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Search - "treble is pain to port"
Porting 8.1 to old device is really pain but thats nothing compared to whats to come.
Google annouced Project Treble and it does that vendor shit is on partition and init files are edited to make them load. Then you can run GSI (Generic System Image). When it was released all developers said that its impossible to bring support for it unofficialy. Then some guys on XDA ported it to Xiaomi phone. Great they proved almost entire XDA wrong. Great. Then few phones did the same. Amazing. Now almost any phone with good dev can be trebelized. Great. Well the device needs 400MB+ partition that is unused so that we can add vendor files there. Well its issue on my phone since i dont have that big unused partition. FUCK. Well i have 11.1GB Virtual SDcard partition. Hmmmm maybe i can resize that partition and create new partition of size 500MB to make it as vendor. OK great. Once thats solved then just copy them and done. WRONGGGGGGGGGGGGG. Its not that easy. First you need to make a script that places all device releated shit into vendor. OK thats easy. Then comes the hard part. Those vendor files have no fucking clue they are in not in system folder. So they start loading shit and ofcourse they will fail if they are not in system. Well most users think we are done thats its over. Its not. HEX editing comes to the rescue. You edit every single blob to make it compatible with vendor partition. OK after that hell pain you are almost done. Just edit init files and try GSI. It will probably fail to boot. Now you search logs for missing crap and slowly add that until it boots.
So this is ahead of me since i dont have 8.1 support yet. But once its done then im coming for you treble. Ohhhhhh how cool would it be to run android P on Xperia P ?
Sure you can skip treble porting but its better if you do it since it makes porting new android version soooooooo much easier.11