docs/wiki/Xperia-E-Dual/index.html


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<h1>Xperia E Dual</h1>
<h3>Contributors</h3>
<ul>
<li>Nicknack</li>
</ul>
<h3>What works</h3>
<ul>
<li>Compiling the kernel </li>
</ul>
<h3>What does not work</h3>
<ul>
<li>Flashing, there are problems with Sony's boot image format</li>
</ul>
<p>The built kernel boots with a black screen and no further sign of acitivity. Fastboot flashes without errors but flash offsets are probably wrong. Only known working kernels have a different ELF file format.</p>
<h3>Boot image format</h3>
<p>There is one tool avaiable for unpacking Sony's ELF boot format into the normal ANDROID format:
<a href="https://github.com/Tasssadar/libbootimg">libbootimg</a></p>
<p>Sadly, even unpacking and repacking a working prebuilt kernel doesn't seem to work.</p>
<p>I had more luck with mkelf.py script from Sony. You can loosely follow the tutorial <a href="https://www.netzgewitter.com/2013/10/compiling-android-linux-kernel-for-xperia/">here</a>. This time unpacking a working kernel elf image and repacking it with mkefl.py worked. Needed to change only a few bits with vbindiff. Now we only need to find a working set of offsets and image parts to do the same with a custom kernel!</p>
<p>Here are some links describing the problem with Sony's boot format:
<em> https://github.com/chenxiaolong/DualBootPatcher/issues/181
</em> https://github.com/Tasssadar/libbootimg/pull/2/commits/8986984b5d618be0b753e55d6b9d9d1744bc4094
* https://books.google.de/books?id=2qo6AwAAQBAJ&amp;pg=PA313&amp;lpg=PA313&amp;dq=sony+boot.img+format&amp;source=bl&amp;ots=0mtMMle9eZ&amp;sig=adCVtfarXK9cticvd5qqYA6g39Y&amp;hl=de&amp;sa=X&amp;ved=0ahUKEwjgp5mfx5XVAhUHWRQKHWSeDZcQ6AEIQzAB#v=onepage&amp;q&amp;f=false</p>
<h3>Next possible steps</h3>
<ul>
<li>Try booting pmOS with a prebuilt kernel.</li>
<li>Try repacking built kernel into ELF format</li>
<li>UART debugging?</li>
</ul>
<h3>Links</h3>
<ul>
<li>
<p><a href="https://github.com/Nicknack/pmOs_device_sony_nanhu">Device package</a></p>
</li>
<li>
<p><a href="https://github.com/Klozz/android_kernel_sony_msm7x27a-nanhu">Kernel Source</a></p>
</li>
<li><a href="https://github.com/LineageOS/android_kernel_sony_msm7x27a/">Kernel Source LineageOS</a></li>
<li><a href="https://github.com/der-koenig/android_kernel_sony_msm7x27a/tree/c5738aa4dbfa5f4b36331f07396e5eeaa12c9782">Kernel Source FreeXperia</a></li>
</ul>

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