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→Download orangepi-build from github
# The Linux sdk actually refers to the code of orangepi-build. orangepi-build is modified based on the armbian build system. Using orangepi-build, multiple versions of Linux images can be compiled. First download the code of orangepi-build, the command is as follows:
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test@test:~$ '''sudo apt-get update'''
test@test:~$ '''sudo apt-get install -y git'''
test@test:~$ '''git clone https://github.com/orangepi-xunlong/orangepi-build.git <span style="color:#FF0000">-b next</span>'''|}
::{| class="wikitable" style="background-color:#ffffdc;width:800px;" |-| <big>'''Note that the Orange Pi 3B development board needs to download the source code of the <span style="color:#FF0000">next </span> branch of orangepi-build. The above git clone command needs to specify the branch of the orangepi-build source code as next.'''</big>
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[[File:cm4-img390.png|center]]
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|}::{| class="wikitable" style="background-color:#ffffdc;width:800px;" |-| <big>'''Downloading the orangepi-build code through the git clone command does not require entering the user name and password of the github account (the same is true for downloading other codes in this manual), if the Ubuntu PC prompts the user to enter the github account after entering the git clone command The name and password are usually entered incorrectly in the address of the orangepi-build warehouse behind the git clone. Please check the spelling of the command carefully, instead of thinking that we forgot to provide the username and password of the github account.'''</big>|}
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<li>The u-boot and Linux kernel versions currently used by the development board are as follows</li></ol>
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| '''branch'''
| '''Linux5.10'''
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<big>'''The branch mentioned here is not the same thing as the branch of the orangepi-build source code, please do not confuse it. This branch is mainly used to distinguish different kernel source code versions.'''
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<li><p>orangepi-build will contain the following files and folders after downloading</p>
<li><p>'''LICENSE''': GPL 2 license file</p></li>
<li><p>README.md: orangepi-build documentation</p></li>
<li><p>'''scripts''': General script for compiling Linux images</p></li></ol></li></ol>{| class="wikitable" style="width:800px;" |-|
test@test:~/orangepi-build$ '''ls'''
'''build.sh external LICENSE''' README.md '''scripts'''|}{| class="wikitable" style="background-color:#ffffdc;width:800px;" |-| <big>'''If you downloaded the code of orangepi-build from github, after downloading, you may find that orangepi-build does not contain the source code of u-boot and Linux kernel, nor does u-boot and Linux kernel need to use cross-compilation tools Chain, this is normal, because these things are stored in other separate github warehouses or some servers (the addresses will be detailed below). orangepi-build will specify the address of u-boot, Linux kernel and cross-compilation toolchain in the script and configuration file. When running orangepi-build, when it finds that there are no such things locally, it will automatically go to the corresponding place to download them.'''</big>|}</ol></li></ol><span id="download-the-cross-compilation-toolchain"></span>
=== Download the cross-compilation toolchain ===
