diff --git a/chip-TOSH4GB-flash.sh b/chip-TOSH4GB-flash.sh
new file mode 100755
index 0000000..9cc5b3c
--- /dev/null
+++ b/chip-TOSH4GB-flash.sh
@@ -0,0 +1,144 @@
+#!/bin/bash
+
+set -x
+
+SCRIPTDIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
+source $SCRIPTDIR/common.sh
+
+##############################################################
+#  main
+##############################################################
+while getopts "flpu:" opt; do
+  case $opt in
+    f)
+      echo "fastboot enabled"
+      METHOD=fastboot
+      ;;
+    l)
+      echo "factory mode remain in u-boot after flashing"
+      AFTER_FLASHING=loop
+      ;;
+    u)
+      BUILDROOT_OUTPUT_DIR="${OPTARG}"
+      ;;
+    p)
+      POCKET_CHIP=true
+      ;;
+    \?)
+      echo "Invalid option: -$OPTARG" >&2
+      exit 1
+      ;;
+  esac
+done
+
+echo "BUILDROOT_OUTPUT_DIR = $BUILDROOT_OUTPUT_DIR"
+
+FEL=fel
+
+METHOD=${METHOD:-fel}
+AFTER_FLASHING=${AFTER_FLASHING:-wait}
+
+
+NAND_ERASE_BB=false
+if [ "$1" == "erase-bb" ]; then
+	NAND_ERASE_BB=true
+fi
+
+PATH=$PATH:$BUILDROOT_OUTPUT_DIR/host/usr/bin
+TMPDIR=`mktemp -d -t chipflashXXXXXX`
+PADDED_SPL="${BUILDROOT_OUTPUT_DIR}/images/sunxi-spl-with-ecc.bin"
+PADDED_SPL_SIZE=0
+UBOOT_SCRIPT="${BUILDROOT_OUTPUT_DIR}/images/uboot.scr"
+UBOOT_SCRIPT_MEM_ADDR=0x43100000
+UBOOT_SCRIPT_SRC="$TMPDIR/uboot.cmds"
+SPL="$BUILDROOT_OUTPUT_DIR/images/sunxi-spl.bin"
+SPL_MEM_ADDR=0x43000000
+UBOOT="$BUILDROOT_OUTPUT_DIR/images/u-boot-dtb.bin"
+PADDED_UBOOT="$BUILDROOT_OUTPUT_DIR/images/padded-u-boot"
+PADDED_UBOOT_SIZE=0x400000
+UBOOT_MEM_ADDR=0x4a000000
+UBI="$BUILDROOT_OUTPUT_DIR/images/rootfs.ubi"
+SPARSE_UBI="${TMPDIR}/rootfs.ubi.sparse"
+UBI_MEM_ADDR=0x4b000000
+
+UBI_SIZE=`filesize $UBI | xargs printf "0x%08x"`
+PAGE_SIZE=16384
+OOB_SIZE=1280
+
+assert_error() {
+	ERR=$?
+	ERRCODE=$1
+	if [ "${ERR}" != "0" ]; then
+		if [ -z "${ERR}" ]; then
+			exit ${ERR}
+		else
+			exit ${ERRCODE}
+		fi
+	fi
+}
+
+echo == preparing images ==
+#prepare_images
+#prepare_uboot_script
+
+echo == upload the SPL to SRAM and execute it ==
+if ! wait_for_fel; then
+  echo "ERROR: please make sure CHIP is connected and jumpered in FEL mode"
+fi
+${FEL} spl "${SPL}"
+assert_error 128
+
+sleep 1 # wait for DRAM initialization to complete
+
+echo == upload spl ==
+${FEL} write $SPL_MEM_ADDR "${PADDED_SPL}" || ( echo "ERROR: could not write ${PADDED_SPL}" && exit $? )
+assert_error 129
+
+echo == upload u-boot ==
+${FEL} write $UBOOT_MEM_ADDR "${PADDED_UBOOT}" || ( echo "ERROR: could not write ${PADDED_UBOOT}" && exit $? )
+assert_error 130
+
+echo == upload u-boot script ==
+${FEL} write $UBOOT_SCRIPT_MEM_ADDR "${UBOOT_SCRIPT}" || ( echo "ERROR: could not write ${UBOOT_SCRIPT}" && exit $? )
+assert_error 131
+
+if [[ "${METHOD}" == "fel" ]]; then
+	echo == upload ubi ==
+	${FEL} --progress write $UBI_MEM_ADDR "${UBI}"
+
+	echo == execute the main u-boot binary ==
+	${FEL} exe $UBOOT_MEM_ADDR
+
+	echo == write ubi ==
+else
+	echo == execute the main u-boot binary ==
+	${FEL} exe $UBOOT_MEM_ADDR
+	assert_error 132
+
+	echo == creating sparse image ==
+#	img2simg ${UBI} ${SPARSE_UBI} $((2*1024*1024))
+	assert_error 133
+
+	echo == waiting for fastboot ==
+	if wait_for_fastboot; then
+		fastboot -i 0x1f3a -u flash UBI $UBI
+		assert_error 134
+
+		fastboot -i 0x1f3a continue
+		assert_error 135
+	else
+		rm -rf "${TMPDIR}"
+		exit 1
+	fi
+fi
+
+if [[ "${METHOD}" == "fel" ]]; then
+	if ! wait_for_linuxboot; then
+		echo "ERROR: could not flash":
+		rm -rf ${TMPDIR}
+		exit 1
+	else
+		${SCRIPTDIR}/verify.sh
+	fi
+fi
+rm -rf "${TMPDIR}"