raspberrypi3: fix serial console (load pi3-miniuart-bt overlay)

- enable BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTB_OVERLAYS in raspberrypi3_defconfig
- add copy of rpi-firmware/overlays directory to boot partition in genimage-raspberrypi3.cfg
- enhance post-image.sh script to add 'dtoverlay=pi3-miniuart-bt' on request
- add BR2_ROOTFS_POST_SCRIPT_ARGS="--add-pi3-miniuart-bt-overlay" in raspberrypi3_defconfig

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/board/raspberrypi/post-image.sh b/board/raspberrypi/post-image.sh
index 73ffd658e7..c00975288c 100755
--- a/board/raspberrypi/post-image.sh
+++ b/board/raspberrypi/post-image.sh
@@ -5,6 +5,19 @@ BOARD_NAME="$(basename ${BOARD_DIR})"
 GENIMAGE_CFG="${BOARD_DIR}/genimage-${BOARD_NAME}.cfg"
 GENIMAGE_TMP="${BUILD_DIR}/genimage.tmp"
 
+case "${2}" in
+	--add-pi3-miniuart-bt-overlay)
+	if ! grep -qE '^dtoverlay=' "${BINARIES_DIR}/rpi-firmware/config.txt"; then
+		echo "Adding 'dtoverlay=pi3-miniuart-bt' to config.txt (fixes ttyAMA0 serial console)."
+		cat << __EOF__ >> "${BINARIES_DIR}/rpi-firmware/config.txt"
+
+# fixes rpi3 ttyAMA0 serial console
+dtoverlay=pi3-miniuart-bt
+__EOF__
+	fi
+	;;
+esac
+
 # Mark the kernel as DT-enabled
 mkdir -p "${BINARIES_DIR}/kernel-marked"
 ${HOST_DIR}/usr/bin/mkknlimg "${BINARIES_DIR}/zImage" \