Chapter One: Android system porting and Driver development overview

1. The process of customizing Android for a specific device is called "porting."

The 2.Android system architecture is divided into:

Tier One: The Linux kernel (mainly includes drivers and programs that manage resources such as memory, process, power, and so on).

Second tier: C + + code base (mainly including Linux, so files and DNK code embedded in the SPK program)

Layer Three: Android SDK API Direct application-oriented Java APK

Layer Fourth: Application layer, Java applications directed towards end users

The 3.Android migration is largely a migration of the Linux kernel. Linux kernel porting is primarily a porting driver.

4. If you want to see the kernel versions of other Linux systems, you can use two methods:

Method one: In terminal execution: uname-a

Method Two: In terminal execution: cat/proc/version

5.prod is an image of the system kernel, where the files are stored in memory, and he provides an interface for accessing system kernel data in a file system manner.

The 6.Linux kernel version number consists of the following parts:

Major version number, minor version number, revision number, fine-tuning version number, and special tuning for specific Linux systems.

7. Drivers are a class of programs that interact directly with the hardware and are responsible for abstracting the hardware.

The 8.Linux divides memory and peripherals into 3 categories:

1. Character devices: Devices that must be accessed in serial order

2. Block devices: can be accessed in any order, for the operation of units.

3. Network equipment.

9.HAL is unique to Android. It is not required by Android.

Chapter One: Android system porting and Driver development overview