bcm63xx: add unmodded SERCOMM AD1018 support

Until now only HW modded SPI flash version was supported.

BCM6328 with 64M RAM and 128M NAND.
More info: https://openwrt.org/toh/sercomm/ad1018

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

target/linux/bcm63xx/image/Makefile

@@ -95,6 +95,31 @@ define Image/FileSystemStrip
 $(firstword $(subst +,$(space),$(subst root.,,$(notdir $(1)))))
 endef
 
+define Build/ad1018-jffs2-cferam
+	mv $@ $@.kernel
+
+	rm -rf $@-cferam
+	mkdir -p $@-cferam
+
+	# CFE RAM JFFS2 partition
+	cp $(KDIR)/bcm63xx-cfe/$(CFE_RAM_FILE) $@-cferam/$(CFE_RAM_JFFS2_NAME)
+	$(call Build/cfe-jffs2,$@-cferam)
+	mv $@ $@.cferam
+
+	# First block of CFE RAM 1 will be destroyed by MMAP
+	dd if=$@.cferam bs=$(BLOCKSIZE) count=1 > $@
+	dd if=$@.cferam >> $@
+	$(call Build/pad-to,896k)
+
+	# CFE RAM 2
+	dd if=$@.cferam >> $@
+
+	# Append kernel @ 4M
+	$(call Build/pad-to,4096k)
+	dd if=$@.kernel >> $@
+	rm -f $@.kernel
+endef
+
 define Build/cfe-bin
 	$(STAGING_DIR_HOST)/bin/imagetag -i $(IMAGE_KERNEL) -f $(IMAGE_ROOTFS) \
 		--output $@ --boardid $(CFE_BOARD_ID) --chipid $(CFE_CHIP_ID) \