Extract vendor blobs and make a device tree
I'm trying since many time to get a CM (now Lineageos)13/14.1 build for my device, which is a Huawei Mediapad T1-A21W (codename: hwt1a21l) with EMUI 3.0 (Kit Kat 4.4.4) but i'm limited for the following reasons:
- There are no device tree to work with.
- No vendor blobs to work with.
Basically there are absolutely zero development or base to start with, so i have to make the device tree and extract the vendor blobs in order to archieve what i want. Fortunately i have the kernel source downloaded from Huawei web.
Well, about the device tree:
after a lot of searches and setups i have created a device tree, but what i don't understand is when i compare mine (this) with another one that i know it's completely functional, for example this one from my OnePlus One, the second one (OnePlus One) it has a huge amount of files and directories that mine doesn't have, so i don't understand where they came from. Also i don't really understand where some parameters are from, for example, the OnePlus One's BoardConfig.mk has a huge amount of targets (not sure if it's called that way, target=parameters) that mine doesn't have.
Maybe it is not the best idea compare a OnePlus with a Huawei because they are from different brands, but any way what i explained before it can be applied to a similar device to mine (Honor 4X codename: cherry) which is almost identical to my device in terms of hardware, they have the same cpu and board. (cannot link it because of lack of reputation).
About the vendor blobs:
I've tried to follow many guides that explain how to get the vendor blobs. While the 90% of them are based on existing vendor blobs, the other ones i found are based on a script called extract-files.sh which it is supposed to be located in device_vendor_codename, and automatically extact the vendor files based in the content of another file called propietary-files.txt. The problem is that there is no extract-files.sh and propietary-files.txt files in my device path (device_huawei_hwt1a21l) and i don't know how i'm supposed to get them. The script is not a problem because i can download one and easily adapt it to my device, but the big problem is the specific vendor files to be extracted (propietary-files.txt) which i cannot control.
Answer
You can find remaining files for your device from the /system/etc folder. It consists of various configurations required by your device. And then there's build.prop which can be renamed to system.prop and added to the device tree.