@genz10
I will write how to compile your own firmware. However I will probably need to continue over a few posts as I am finding it a bit hard to write everything at once. I already started writing the steps involved once and accidentally lost what I wrote. If you require any further detail in any of the steps, let me know and I will explain that part in greater detail. I will try to write the guide in a step-by-step process as much as possible.

To compile the firmware, you need to have Linux installed. The chipset manufacturer HiSilicon only provides a Linux development toolchain. A virtual machine is sufficient.
The HiSilicon SDK compatible with the HiSilicon Hi3518eV200 chipset needs to be downloaded. On my Box account, I have hosted a number of SDKs. The latest compatible SDK I have is Hi3518E V200R001C01SPC040. Please keep in mind that due to file size restrictions on my Box account, I had to split the SDK into 6 pieces. The SDK can be downloaded from:
https://app.box.com/s/cibs7n1mgvhqaqjlidtveegu1uajt5yr
Extract the SDK archive to a convenient location (if you downloaded the SDK I provide, all 6 files are required). This archive contains lots of tools and documentation for software development for several HiSilicon camera chipsets.
The SDK needs to be installed on your Linux machine. Extract the SDK archive. It is located within 01.software --> board directory. For Hi3518E V200R001C01SPC040, the SDK filename is Hi3518E_SDK_V1.0.4.0.tgz.
Depending upon your Linux installation, you may or may not need to modify sdk.unpack and common.sh and change the first line from #!/bin/sh to #!/bin/bash.
Execute sdk.unpack as root to install the SDK and setup all environment variables on your Linux machine.
Clone my git repository. git clone https://github.com/shadow-1/yi-hack-v3.
Create a folder where your home partition will be developed. A good directory structure I would think is yi-hack-v3/build/home.
You will need to obtain a clean 'home' partition for your particular camera. You can use my yi-hack-v3 firmware as a base. However it is a better choice to start with an unmodified base, you can use the recovery images I have hosted on my Box account as a base. Download the appropriate home partition file. For example home_h20.
From my firmware images, strip off the uboot header. For example dd bs=1 skip=64 if=home_h20 of=home_h20.jffs2
The raw jffs2 partition needs to be mounted so that the files can be copied. Example commands are listed below that will need to be adapted to your exact setup. They will need to be executed as root.

mkdir /mnt/cam
modprobe mtdblock
modprobe mtdram total_size=12992 erase_size=64
dd if=home_h20.jffs2 of=/dev/mtdblock0
mount -t jffs2 /dev/mtdblock0 /mnt/cam

Copy the contents of the firmware image to your development area. For example cp -R /mnt/cam/* ./yi-hack-v3/build/home.
Unmount the partition file. Execute the following example code as root umount /mnt/cam.
For proxychains-ng support, I replace the cloud application with a script. The cloud application needs to be renamed. Example command is as follows mv ./yi-hack-v3/build/home/app/cloudAPI ./yi-hack-v3/build/home/app/cloudAPI_real.
The additional files for the updated firmware need to be copied to the home partition. Example command is as follows cp -R ./yi-hack-v3/src/home/* ./yi-hack-v3/build/home

How to compile my own firmware? #23

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