From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Fri, 10 Jul 2015 18:41:11 +0200
Subject: brcm2708: respect CONFIG_TARGET_IMAGES_GZIP

As the brcm2708 images use ext4, they will be huge when uncompressed.

diff --git a/target/linux/brcm2708/image/Makefile b/target/linux/brcm2708/image/Makefile
index e70bdd0..be667f3 100644
--- a/target/linux/brcm2708/image/Makefile
+++ b/target/linux/brcm2708/image/Makefile
@@ -28,6 +28,10 @@ define Image/Build/RaspberryPi
 	mcopy -i $(KDIR)/boot.img $(KDIR)/Image ::kernel.img  # Copy OpenWrt built kernel
 	./gen_rpi_sdcard_img.sh $(BIN_DIR)/$(IMG_PREFIX)-sdcard-vfat-$(1).img $(KDIR)/boot.img $(KDIR)/root.$(1) \
 		$(CONFIG_BRCM2708_SD_BOOT_PARTSIZE) $(CONFIG_TARGET_ROOTFS_PARTSIZE)
+
+  ifneq ($(CONFIG_TARGET_IMAGES_GZIP),)
+	gzip -f9 $(BIN_DIR)/$(IMG_PREFIX)-sdcard-vfat-$(1).img
+  endif
 endef
 
 define Image/Build