brcm2708: add support for device tree overlays

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@47125 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/brcm2708/image/Makefile b/target/linux/brcm2708/image/Makefile
index 7a68c50..3744cac 100644 (file)
--- a/target/linux/brcm2708/image/Makefile
+++ b/target/linux/brcm2708/image/Makefile
@@ -21,6 +21,12 @@ else
   endef
 endif
 
+define Image/Prepare
+       rm -rf $(KDIR)/overlays
+       mkdir -p $(KDIR)/overlays
+       $(CP) $(DTS_DIR)/overlays/*.dtb $(KDIR)/overlays/
+endef
+
 ### Image scripts ###
 define Build/gen-cfg
        cat config.txt > $@.config
@@ -41,6 +47,7 @@ define Build/boot-img
        mcopy -i $@.boot $@.config ::config.txt
        mcopy -i $@.boot $(word 1,$^) ::kernel.img
        mcopy -i $@.boot $(DTS_DIR)/$(DEVICE_DTS).dtb ::$(DEVICE_DTS).dtb
+       mcopy -s -i $@.boot $(KDIR)/overlays ::
 endef
 
 define Build/sdcard-img

diff --git a/target/linux/brcm2708/image/config.txt b/target/linux/brcm2708/image/config.txt
index f66f6bc..1fb880f 100644 (file)
--- a/target/linux/brcm2708/image/config.txt
+++ b/target/linux/brcm2708/image/config.txt
@@ -927,3 +927,12 @@ init_uart_clock=3000000
 ################################################################################
 
 dtparam=random=on,watchdog=on,audio=on,i2c0=on,i2c1=on,spi=on
+
+#dtoverlay=hifiberry-amp-overlay
+#dtoverlay=hifiberry-dac-overlay
+#dtoverlay=hifiberry-dacplus-overlay
+#dtoverlay=hifiberry-digi-overlay
+#dtoverlay=iqaudio-dac-overlay
+#dtoverlay=iqaudio-dacplus-overlay
+#dtoverlay=raspidac3-overlay
+#dtoverlay=rpi-proto-overlay