MycroftOS: Show a boot splash as early as possible in the bootproces

A clean "empty splash.png at boot however the same fbv code can be
used later on in the develoment and proces to show the user where
in the boot / configuration proces we are at.
- "Connect to wifi SSID" user information for the wifi configuration
- But also possible other cofiguration step later on in the wizard

buildroot-external/board/raspberrypi/config.txt

@@ -11,7 +11,7 @@ kernel=zImage
 
 # Disable overscan assuming the display supports displaying the full resolution
 # If the text shown on the screen disappears off the edge, comment this out
-# disable_overscan=1
+disable_overscan=1
 
 # How much memory in MB to assign to the GPU on Pi models having
 # 256, 512 or 1024 MB total memory

buildroot-external/configs/mycroftos_rpi3_defconfig

@@ -78,6 +78,7 @@ BR2_PACKAGE_PKGCONF=y
 BR2_PACKAGE_E2FSPROGS=y
 BR2_PACKAGE_E2FSPROGS_RESIZE2FS=y
 BR2_PACKAGE_NTFS_3G=y
+BR2_PACKAGE_FBV=y
 BR2_PACKAGE_RPI_BT_FIRMWARE=y
 BR2_PACKAGE_RPI_FIRMWARE=y
 BR2_PACKAGE_RPI_FIRMWARE_X=y
@@ -127,8 +128,6 @@ BR2_PACKAGE_LIBOPENSSL_BIN=y
 BR2_PACKAGE_LIBOPENSSL_ENGINES=y
 BR2_PACKAGE_LIBCONFIG=y
 BR2_PACKAGE_LIBNFS=y
-BR2_PACKAGE_JPEG=y
-BR2_PACKAGE_LIBPNG=y
 BR2_PACKAGE_BCM2835=y
 BR2_PACKAGE_WIRINGPI=y
 BR2_PACKAGE_LIBMPEG2=y

buildroot-external/rootfs-overlay/etc/init.d/S00asplash

@@ -0,0 +1,22 @@
+#!/bin/sh
+#
+# Loading boot splash
+#
+
+start() {
+	printf "Loading boot splash ..."
+	cat /dev/zero 1> /dev/fb0 2>/dev/null
+	fbv -f -d 1 /opt/mycroft/splash/boot.png > /dev/null 2>&1
+	echo "[OK]"
+}
+
+case "$1" in
+  start)
+        start
+        ;;
+  *)
+        echo "Usage: $0 {start}"
+        exit 1
+esac
+
+exit $?