[openwrt/openwrt] build: add elecom-product-header for ELECOM devices

[LEDE Commits]

adrian pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/0071c7cd8246197ae27d8a0c4b5bdf7976dbe362

commit 0071c7cd8246197ae27d8a0c4b5bdf7976dbe362
Author: INAGAKI Hiroshi <musashino.open at gmail.com>
AuthorDate: Fri Dec 11 23:14:03 2020 +0900

    build: add elecom-product-header for ELECOM devices
    
    A header used in ELECOM WRC-300GHBK2-I and WRC-1750GHBK2-I/C is also
    used in ELECOM WRC-2533GHBK-I, so split the code to generate the header
    and move it to image-commands.mk to use from ramips target.
    
    Signed-off-by: INAGAKI Hiroshi <musashino.open at gmail.com>
    Reviewed-by: Sungbo Eo <mans0n at gorani.run>
---
 include/image-commands.mk           | 12 ++++++++++++
 target/linux/ath79/image/generic.mk | 10 +++-------
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/include/image-commands.mk b/include/image-commands.mk
index 3beec80c8b..70fa0b8357 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -155,6 +155,18 @@ define Build/check-size
 	}
 endef
 
+define Build/elecom-product-header
+	$(eval product=$(word 1,$(1)))
+	$(eval fw=$(word 2,$(1)))
+
+	( \
+		echo -n -e "ELECOM\x00\x00$(product)" | dd bs=40 count=1 conv=sync; \
+		echo -n "0.00" | dd bs=16 count=1 conv=sync; \
+		dd if=$(fw); \
+	) > $(fw).new
+	mv $(fw).new $(fw)
+endef
+
 define Build/eva-image
 	$(STAGING_DIR_HOST)/bin/lzma2eva $(KERNEL_LOADADDR) $(KERNEL_LOADADDR) $@ $@.new
 	mv $@.new $@
diff --git a/target/linux/ath79/image/generic.mk b/target/linux/ath79/image/generic.mk
index 7432607fcd..c43d396db5 100644
--- a/target/linux/ath79/image/generic.mk
+++ b/target/linux/ath79/image/generic.mk
@@ -19,14 +19,10 @@ define Build/add-elecom-factory-initramfs
 	-f 0x70000 -S 0x01100000 \
 	-i $@ -o $@.factory
 
-  ( \
-	echo -n -e "ELECOM\x00\x00$(product)" | dd bs=40 count=1 conv=sync; \
-	echo -n "0.00" | dd bs=16 count=1 conv=sync; \
-	dd if=$@.factory; \
-  ) > $@.factory.new
+  $(call Build/elecom-product-header,$(product) $@.factory)
 
-  if [ "$$(stat -c%s $@.factory.new)" -le $$(($(subst k,* 1024,$(subst m, * 1024k,$(IMAGE_SIZE))))) ]; then \
-	mv $@.factory.new $(BIN_DIR)/$(KERNEL_INITRAMFS_PREFIX)-factory.bin; \
+  if [ "$$(stat -c%s $@.factory)" -le $$(($(subst k,* 1024,$(subst m, * 1024k,$(IMAGE_SIZE))))) ]; then \
+	mv $@.factory $(BIN_DIR)/$(KERNEL_INITRAMFS_PREFIX)-factory.bin; \
   else \
 	echo "WARNING: initramfs kernel image too big, cannot generate factory image" >&2; \
   fi