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android 6.0 系统：在make otapackage时，出现如下错误：
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unable to load device-specific module; assuming none
using prebuilt recovery.img from IMAGES...
using system.img from target-files
Traceback (most recent call last):
File "./build/tools/releasetools/ota_from_target_files", line 1719, in
main(sys.argv[1:])
File "./build/tools/releasetools/ota_from_target_files", line 1674, in main
WriteFullOTAPackage(input_zip, output_zip)
File "./build/tools/releasetools/ota_from_target_files", line 610, in WriteFullOTAPackage
system_tgt = GetImage("system", OPTIONS.input_tmp, OPTIONS.info_dict)
File "./build/tools/releasetools/ota_from_target_files", line 496, in GetImage
return sparse_img.SparseImage(path, mappath, clobbered_blocks)
File "/home/guofengwan/workspace/rdadroid-6.0/build/tools/releasetools/sparse_img.py", line 50, in __init__
raise ValueError("Magic should be 0xED26FF3A but is 0x%08X" % (magic,))
ValueError: Magic should be 0xED26FF3A but is 0x23494255
make: *** [out/target/product/etau-Lensun_R635D_8810P/etau-ota-eng.guofengwan.zip] Error 1
经过查看打包脚本的py代码，分析出在build/core/Makefile中
@echo "Package OTA: $@"
$(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH MKBOOTIMG=$(MKBOOTIMG) \
./build/tools/releasetools/ota_from_target_files -v \
- --block \
加了这个block参数导致了对Magic的检查，进而出现了错误，去掉此参数后，编译通过，那么此参数的作用是什么呢？见如下文章，http://blog.csdn.net/huangyabin001/article/details/44871481
Android5.x及其之后的版本都可以使用模块式OTA来保证每个设备使用相同的分区。模块式OTA把整个分区作为一个文件并且生成一个二进制补丁，而不是对比每个文件生成对应的很多个补丁。
模块式OTA升级的开关就是--block参数。