add rpi5 custom example

board/raspberrypi5_custom/post-build.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+set -u
+set -e
+
+# Add a console on tty1
+if [ -e ${TARGET_DIR}/etc/inittab ]; then
+    grep -qE '^tty1::' ${TARGET_DIR}/etc/inittab || \
+	sed -i '/GENERIC_SERIAL/a\
+tty1::respawn:/sbin/getty -L  tty1 0 vt100 # HDMI console' ${TARGET_DIR}/etc/inittab
+# systemd doesn't use /etc/inittab, enable getty.tty1.service instead
+elif [ -d ${TARGET_DIR}/etc/systemd ]; then
+    mkdir -p "${TARGET_DIR}/etc/systemd/system/getty.target.wants"
+    ln -sf /lib/systemd/system/getty@.service \
+       "${TARGET_DIR}/etc/systemd/system/getty.target.wants/getty@tty1.service"
+fi