add support 4g -- >ppp

hc

2023-11-24 2b26ab132d1b33b91c84c6d732456200e8c5ee77

 u-boot/scripts/README.rockchip
..
..
@@ -33,7 +33,7 @@
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 		./scripts/stacktrace.sh dump.txt tpl
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 	# avbtool.py
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-		./avbtool.py info_image --image vbmeta.img
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+		./scripts/avbtool.py info_image --image vbmeta.img
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 [tools]
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 	# resource_tool