents/rockchip/openEuler适配指南.md
@@ -112,7 +112,11 @@ POST_BOARD_OVERLAY() {
        
         - msdos: allwinner
 
-  6.  POST_BOARD_OVERLAY()
+  6.  boot_size
+
+       开发板系统镜像的大小，单位为：MB。
+
+  7.  POST_BOARD_OVERLAY()
 
       `POST_BOARD_OVERLAY()` 是执行复制 firmware 文件到根目录以及对目标开发板根目录执行特定操作的函数，其使用的变量与 [build_rootfs.sh](../../scripts/build_rootfs.sh) 相同，通常包含以下两个变量：
 
diff --git a/scripts/boards/armsom-sige5.conf b/scripts/boards/armsom-sige5.conf
index bc1f646..90ad630 100644
--- a/scripts/boards/armsom-sige5.conf
+++ b/scripts/boards/armsom-sige5.conf
@@ -5,6 +5,7 @@ platform=rockchip
 soc_name=rk3576
 arch=arm64
 part_table=gpt
+boot_size=512
 
 POST_BOARD_OVERLAY() {
     echo "Put ${board} firmware into rootfs..."
diff --git a/scripts/boards/firefly-itx-3588j.conf b/scripts/boards/firefly-itx-3588j.conf
index 809bbae..f1305be 100644
--- a/scripts/boards/firefly-itx-3588j.conf
+++ b/scripts/boards/firefly-itx-3588j.conf
@@ -5,6 +5,7 @@ platform=rockchip
 soc_name=rk3588
 arch=arm64
 part_table=gpt
+boot_size=256
 
 POST_BOARD_OVERLAY() {
     echo "Put ${board} firmware into rootfs..."
diff --git a/scripts/boards/firefly-rk3399.conf b/scripts/boards/firefly-rk3399.conf
index 52c43d2..c320c49 100644
--- a/scripts/boards/firefly-rk3399.conf
+++ b/scripts/boards/firefly-rk3399.conf
@@ -4,6 +4,7 @@ platform=rockchip
 soc_name=rk3399
 arch=arm64
 part_table=gpt
+boot_size=256
 
 POST_BOARD_OVERLAY() {
     echo "Put ${board} firmware into rootfs..."
diff --git a/scripts/boards/firefly-roc-rk3566-pc.conf b/scripts/boards/firefly-roc-rk3566-pc.conf
index 1ead54d..39c0ddf 100644
--- a/scripts/boards/firefly-roc-rk3566-pc.conf
+++ b/scripts/boards/firefly-roc-rk3566-pc.conf
@@ -5,6 +5,7 @@ platform=rockchip
 soc_name=rk3566
 arch=arm64
 part_table=gpt
+boot_size=256
 
 POST_BOARD_OVERLAY() {
     echo "Put ${board} firmware into rootfs..."
diff --git a/scripts/boards/firefly-roc-rk3568-pc-se.conf b/scripts/boards/firefly-roc-rk3568-pc-se.conf
index fcc2151..cb6f1df 100644
--- a/scripts/boards/firefly-roc-rk3568-pc-se.conf
+++ b/scripts/boards/firefly-roc-rk3568-pc-se.conf
@@ -5,6 +5,7 @@ platform=rockchip
 soc_name=rk3568
 arch=arm64
 part_table=gpt
+boot_size=256
 
 POST_BOARD_OVERLAY() {
     echo "Put ${board} firmware into rootfs..."
diff --git a/scripts/boards/firefly-roc-rk3568-pc.conf b/scripts/boards/firefly-roc-rk3568-pc.conf
index c043327..be978c8 100644
--- a/scripts/boards/firefly-roc-rk3568-pc.conf
+++ b/scripts/boards/firefly-roc-rk3568-pc.conf
@@ -5,6 +5,7 @@ platform=rockchip
 soc_name=rk3568
 arch=arm64
 part_table=gpt
+boot_size=256
 
 POST_BOARD_OVERLAY() {
     echo "Put ${board} firmware into rootfs..."
diff --git a/scripts/boards/firefly-roc-rk3588s-pc.conf b/scripts/boards/firefly-roc-rk3588s-pc.conf
index 3dc6d3b..db00d4b 100644
--- a/scripts/boards/firefly-roc-rk3588s-pc.conf
+++ b/scripts/boards/firefly-roc-rk3588s-pc.conf
@@ -5,6 +5,7 @@ platform=rockchip
 soc_name=rk3588
 arch=arm64
 part_table=gpt
+boot_size=256
 
 POST_BOARD_OVERLAY() {
     echo "Put ${board} firmware into rootfs..."
diff --git a/scripts/boards/longanpi-3h.conf b/scripts/boards/longanpi-3h.conf
index e3765f8..f4a0f81 100644
--- a/scripts/boards/longanpi-3h.conf
+++ b/scripts/boards/longanpi-3h.conf
@@ -5,6 +5,7 @@ platform=allwinner
 soc_name=h618
 arch=arm64
 part_table=msdos
+boot_size=256
 
 POST_BOARD_OVERLAY() {
     echo "Put ${board} firmware into rootfs..."
diff --git a/scripts/boards/orangepi-zero2.conf b/scripts/boards/orangepi-zero2.conf
index 5f0bbc9..8866bf0 100644
--- a/scripts/boards/orangepi-zero2.conf
+++ b/scripts/boards/orangepi-zero2.conf
@@ -5,6 +5,7 @@ platform=allwinner
 soc_name=h616
 arch=arm64
 part_table=msdos
+boot_size=256
 
 POST_BOARD_OVERLAY() {
     echo "Put ${board} firmware into rootfs..."
diff --git a/scripts/boards/phytiumpi-4gb.conf b/scripts/boards/phytiumpi-4gb.conf
index 312fdb7..9dadac3 100644
--- a/scripts/boards/phytiumpi-4gb.conf
+++ b/scripts/boards/phytiumpi-4gb.conf
@@ -5,6 +5,7 @@ platform=phytium
 soc_name=e2000q
 arch=arm64
 part_table=gpt
+boot_size=256
 
 POST_BOARD_OVERLAY() {
     echo "Put ${board} firmware into rootfs..."
diff --git a/scripts/boards/radxa-rock-5b.conf b/scripts/boards/radxa-rock-5b.conf
index 54bbe8a..3a1e23f 100644
--- a/scripts/boards/radxa-rock-5b.conf
+++ b/scripts/boards/radxa-rock-5b.conf
@@ -5,6 +5,7 @@ platform=rockchip
 soc_name=rk3588
 arch=arm64
 part_table=gpt
+boot_size=256
 
 POST_BOARD_OVERLAY() {
     echo "Put ${board} firmware into rootfs..."
diff --git a/scripts/boards/radxa-rockpi-4a.conf b/scripts/boards/radxa-rockpi-4a.conf
index 6d2d5f6..fdee9be 100644
--- a/scripts/boards/radxa-rockpi-4a.conf
+++ b/scripts/boards/radxa-rockpi-4a.conf
@@ -4,6 +4,7 @@ platform=rockchip
 soc_name=rk3399
 arch=arm64
 part_table=gpt
+boot_size=256
 
 POST_BOARD_OVERLAY() {
     echo "Put ${board} firmware into rootfs..."
diff --git a/scripts/boards/raspberrypi.conf b/scripts/boards/raspberrypi.conf
index 6c5b2b3..69d25c3 100644
--- a/scripts/boards/raspberrypi.conf
+++ b/scripts/boards/raspberrypi.conf
@@ -4,6 +4,7 @@ platform=broadcom
 soc_name=
 arch=arm64
 part_table=msdos
+boot_size=512
 
 POST_BOARD_OVERLAY() {
     echo "Put ${board} firmware into rootfs..."
diff --git a/scripts/boards/sample.conf b/scripts/boards/sample.conf
index d36679d..e73d699 100644
--- a/scripts/boards/sample.conf
+++ b/scripts/boards/sample.conf
@@ -4,6 +4,7 @@ platform=rockchip  #Required! The platform of target board, which defaults to ro
 soc_name=rk3399
 arch=arm64
 part_table=gpt
+boot_size=256
 
 POST_BOARD_OVERLAY() {
     echo "Put ${board} firmware into rootfs..."
diff --git a/scripts/build_boot.sh b/scripts/build_boot.sh
index f29048a..ba0a27b 100755
--- a/scripts/build_boot.sh
+++ b/scripts/build_boot.sh
@@ -264,7 +264,6 @@ mk_boot() {
         dracut --no-kernel ${boot_dir}/initrd.img
         LOG "gen initrd done."
 
-        dtb_name=$(ls ${boot_dir} | grep dtb)
         LOG "gen extlinux config for $dtb_name"
         if [ "${platform}" == "rockchip" ];then
             bootargs=${rockchip_bootargs}
@@ -279,13 +278,13 @@ mk_boot() {
         echo "label openEuler
         kernel /Image
         initrd /initrd.img
-        fdt /${dtb_name}
+        fdt /${dtb_name}.dtb
         append  ${bootargs}" \
         > ${boot_dir}/extlinux/extlinux.conf
 
         LOG "gen extlinux config done."
     fi
-    dd if=/dev/zero of=${workdir}/boot.img bs=1M count=240 status=progress
+    dd if=/dev/zero of=${workdir}/boot.img bs=1M count=${boot_size} status=progress
     mkfs.vfat -n boot ${workdir}/boot.img
     if [ -d ${workdir}/boot_emmc ];then rm -rf ${workdir}/boot_emmc; fi
     mkdir ${workdir}/boot_emmc
diff --git a/scripts/gen_image.sh b/scripts/gen_image.sh
index 41f58df..a6b1671 100755
--- a/scripts/gen_image.sh
+++ b/scripts/gen_image.sh
@@ -144,8 +144,8 @@ make_img(){
 
     device=""
     LOSETUP_D_IMG
-    size=`ls -l --block-size=1MiB ${workdir}/rootfs.img | awk '{ print $5 }'`
-    size=$(($size+1100))
+    root_size=`ls -l --block-size=1MiB ${workdir}/rootfs.img | awk '{ print $5 }'`
+    size=$((${root_size}+${boot_size}+880))
     losetup -D
     img_file=${workdir}/${name}.img
     LOG create ${img_file} size of ${size}MiB
@@ -154,11 +154,11 @@ make_img(){
     LOG "create ${part_table} partition table."
     if [ "x${board}" == "xraspberrypi" ]; then
         section1_start=16384
-        section1_end=1064959
     else
         section1_start=32768
-        section1_end=524287
     fi
+    section1_end=$((${section1_start}+(${boot_size}*2048)-1))
+
     parted ${img_file} mklabel ${part_table} mkpart primary fat32 ${section1_start}s ${section1_end}s
     parted ${img_file} -s set 1 boot on
     parted ${img_file} mkpart primary ext4 $(($section1_end+1))s 100%