title: aosp can not boot for bullhead(lg nexus 5x)
body: <p>from branch</p>
  
  <pre><code>MDB08M  android-6.0.0_r26   Marshmallow Nexus 5X, Nexus 6P
  </code></pre>
  
  <p>I did</p>
  
  <pre><code>source build/envsetup.sh
  lunch aosp_bullhead-userdebug
  make -j16
  </code></pre>
  
  <p>then fastboot </p>
  
  <pre><code>fastboot flash bootloader bootloader-bullhead-bhz10i.img       //this is from google's official rom.
  fastboot flash radio radio-bullhead-m8994f-2.6.28.0.65.img     //this is from google's official rom.
  fastboot reboot-bootloader  
  fastboot flash recovery recovery.img
  fastboot flash boot boot.img                                   //build from aosp
  fastboot flash vendor vendor.img                               //this is from google's official rom.
  fastboot flash cache cache.img                                 //build from aosp
  fastboot flash userdata userdata.img                           //build from aosp
  fastboot flash system system.img                               //build from aosp
  fastboot reboot
  </code></pre>
  
  <p>nothing, but stop at 'google' logo.</p>
  
  <p>the official factory rom could be fastboot &amp; boot succed.</p>