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add more notes on android-prepare-vendor

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Daniel Micay 2019-05-01 12:15:52 -04:00
parent cdaaf36957
commit 3f47a7b542
1 changed files with 9 additions and 1 deletions
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@ -205,6 +205,14 @@ git am ../chromium_patches/*.patch</pre>
<p>This section does not apply to devices where no extra vendor files are required (HiKey, HiKey 960, emulator, generic targets).</p>
<p>Many of these components are already open source, but not everything is set up to
be built by the Android Open Source Project build system. Switching to building these
components from source will be an incremental effort. In many cases, the vendor files
simply need to be ignored and AOSP will already provide them instead. Firmware cannot
generally be built from source even when sources are available, other than to verify
that the official builds match the sources, since it has signature verification (which
is an important part of the verified boot and attestation security model).</p>
<p>Extract the vendor files corresponding to the matching release:</p>
<pre>vendor/android-prepare-vendor/execute-all.sh -d DEVICE -b BUILD_ID -o vendor/android-prepare-vendor
@ -213,7 +221,7 @@ rm -rf vendor/google_devices/DEVICE
mv vendor/android-prepare-vendor/DEVICE/BUILD_ID/vendor/google_devices/* vendor/google_devices/</pre>
<p>Note that android-prepare-vendor is non-deterministic unless a timestamp parameter is
passed.</p>
passed with <code>--timestamp</code> (seconds since Epoch).</p>
<h2>Building</h2>