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Extracting Existing Kernel + Ramfs

Enter the machine using adb shell

Run cat /proc/partitions

  #  Path                     Purpose        Size
  0 /dev/block/mmcblk0                       7761920
  1 /dev/block/mmcblk0p1      data           6085631

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Preface

Before anything or any comments or ideas, this is a way I wanted to try to inform and update what a device tree is and what it has, and finally how Custom Recovery is created. So this is not a complete guide and it won't be! I never intended to do that.

The original idea

Please take a look and may you take a few minutes to read the original guide. I had written myself that I intended to update the information. I hope that after reading the original guide you can go back and have a few minutes of reading and mainly practice to gain experience.

This guide comes to complement or update some important information. All thanks to @rokibhasansagar about first guide Make A TWRP Tree For Your Device & Build

Certainly, given the breadth of the subject, it should have many more parts. But understand about "Minimal" thinking and that I didn't intend to extend it any further than necessary. So the guide has:

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A small Device Tree Bringup Guide

Introduction

So, you guys might be wondering, how do these "Developers" get your favourite Custom roms, such as LineageOS, Paranoid Android etc., to their own devices. Well I'm here to Guide you on how to do it, specifically on how to bringup or make your own device tree from scratch or adapting.

Gist of this Guide: This is for people with genuine interest in Android OS porting/development. After going through this guide, you should be able to do a total device tree bringup on your own.

Prerequisite: Certain requirements are to be met before you start with this amazing journey.

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#!/bin/bash

# author: Marcos Oliveira <terminalroot.com.br>
# describe: Clone Only a Git Subdirectory
# version: 1.0
# license: GNU GPLv3

if [[ "$(echo $LANG | cut -c 1-2)" != "pt" ]]; then
	declare -x l=( "usage" 
		       "Use this flag to inform the REPOSITORY, this option is not optional." 

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So You Think You Know Git

Dump of all commands from "So You Think You Know Git - FOSDEM 2024":

• https://www.youtube.com/watch?v=aolI_Rz0ZqY

The full blog post: https://blog.gitbutler.com/git-tips-and-tricks/

Some Helpful Config Stuff

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If you have a huge repository (in size and in history) and want to add a subfolder 
to your project as a submodule you can follow this example to save time and space
using git's shallow clone and shallow checkout feature. It is a bit more complicated
in this example because I assume that you want your submodule to track a non-default
branch, called `mybranch`, instead of the `master` branch. Things could probably get
a lot simpler when using the default branch. After following the commands in these
examples you can use `git submodule update` and `git submodule update --remote` as normal.

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How To Make A Working TWRP Device Tree For Your MediaTek Device & Start Building Them, Online

This Guide is tested on 64-bit mt6735/53 chipset device. It will also work on any 64-bit and 32-bit devices.

You will need something from your Stock ROM first. Get them all and Try to modify it using the procedure.

Note: This guide will be helpful for you if you have older mediatek devices (android-5.1 or android-6.0), but up-to-date devices can also work.

Update: This guide had a few typos and derps (Oops..), but I've tried to make it free of those now (Dated November 18, 2020)

Bonus: You can also use this tool by @SebaUbuntu, @yshalsager and @mauronofrio to auto generate the twrp tree. The tool is best if your device runs on android-9.0. The tools is still not 100% compatible to all devices, but I'll still recommend it and give it 8.5/10 in the scale of varsatility.

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#!/bin/bash

################
# Uncomment if you want the script to always use the scripts
# directory as the folder to look through
#REPOSITORIES="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
REPOSITORIES=`pwd`

IFS=$'\n'

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Install Docker Desktop for Windows with WSL2 backend

Video tutorial

A video is available that elaborates on the involved technologies and goes through these steps if you would prefer that format:

Installing Docker Desktop with WSL2 back end

References

I used the following references to learn how to install Docker Desktop and WSL2:

• Docker Desktop WSL 2 backend