工程目录下创建ota目录

前后两版软件分别make otapackage -j48，每次分别拷贝用于升级的ota包到工程目录下的ota目录下，取名字为old和new两版zip

以下报错：

build01@build-pc:~/aml/mx/git_m6_1225$ ./build/tools/releasetools/ota_from_target_files -i ota/old.zip  ota/new.zip ota/update.zip
unzipping target target-files...
Traceback (most recent call last):
  File "./build/tools/releasetools/ota_from_target_files", line 951, in <module>
    main(sys.argv[1:])
  File "./build/tools/releasetools/ota_from_target_files", line 903, in main
    OPTIONS.info_dict = common.LoadInfoDict(input_zip)
  File "/home/build01/aml/mx/git_m6_1225/build/tools/releasetools/common.py", line 114, in LoadInfoDict
    raise ValueError("can't find recovery API version in input target-files")
ValueError: can't find recovery API version in input target-files
build01@build-pc:~/aml/mx/git_m6_1225$

原因是zip文件不对，不是升级用的zip（out/target/product/g18ref/g18ref-ota-20140628.zip），

而是out/target/product/g18ref/obj/PACKAGING/target_files_intermediates/g18ref-target_files-20140628.zip

正确的打印如下

build01@build-pc:~/aml/mx/git_m6_1225$ ./build/tools/releasetools/ota_from_target_files -i ota/old.zip  ota/new.zip ota/update.zip
unzipping target target-files...
using device-specific extensions in device/amlogic/common
unzipping source target-files...
unable to load device-specific module; assuming none
Loading target...
Loading source...
3 diffs to compute
    0.14 sec      297 /   280045 bytes (  0.11%) system/etc/recovery-resource.dat
    3.29 sec      251 /  6163076 bytes (  0.00%) system/lib/libXXXjni.so
    3.42 sec      249 /  6326752 bytes (  0.00%) system/lib/libXXX.so
building image from target_files BOOT...
building image from target_files BOOT...
building image from target_files RECOVERY...
building image from target_files RECOVERY...
boot      target: 4622336  source: 4620288  diff: 3542860
boot image changed; including.
recovery image changed; including as patch from boot.
 Signing Whole File
done.
build01@build-pc:~/aml/mx/git_m6_1225$

总结

考虑签名不一样，只能在同一个账号下发布，而且每次备份升级软件的时候把差分源zip和ota升级zip一起备份，以备全新升级和制作差分包升级使用。