Add support of coredump with CM4

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

recipes-extended/m4coredump/files/85-m4-dump.rules

@@ -0,0 +1 @@
+SUBSYSTEM=="devcoredump", ACTION=="add", RUN+="#BINDIR#/stm32mp-m4fwdump.sh"

recipes-extended/m4coredump/files/stm32mp-m4fwdump.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+mkdir -p /var/crash
+timestamp=$(date +%F_%H-%M-%S)
+filename=/var/crash/m4-fw-error_${timestamp}.dump
+cat /sys/${DEVPATH}/data > ${filename}
+echo 1 > /sys/${DEVPATH}/data

recipes-extended/m4coredump/m4fwcoredump.bb

@@ -0,0 +1,24 @@
+DESCRIPTION = "Script to manage coredump of cortexM4"
+HOMEPAGE = "www.st.com"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
+
+DEPENDS = "udev"
+
+SRC_URI = " \
+    file://85-m4-dump.rules \
+    file://stm32mp-m4fwdump.sh \
+    "
+
+S = "${WORKDIR}"
+
+do_install() {
+    install -D -p -m0644 ${WORKDIR}/85-m4-dump.rules \
+        ${D}${sysconfdir}/udev/rules.d/85-m4-dump.rules
+
+    install -d ${D}${sbindir}/
+    install -m0755 ${WORKDIR}/stm32mp-m4fwdump.sh ${D}${sbindir}/
+
+    sed -i -e "s:#BINDIR#:${sbindir}:g" \
+              ${D}${sysconfdir}/udev/rules.d/85-m4-dump.rules
+}