Allwinner: Enable DT overlays support

projects/Allwinner/bootloader/release

@@ -4,9 +4,11 @@
 SRCDIR="$BUILD/image/system/usr/share/bootloader"
 DSTDIR="$RELEASE_DIR/3rdparty/bootloader"
 
-mkdir -p "$DSTDIR"
+mkdir -p "$DSTDIR/overlays"
   if [ -n "$UBOOT_SYSTEM" ]; then
     cp -a "$SRCDIR/u-boot-sunxi-with-spl.bin" "$DSTDIR"
   fi
 
   cp -a "$SRCDIR"/sun*-${DEVICE,,}-*.dtb "$DSTDIR"
+
+  cp -a "$SRCDIR"/overlays/sun*-${DEVICE,,}-*.dtbo "$DSTDIR"/overlays

projects/Allwinner/bootloader/update.sh

@@ -27,6 +27,13 @@ fi
     fi
   done
 
+# update Device Tree Overlays
+  if [ -d $SYSTEM_ROOT/usr/share/bootloader/overlays ]; then
+    echo "*** updating Device Tree Overlays ..."
+    mkdir -p /flash/overlays
+    cp -p $SYSTEM_ROOT/usr/share/bootloader/overlays/* /flash/overlays
+  fi
+
 # update bootloader files
   if [ -f $SYSTEM_ROOT/usr/share/bootloader/u-boot-sunxi-with-spl.bin ]; then
     echo "*** updating U-Boot on: $BOOT_DISK ..."

projects/Allwinner/options

@@ -61,3 +61,6 @@
 
   # debug tty path
     DEBUG_TTY="/dev/console"
+
+  # additional packages to install:
+    ADDITIONAL_PACKAGES="dt-overlays"