[openwrt/openwrt] qualcommax: make header length configurable on Build/mstc-header

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/2186f4aa757d63f22cdd6cb3b02d09d15848b1f6

commit 2186f4aa757d63f22cdd6cb3b02d09d15848b1f6
Author: INAGAKI Hiroshi <musashino.open at gmail.com>
AuthorDate: Tue Jun 3 23:56:13 2025 +0900

    qualcommax: make header length configurable on Build/mstc-header
    
    I-O DATA WN-DAX3000GR has a MSTC (Mitra Star Technology Corp.) specific
    header with a different length than ELECOM WRC-X3000GS2.
    Make the header length configurable by parameterizing on
    Build/mstc-header.
    
    - WRC-X3000GS2: 0x400
    - WN-DAX3000GR: 0x480
    
    Signed-off-by: INAGAKI Hiroshi <musashino.open at gmail.com>
    Link: https://github.com/openwrt/openwrt/pull/19053
    Signed-off-by: Robert Marko <robimarko at gmail.com>
---
 target/linux/qualcommax/image/ipq50xx.mk | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/target/linux/qualcommax/image/ipq50xx.mk b/target/linux/qualcommax/image/ipq50xx.mk
index 4de3fd292b..3ea222c984 100644
--- a/target/linux/qualcommax/image/ipq50xx.mk
+++ b/target/linux/qualcommax/image/ipq50xx.mk
@@ -1,7 +1,8 @@
 DEVICE_VARS += BOOT_SCRIPT
 
 define Build/mstc-header
-	$(eval version=$(1))
+	$(eval version=$(word 1,$(1)))
+	$(eval hdrlen=$(if $(word 2,$(1)),$(word 2,$(1)),0x400))
 	gzip -c $@ | tail -c8 > $@.crclen
 	( \
 		printf "CMOC"; \
@@ -10,7 +11,7 @@ define Build/mstc-header
 			dd bs=64 count=1 conv=sync 2>/dev/null; \
 		printf "$(version)" | \
 			dd bs=64 count=1 conv=sync 2>/dev/null; \
-		dd if=/dev/zero bs=884 count=1 2>/dev/null; \
+		dd if=/dev/zero bs=$$(($(hdrlen) - 0x8c)) count=1 2>/dev/null; \
 		cat $@; \
 	) > $@.new
 	mv $@.new $@