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→Compile the source code of Android 12
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<li><p>There is a build.sh compilation script in the source code, and the compilation parameters are as follows</p>
<ol style="list-style-type:lower-alpha;"><li><p>a.-'''U''': compile uboot</p></li><li><p>b.-'''K''': compile kernel</p></li><li><p>c.-'''A''': compile android</p></li><li><p>d.-'''u''': package and generate update.img and update_spi_nvme.img</p></li><li><p>e.-'''o''': Compile the OTA package</p></li><li><p>f.-'''d''': specify kernel dts</p></li></ol></li>
<li><p>Compile uboot, kernel, android and package them into update.img</p>
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