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image: add cameo-factory command

This command enables factory image generation for Cameo boards. On
upgrade the vendor firmware will check the size of the provided image
and if a specific string is located at the end of the binary.
cameo-factory will generate an image that the vendor firmware accepts.

Tested on a D-Link DIR-825 C1 with vendor firmwares 3.01 and 3.04.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>
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micmac1 authored and chunkeey committed Dec 1, 2018
1 parent 2630aae commit 247fdceab6caa1d3bc29ca629833a2f705eb9d59
Showing with 12 additions and 0 deletions.
  1. +12 −0 include/image-commands.mk
@@ -44,6 +44,18 @@ define Build/buffalo-dhp-image
mv $@.new $@
endef

# blow up binary to given size and put a given string at its end:
# cameo-factory <size[k]> <string>
define Build/cameo-factory
factory_stamp=$(word 2,$(1)); \
((reduced_size=$(subst k,*1024,$(word 1,$(1)))-$${#factory_stamp})); \
( \
dd if=$@ bs=$$reduced_size conv=sync; \
echo -n $$factory_stamp; \
) > $@.new && \
mv $@.new $@
endef

define Build/eva-image
$(STAGING_DIR_HOST)/bin/lzma2eva $(KERNEL_LOADADDR) $(KERNEL_LOADADDR) $@ $@.new
mv $@.new $@

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