diff --git a/chip-flash b/chip-flash
index 7d6bc5c..a384bb8 100755
--- a/chip-flash
+++ b/chip-flash
@@ -103,7 +103,7 @@ SPL="$BUILDROOT_OUTPUT_DIR/images/sunxi-spl.bin"
 SPL_MEM_ADDR=0x43000000
 UBOOT="$BUILDROOT_OUTPUT_DIR/images/u-boot-dtb.bin"
 PADDED_UBOOT="$TMPDIR/padded-uboot"
-PADDED_UBOOT_SIZE=0xc0000
+PADDED_UBOOT_SIZE=0x400000
 UBOOT_MEM_ADDR=0x4a000000
 UBI="$BUILDROOT_OUTPUT_DIR/images/rootfs.ubi"
 SPARSE_UBI="${TMPDIR}/rootfs.ubi.sparse"
@@ -126,17 +126,17 @@ prepare_images() {
     exit 1
   fi
 
-    PADDED_SPL_SIZE=$(filesize "${PADDED_SPL}")
+  PADDED_SPL_SIZE=$(filesize "${PADDED_SPL}")
   PADDED_SPL_SIZE=$(($PADDED_SPL_SIZE / ($PAGE_SIZE + $OOB_SIZE)))
   PADDED_SPL_SIZE=$(echo $PADDED_SPL_SIZE | xargs printf "0x%08x")
   log "PADDED_SPL_SIZE=$PADDED_SPL_SIZE"
 
-    # Align the u-boot image on a page boundary
-    dd if="$UBOOT" of="$PADDED_UBOOT" bs=16k conv=sync
-    UBOOT_SIZE=`filesize "$PADDED_UBOOT" | xargs printf "0x%08x"`
+  # Align the u-boot image on block boundary
+  dd if="$UBOOT" of="$PADDED_UBOOT" bs=4MB conv=sync
+  UBOOT_SIZE=`filesize "$PADDED_UBOOT" | xargs printf "0x%08x"`
   log "UBOOT_SIZE=${UBOOT_SIZE}"
   log "PADDED_UBOOT_SIZE=${PADDED_UBOOT_SIZE}"
-    dd if=/dev/urandom of="$PADDED_UBOOT" seek=$((UBOOT_SIZE / 0x4000)) bs=16k count=$(((PADDED_UBOOT_SIZE - UBOOT_SIZE) / 0x4000))
+  dd if=/dev/urandom of="$PADDED_UBOOT" seek=$((UBOOT_SIZE / 0x4000)) bs=16k count=$(((PADDED_UBOOT_SIZE - UBOOT_SIZE) / 0x4000))
 }
 
 prepare_uboot_script() {