buildroot/board/raspberrypi/post-build.sh

#!/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

# exnsure overlays exists for genimage
mkdir -p "${BINARIES_DIR}/rpi-firmware/overlays"