M4COREDUMP: add service to enable coredump via remoteproc

Signed-off-by: Christophe Priouzeau <christophe.priouzeau@st.com>
Change-Id: I6d5c1ca745fb2598f1937fa261a6fe5432d7f204

recipes-extended/m4coredump/files/st-m4coredump.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=ST Enable M4 firmware coredump
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/sbin/stm32mp-coredump-sysfs.sh start
+ExecStop=/sbin/stm32mp-coredump-sysfs.sh stop
+
+[Install]
+WantedBy=sysinit.target

recipes-extended/m4coredump/files/stm32mp-coredump-sysfs.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+case $1 in
+start)
+    echo enabled >/sys/class/remoteproc/remoteproc0/coredump
+    ;;
+stop)
+    echo disabled >/sys/class/remoteproc/remoteproc0/coredump
+    ;;
+
+*)
+    echo "$0 [start|stop]"
+    echo "Start/Stop M4 Fwirmware coredump."
+    ;;
+esac
+