add untested flashrom wrapper for hardware-flashing on a RPi

flashrom_rpi_write.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2018, Martin Kepplinger <martink@posteo.de>
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+NC='\033[0m'
+
+set -e
+
+have_input_image=0
+have_chipname=0
+have_backupname=0
+
+usage()
+{
+	echo "Usage: $0 -i <image.rom> -c <chipname> [-k <backup_filename>]"
+}
+
+args=$(getopt -o i:c:k:h -- "$@")
+if [ $? -ne 0 ] ; then
+	usage
+	exit 1
+fi
+
+eval set -- "$args"
+while [ $# -gt 0 ]
+do
+	case "$1" in
+	-i)
+		INPUT_IMAGE_PATH=$2
+		have_input_image=1
+		shift
+		;;
+	-c)
+		CHIPNAME=$2
+		have_chipname=1
+		shift
+		;;
+	-k)
+		BACKUPNAME=$2
+		have_backupname=1
+		shift
+		;;
+	-h)
+		usage
+		exit 1
+		;;
+	--)
+		shift
+		break
+		;;
+	*)
+		echo "Invalid option: $1"
+		exit 1
+		;;
+	esac
+	shift
+done
+
+if [ ! "$have_input_image" -gt 0 ] ; then
+	echo "no input image provided"
+	usage
+	exit 1
+fi
+
+if [ ! "$have_chipname" -gt 0 ] ; then
+	echo "no chipname provided. to find it out, run flashrom without arguments"
+	usage
+	exit 1
+fi
+
+INPUT_IMAGE_NAME=$(basename ${INPUT_IMAGE_PATH})
+
+echo "verifying SPI connection by reading"
+TEMP_DIR=`mktemp -d`
+if [[ ! "$TEMP_DIR" || ! -d "$TEMP_DIR" ]]; then
+	echo "Could not create temp dir"
+	exit 1
+fi
+flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=128 -c ${CHIPNAME} -r ${TEMP_DIR}/test1.rom
+flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=128 -c ${CHIPNAME} -r ${TEMP_DIR}/test2.rom
+cmp --silent ${TEMP_DIR}/test1.rom ${TEMP_DIR}/test2.rom
+if [ "$have_backupname" -gt 0 ] ; then
+	mv ${TEMP_DIR}/test1.rom ${BACKUPNAME}
+	echo "current image saved as ${BACKUPIMAGE}"
+fi
+rm -rf ${TEMP_DIR}
+
+echo -e "connection ok. flashing ${GREEN}${INPUT_IMAGE_NAME}${NC}"
+flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=128 -c ${CHIPNAME} -w ${INPUT_IMAGE_PATH}