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This article mainly explains "what is the method of compiling Android7.1.2 system device tree". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the method of compiling Android7.1.2 system device tree".

1 install JDK

1) Android8.1 system compilation depends on JAVA 8. OpenJDK needs to be installed before compilation. The installation commands are as follows:

Add-apt-repository ppa penjdk-r/ppa

Apt-get update

Sudo apt-get install openjdk-8-jdk

2) if you have previously installed another version of JDK, you need to switch the version. If you have not installed it, you can skip this step and check the version of Java that is currently installed on the system, and use the following command:

Update-java-alternatives-l

Check whether the corresponding jdk (java javac, etc.) is in the jdk menu of ubuntu, and view the command to switch jdk, as shown below:

Sudo update-alternatives-config java

Enter the selection corresponding to java8 and press enter to confirm.

2. Overall compilation of android7.1.2

This section describes how to compile the Android7.1.2 source code as a whole, that is, the uboot,kernel,Android image is compiled all at once.

Note: compiling an Android7.1.2 system must provide more than 4G of memory to the Ubuntu system. Here, "providing more than 4G memory" means more than just setting up the allocation of 4G memory in the VMware Workstations virtual machine. For example, when users compile, the total memory of the PC machine is 6G, and 4G memory is allocated in the virtual machine, but in the Windows system, with QQ, antivirus software, music player, browser, etc., so that the memory occupied under Windows is almost 2G, then the virtual machine is automatically adjusted to occupy only 2G or even less than 2G of memory, so it may not be able to compile through. The correct way to allocate memory is to first allocate more than 4 gigabytes of memory to the virtual machine, then turn off as many unnecessary applications as possible under Windows, and shut down the background programs for as many applications as possible. Of course, if the user's PC is 8 gigabytes or 16 gigabytes of memory, whatever you want.

Android7.1.2 source code in the network disk directory "03 system firmware burning and compilation chapter\ 05 development board system source code compilation\ 03-imx6Q source code\ device tree android7.0 source code", the compressed package is first decompressed under windows, and then decompressed to get a separate compressed package "iTOPiMX6_android7.1.2_20200708.tar.gz". Extract the "iTOP-iMX6_android7.1.2_20200708.tar.gz" package to Ubuntu14 (the author created a new imx6q directory in the / home directory, copied and extracted the source code to the imx6q directory; the plus version of the author created a new iMX6-PLUS directory). Note: the decompression command here, including the later decompression command, the date of the compressed package can be a little different, the user should adjust according to the actual situation.

Use the decompression command "tar-vxf iTOP-iMX6_android7.1.2_20200708.tar.gz" to extract the source code, and then get the "iTOP-iMX6_android7.1.2" folder, as shown in the following figure.

Use the command "cd iTOP-iMX6_android7.1.2" to go to the "iTOP-iMX6_android6.0.1" directory, as shown in the following figure. Using the ls command, you can see the compilation script "create.sh", which is the script compiled by the system as a whole.

The configuration of 1G core board uboot is a little different from that of 2G core board. If the user has 2 gigabytes of memory, use the default configuration. If the user has 1GB of memory, enter "bootable/bootloader/uboot- imx/board/freescale/mx6sabresd", as shown in the following figure, the memory configuration code in the "mx6qp.cfg" file, "mx6qp.cfg_1G" is the 1G memory configuration file, and "mx6qp.cfg_2G" is the 2G configuration file. 2G core board users need to use "mx6qp.cfg_1G" file to overwrite "mx6qp.cfg", use the command "cp-rmx6qp.cfg_1G mx6qp.cfg".

Continue to introduce the use of the compilation script "create.sh". Note: if you want to compile the iMX6PLUS version of uboot,kernel, as well as the Android7.1.2 file system, you need to add the parameter "plus" at compile time, that is, ". / create.sh plus", as shown in the following figure.

Note: if you want to compile iMX6Q versions of uboot, kernel, and Android7.1.2 file systems, you need to add the parameter "6Q" at compile time, that is, ". / create.sh 6Q", as shown in the following figure.

Note: if you want to compile iMX6D versions of uboot, kernel, and Android7.1.2 file systems, you need to add the parameter "6d" at compile time, that is, ". / create.sh 6d". Start the compilation, as shown in the following figure.

The compilation is complete, as shown in the following figure, and the resulting image is in the "out/target/product/sabresd_6dq" directory.

After the compilation is completed, use the command "cd out/target/product/sabresd_6dq" to enter the image directory, and using the ls command, you can see that the mirror files such as "u-boot.imx", "system.img", "recovery.img" and "boot-topeet_10.1.img", "boot-topeet_7.img" and "boot-topeet_9.7.img" are generated. The above images generated by the compilation are all the images of Android7.1.2.

Thank you for your reading, the above is the content of "what is the method of compiling the device tree of the Android7.1.2 system". After the study of this article, I believe you have a deeper understanding of what the method of compiling the device tree of the Android7.1.2 system is, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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