[openwrt/openwrt] ramips: parameterize some values in Build/znet-header

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/cd2a6906daff74c417d939aa14704f5d98bc7501

commit cd2a6906daff74c417d939aa14704f5d98bc7501
Author: INAGAKI Hiroshi <musashino.open at gmail.com>
AuthorDate: Sat May 11 14:14:16 2024 +0900

    ramips: parameterize some values in Build/znet-header
    
    Parameterize magic number and header length to use the device-specific
    values.
    
    example:
    
    On WRC-X1800GS, an additional ELECOM-specific header and a magic number
    "COMC" are required.
    
    Stock FW v1.18:
    
    $ hexdump -n $((0x40080)) -C wrc-x1800gs_v1.18.bin
    00000000  45 4c 45 43 4f 4d 00 00  57 52 43 2d 58 31 38 30  |ELECOM..WRC-X180|
    00000010  30 47 53 00 00 00 00 00  00 00 00 00 00 00 00 00  |0GS.............|
    00000020  00 00 00 00 00 00 00 00  31 2e 31 38 00 00 00 00  |........1.18....|
    00000030  00 00 00 00 00 00 00 00  43 4f 4d 43 04 00 ac 00  |........COMC....|
    00000040  40 f0 49 74 b1 e8 6a ca  e4 20 65 1f 34 2e 30 34  |@.It..j.. e.4.04|
    00000050  28 58 56 46 2e 31 29 62  31 37 00 00 00 00 00 00  |(XVF.1)b17......|
    00000060  00 00 00 00 00 00 00 00  ff ff ff ff ff ff ff ff  |................|
    00000070  ff ff ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|
    *
    00040000  d0 0d fe ed 00 36 9c c0  00 00 00 38 00 36 9a e0  |.....6.....8.6..|
    00040010  00 00 00 28 00 00 00 11  00 00 00 10 00 00 00 00  |...(............|
    00040020  00 00 00 6c 00 36 9a a8  00 00 00 00 00 00 00 00  |...l.6..........|
    00040030  00 00 00 00 00 00 00 00  00 00 00 01 00 00 00 00  |................|
    00040040  00 00 00 03 00 00 00 04  00 00 00 62 65 54 97 8f  |...........beT..|
    00040050  00 00 00 03 00 00 00 28  00 00 00 00 4d 49 50 53  |.......(....MIPS|
    00040060  20 4f 70 65 6e 57 72 74  20 46 49 54 20 28 46 6c  | OpenWrt FIT (Fl|
    00040070  61 74 74 65 6e 65 64 20  49 6d 61 67 65 20 54 72  |attened Image Tr|
    00040080
    
    Signed-off-by: INAGAKI Hiroshi <musashino.open at gmail.com>
---
 target/linux/ramips/image/mt7621.mk | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index 33fcc805d9..1c6cd237d3 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -99,13 +99,15 @@ endef
 
 define Build/znet-header
 	$(eval version=$(word 1,$(1)))
+	$(eval magic=$(if $(word 2,$(1)),$(word 2,$(1)),ZNET))
+	$(eval hdrlen=$(if $(word 3,$(1)),$(word 3,$(1)),0x30))
 	( \
 		data_size_crc="$$(dd if=$@ 2>/dev/null | gzip -c | \
 			tail -c 8 | od -An -N4 -tx4 --endian big | tr -d ' \n')"; \
 		payload_len="$$(dd if=$@ bs=4 count=1 skip=1 2>/dev/null | od -An -tdI --endian big | tr -d ' \n')"; \
 		payload_size_crc="$$(dd if=$@ ibs=1 count=$$payload_len 2>/dev/null | gzip -c | \
 			tail -c 8 | od -An -N4 -tx4 --endian big | tr -d ' \n')"; \
-		echo -ne "\x5A\x4E\x45\x54" | dd bs=4 count=1 conv=sync 2>/dev/null; \
+		echo -ne "$(magic)" | dd bs=4 count=1 conv=sync 2>/dev/null; \
 		echo -ne "$$(printf '%08x' $$(stat -c%s $@) | fold -s2 | xargs -I {} echo \\x{} | tac | tr -d '\n')" | \
 			dd bs=4 count=1 conv=sync 2>/dev/null; \
 		echo -ne "$$(echo $$data_size_crc | sed 's/../\\x&/g')" | \
@@ -114,7 +116,7 @@ define Build/znet-header
 			dd bs=4 count=1 conv=sync 2>/dev/null; \
 		echo -ne "\x12\x34\x56\x78" | dd bs=4 count=1 conv=sync 2>/dev/null; \
 		echo -ne "$(version)" | dd bs=28 count=1 conv=sync 2>/dev/null; \
-		dd if=/dev/zero bs=262096 count=1 conv=sync 2>/dev/null | tr "\000" "\377"; \
+		dd if=/dev/zero bs=$$((0x40000 - $(hdrlen))) count=1 conv=sync 2>/dev/null | tr "\000" "\377"; \
 		cat $@; \
 	) > $@.new
 	mv $@.new $@