bcm53xx: build factory images for WZR-900DHP series

only factory images for DHP-EU and DHP2-JP (fw ver. 2.x) are built.

this will not work for DHP-JP/AP/TW (fw ver. 1.x) because they use
different buffalo_csum() formula.

Signed-off-by: FUKAUMI Naoki <naobsd@gmail.com>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

target/linux/bcm53xx/image/Makefile

@@ -38,6 +38,17 @@ define Build/bcm53xx-tplink-safeloader
 	rm $@.trx
 endef
 
+define Build/buffalo-wzr-header
+	$(eval product=$(word 1,$(1)))
+	$(eval region=$(word 2,$(1)))
+	( \
+		echo $(product)_$(BUFFALO_TAG_VERSION)_$(BUFFALO_TAG_MINOR)_$(region)_$(BUFFALO_TAG_PLATFORM); \
+		echo filelen=$$(stat -c%s $@); \
+		cat $@ \
+	) > $@.new
+	mv $@.new $@
+endef
+
 define Build/trx-serial
 	$(STAGING_DIR_HOST)/bin/trx \
 		-o $@.new \
@@ -85,6 +96,7 @@ define Build/seama-nand
 endef
 
 DEVICE_VARS += PRODUCTID SIGNATURE NETGEAR_BOARD_ID NETGEAR_REGION TPLINK_BOARD
+DEVICE_VARS += BUFFALO_TAG_PLATFORM BUFFALO_TAG_VERSION BUFFALO_TAG_MINOR
 
 BRCMFMAC_43602A1 := kmod-brcmfmac brcmfmac-firmware-43602a1-pcie
 BRCMFMAC_4366B1 := kmod-brcmfmac brcmfmac-firmware-4366b1-pcie
@@ -151,6 +163,20 @@ TARGET_DEVICES += buffalo-wzr-600dhp2
 define Device/buffalo-wzr-900dhp
   DEVICE_TITLE := Buffalo WZR-900DHP
   DEVICE_PACKAGES := kmod-b43 $(USB3_PACKAGES)
+  BUFFALO_TAG_PLATFORM := bcm
+  BUFFALO_TAG_VERSION := 9.99
+  BUFFALO_TAG_MINOR := 9.99
+  IMAGES += factory-DHP-EU.bin factory-DHP2-JP.bin
+  IMAGE/factory-DHP-EU.bin := \
+	append-ubi | trx-nand | buffalo-wzr-header WZR-900DHP EU | \
+	buffalo-enc WZR-900DHP $$(BUFFALO_TAG_VERSION) | \
+	buffalo-tag-dhp WZR-900DHP EU mlang20 | buffalo-enc-tag | \
+	buffalo-dhp-image
+  IMAGE/factory-DHP2-JP.bin := \
+	append-ubi | trx-nand | buffalo-wzr-header WZR-900DHP2 JP | \
+	buffalo-enc WZR-900DHP2 $$(BUFFALO_TAG_VERSION) | \
+	buffalo-tag-dhp WZR-900DHP2 JP jp | buffalo-enc-tag | \
+	buffalo-dhp-image
 endef
 TARGET_DEVICES += buffalo-wzr-900dhp