pr: can flash using bus pirate

a little bit hacky, as we are just sending commands to the BP
and then dropping into bridge mode on the same uart.

Requires user to press the BP button during the flash

Signed-off-by: Kieran Levin <ktl@frame.work>

Author: kiram9

scripts/flash_ec_buspirate.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+
+DEVICE=${DEVICE:-"/dev/serial/by-id/usb-Bus_Pirate_Bus_Pirate_5"}
+CTRLUART=(${DEVICE}*-if00)
+FLASHUART=$(basename $(readlink ${DEVICE}*-if00))
+
+if [ $# -eq 0 ]; then
+	#no argument, try default locations
+	search_paths=("${HOME}/software/ec-lotus/src/platform/ec/build/zephyr/azalea/output"\
+		"${HOME}/chromiumos/src/platform/ec/build/zephyr/azalea/output")
+  
+	for search in ${search_paths[@]}
+	do
+		if [ -d $search ] 
+		then
+			echo "${search} exists"
+			FLASH_SRC="${search}/ec.bin"
+			MONITOR="${search}/npcx_monitor.bin"
+		fi
+	done
+else
+  #allow specifying a file as argument
+  FLASH_SRC="$1/ec.bin"
+  MONITOR="$1/npcx_monitor.bin"
+fi
+echo "USING ${FLASH_SRC} to flash EC"
+
+#clear any invalid commands from uart buffer
+echo -e "n\r\n" > ${CTRLUART}
+#put ec into reset 
+echo -e "\r\na 2\r\n" > ${CTRLUART}
+#read INPUT < ${CTRLUART}
+sleep 1
+
+#enable 10k external pulldown on UART RX wired to pin 20
+echo -e "\r\na 6\r\n" > ${CTRLUART}
+sleep 1
+
+# take out of reset
+ echo -e "\r\n@ 2\r\n" > ${CTRLUART}
+sleep 1
+
+echo -e "\r\nbridge\r\n" > ${CTRLUART}
+
+sleep 1
+
+#### DO FLASH
+echo "Using NUVOTON Tool ./uartupdatetool" 
+./uartupdatetool --port ${FLASHUART} --opr wr --addr 0x200c3020 --file ${MONITOR}
+./uartupdatetool --port ${FLASHUART} --opr wr --auto --addr 0x0000 --file ${FLASH_SRC}
+
+read -p "Press button on buspirate" userinput
+
+#### TAKE OUT OF RESET
+
+#put ec into reset 
+echo -e "\r\na 2\r\n" > ${CTRLUART}
+#read INPUT < ${CTRLUART}
+sleep 1
+
+#disable 10k external pulldown on UART RX wired to pin 20
+echo -e "\r\n@ 6\r\n" > ${CTRLUART}
+sleep 1
+
+
+# take out of reset
+echo -e "\r\n@ 2\r\n" > ${CTRLUART}