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1、制作第一个包
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./build.sh
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将生成的update-xxxx.img通过USB烧录到主板上，作为基础系统
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make otapackage
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./build.sh ota
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2、制作第二个包
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在apps.mk文件及相关位置，配置增加一个自定义app
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./build.sh
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make otapackage
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./build.sh ota
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3、制作差分包
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此时rockdev/Image-rk3399/下有rk3399-ota-095700.zip、rk3399-target_files-095700.zip和rk3399-ota-102203.zip、rk3399-target_files-102203.zip
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使用如下命令制作差分包：
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./build/tools/releasetools/ota_from_target_files -p out/host/linux-x86 -k build/target/product/security/testkey
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-i rockdev/Image-rk3399/rk3399-target_files-095700.zip rockdev/Image-rk3399/rk3399-target_files-102203.zip ota/rk3399-ota-diff.zip
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将结果用于OTA升级，如果使用rk3399-ota-095700.zip或rk3399-ota-102203.zip升级均正常，但使用rk3399-ota-diff.zip升级报告错误
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