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README.md
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README.md
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## Introduction<a name="section11660541593"></a>
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The OpenHarmony LiteOS Cortex-A is a new-generation kernel developed based on the Huawei LiteOS kernel. Huawei LiteOS is a lightweight operating system \(OS\) built for the Internet of Things \(IoT\) field. With the rapid development of the IoT industry, OpenHarmony LiteOS Cortex-A brings small-sized, low-power, and high-performance experience and builds a unified and open ecosystem for developers. In addition, it provides rich kernel mechanisms, more comprehensive Portable Operating System Interface \(POSIX\), and a unified driver framework, Hardware Driver Foundation \(HDF\), which offers unified access for device developers and friendly development experience for application developers. [Figure1](#fig27311582210) shows the architecture of the OpenHarmony LiteOS Cortex-A kernel.
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The OpenHarmony LiteOS Cortex-A is a new-generation kernel developed based on the Huawei LiteOS kernel. Huawei LiteOS is a lightweight operating system \(OS\) built for the Internet of Things \(IoT\) field. With the rapid development of the IoT industry, OpenHarmony LiteOS Cortex-A brings small-sized, low-power, and high-performance experience and builds a unified and open ecosystem for developers. In addition, it provides rich kernel mechanisms, more comprehensive Portable Operating System Interface \(POSIX\), and a unified driver framework, Hardware Driver Foundation \(HDF\), which offers unified access for device developers and friendly development experience for application developers. [Figure 1](#fig27311582210) shows the architecture of the OpenHarmony LiteOS Cortex-A kernel.
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**Figure 1** Architecture of the OpenHarmony LiteOS Cortex-A kernel<a name="fig27311582210"></a>
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├── bsd # Code of the driver and adaptation layer module related to the FreeBSD, such as the USB module
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├── compat # Kernel API compatibility
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│ └── posix # POSIX APIs
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├── drivers # Kernel driver
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├── drivers # Kernel drivers
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│ └── char # Character device
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│ ├── mem # Driver for accessing physical input/output (I/O) devices
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│ ├── quickstart # APIs for quick start of the system
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├── lib # Kernel library
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├── net # Network module, which mainly derives from the lwIP open-source project
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├── platform # Code for supporting different systems on a chip (SOCs), such as Hi3516D V300
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│ ├── hw # Logic code related to clocks and interupts
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│ ├── hw # Logic code related to clocks and interrupts
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│ ├── include # Header files exposed externally
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│ └── uart # Logic code related to the serial port
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├── platform # Code for supporting different systems on a chip (SOCs), such as Hi3516D V300
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## Usage<a name="section741617511812"></a>
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OpenHarmony LiteOS Cortex-A supports the [Hi3518E V300](https://gitee.com/openharmony/docs/blob/master/docs-en/quick-start/introduction-to-the-hi3518-development-board.md) and [Hi3516D V300](https://gitee.com/openharmony/docs/blob/master/docs-en/quick-start/introduction-to-the-hi3516-development-board.md). You can develop and run your applications based on both development boards.
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OpenHarmony LiteOS Cortex-A supports the [Hi3518E V300](https://gitee.com/openharmony/docs/blob/master/en/device-dev/quick-start/introduction-to-the-hi3518-development-board.md) and [Hi3516D V300](https://gitee.com/openharmony/docs/blob/master/en/device-dev/quick-start/introduction-to-the-hi3516-development-board.md). You can develop and run your applications based on both development boards.
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### Preparations<a name="section1579912573329"></a>
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You need to set up the compilation environment on Linux.
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- For Hi3518E V300, see [Setting Up the Hi3518 Development Environment](https://gitee.com/openharmony/docs/blob/master/docs-en/quick-start/setting-up-the-hi3518-development-environment.md).
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- For Hi3516D V300, see [Setting Up the Hi3516 Development Environment](https://gitee.com/openharmony/docs/blob/master/docs-en/quick-start/setting-up-the-hi3516-development-environment.md).
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- For Hi3518E V300, see [Setting Up the Hi3518 Development Environment](https://gitee.com/openharmony/docs/blob/master/en/device-dev/quick-start/setting-up-the-hi3518-development-environment.md).
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- For Hi3516D V300, see [Setting Up the Hi3516 Development Environment](https://gitee.com/openharmony/docs/blob/master/en/device-dev/quick-start/setting-up-the-hi3516-development-environment.md).
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### Source Code Acquisition<a name="section11443189655"></a>
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Download and decompress a set of source code on a Linux server to acquire the [source code](https://repo.huaweicloud.com/harmonyos/os/1.0/code-1.0.tar.gz). For more acquisition methods, see [Source Code Acquisition](https://gitee.com/openharmony/docs/blob/master/docs-en/get-code/source-code-acquisition.md).
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Download and decompress a set of source code on a Linux server to acquire the [source code](https://repo.huaweicloud.com/harmonyos/os/1.0.1/code-1.0.1.tar.gz). For more acquisition methods, see [Source Code Acquisition](https://gitee.com/openharmony/docs/blob/master/en/device-dev/get-code/source-code-acquisition.md).
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### Compilation and Building<a name="section2081013992812"></a>
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For details about how to develop the first application, see:
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- [Developing the First Example Program Running on Hi3518](https://gitee.com/openharmony/docs/blob/master/docs-en/quick-start/developing-the-first-example-program-running-on-hi3518.md)
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- [Developing the First Example Program Running on Hi3518](https://gitee.com/openharmony/docs/blob/master/en/device-dev/quick-start/developing-the-first-example-program-running-on-hi3518.md)
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- [Developing the First Example Program Running on Hi3516](https://gitee.com/openharmony/docs/blob/master/docs-en/quick-start/developing-the-first-example-program-running-on-hi3516.md)
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- [Developing the First Example Program Running on Hi3516](https://gitee.com/openharmony/docs/blob/master/en/device-dev/quick-start/developing-the-first-example-program-running-on-hi3516.md)
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## Repositories Involved<a name="section1371113476307"></a>
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[drivers\_liteos](https://gitee.com/openharmony/drivers_liteos)
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[Kernel subsystem](https://gitee.com/openharmony/docs/blob/master/en/readme/kernel.md)
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**[kernel\_liteos\_a](https://gitee.com/openharmony/kernel_liteos_a)**
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[drivers\_liteos](https://gitee.com/openharmony/drivers_liteos/blob/master/README.md)
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**kernel\_liteos\_a**
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README_zh.md
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README_zh.md
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## 使用说明<a name="section741617511812"></a>
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OpenHarmony LiteOS-A内核支持Hi3518EV300（[介绍](https://gitee.com/openharmony/docs/blob/master/quick-start/Hi3518%E5%BC%80%E5%8F%91%E6%9D%BF%E4%BB%8B%E7%BB%8D.md)）、Hi3516DV300（[介绍](https://gitee.com/openharmony/docs/blob/master/quick-start/Hi3516%E5%BC%80%E5%8F%91%E6%9D%BF%E4%BB%8B%E7%BB%8D.md)）单板，开发者可基于两种单板开发运行自己的应用程序。
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OpenHarmony LiteOS-A内核支持Hi3518EV300（[介绍](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/Hi3518%E5%BC%80%E5%8F%91%E6%9D%BF%E4%BB%8B%E7%BB%8D.md)）、Hi3516DV300（[介绍](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/Hi3516%E5%BC%80%E5%8F%91%E6%9D%BF%E4%BB%8B%E7%BB%8D.md)）单板，开发者可基于两种单板开发运行自己的应用程序。
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### 准备<a name="section1579912573329"></a>
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开发者需要在Linux上搭建编译环境：
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- Hi3518EV300单板：参考[环境搭建](https://gitee.com/openharmony/docs/blob/master/quick-start/Hi3518%E6%90%AD%E5%BB%BA%E7%8E%AF%E5%A2%83.md)；
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- Hi3516DV300单板：参考[环境搭建](https://gitee.com/openharmony/docs/blob/master/quick-start/Hi3516%E6%90%AD%E5%BB%BA%E7%8E%AF%E5%A2%83.md)。
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- Hi3518EV300单板：参考[环境搭建](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/%E6%90%AD%E5%BB%BA%E7%8E%AF%E5%A2%83.md)；
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- Hi3516DV300单板：参考[环境搭建](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/Hi3516%E6%90%AD%E5%BB%BA%E7%8E%AF%E5%A2%83.md)。
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### 获取源码<a name="section11443189655"></a>
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在Linux服务器上下载并解压一套源代码，获取源码（[下载链接](https://repo.huaweicloud.com/harmonyos/os/1.0/code-1.0.tar.gz)）。更多源码获取方式，参考[源码获取](https://gitee.com/openharmony/docs/blob/master/get-code/%E6%BA%90%E7%A0%81%E8%8E%B7%E5%8F%96.md)。
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在Linux服务器上下载并解压一套源代码，获取源码（[下载链接](https://repo.huaweicloud.com/harmonyos/os/1.0.1/code-1.0.1.tar.gz)）。更多源码获取方式，参考[源码获取](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/get-code/%E6%BA%90%E7%A0%81%E8%8E%B7%E5%8F%96.md)。
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### 编译构建<a name="section2081013992812"></a>
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开发者开发第一个应用程序可参考：
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- [helloworld for Hi3518EV300](https://gitee.com/openharmony/docs/blob/master/quick-start/%E5%BC%80%E5%8F%91Hi3518%E7%AC%AC%E4%B8%80%E4%B8%AA%E7%A4%BA%E4%BE%8B%E7%A8%8B%E5%BA%8F.md)；
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- [helloworld for Hi3518EV300](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/%E5%BC%80%E5%8F%91Hi3518%E7%AC%AC%E4%B8%80%E4%B8%AA%E7%A4%BA%E4%BE%8B%E7%A8%8B%E5%BA%8F.md)；
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- [helloworld for Hi3516DV300](https://gitee.com/openharmony/docs/blob/master/quick-start/%E5%BC%80%E5%8F%91Hi3516%E7%AC%AC%E4%B8%80%E4%B8%AA%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F%E7%A4%BA%E4%BE%8B.md)。
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- [helloworld for Hi3516DV300](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/%E5%BC%80%E5%8F%91Hi3516%E7%AC%AC%E4%B8%80%E4%B8%AA%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F%E7%A4%BA%E4%BE%8B.md)。
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## 相关仓<a name="section1371113476307"></a>
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[drivers\_liteos](https://gitee.com/openharmony/drivers_liteos)
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[内核子系统](https://gitee.com/openharmony/docs/blob/master/zh-cn/readme/%E5%86%85%E6%A0%B8%E5%AD%90%E7%B3%BB%E7%BB%9F.md)
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**[kernel\_liteos\_a](https://gitee.com/openharmony/kernel_liteos_a)**
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[drivers\_liteos](https://gitee.com/openharmony/drivers_liteos/blob/master/README_zh.md)
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**kernel\_liteos\_a**
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