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update README.md. 

Signed-off-by: Annie_wang <annie.wangli@huawei.com>
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## Introduction<a name="section11660541593"></a>
OpenHarmony LiteOS-M is a lightweight operating system kernel designed for the Internet of Things (IoT) field. It features small footprint, low power consumption, and high performance. It has a simple code structure, including the minimum kernel function set, kernel abstraction layer, optional components, and project directory. The LiteOS-M kernel is divided into the hardware layer and hardware-irrelevant layers. The hardware layer provides a unified hardware abstraction layer (HAL) interface for easier hardware adaptation. A range of compilation toolchains can be used with different chip architectures to meet the expansion of diversified hardware and compilation toolchains in the Artificial Intelligence of Things (AIoT) field.**Figure1** shows the architecture of the LiteOS-M kernel.
OpenHarmony LiteOS-M is a lightweight operating system kernel designed for the Internet of Things (IoT) field. It features small footprint, low power consumption, and high performance. It has a simple code structure, including the minimum kernel function set, kernel abstraction layer, optional components, and project directory. The LiteOS-M kernel is divided into the hardware layer and hardware-irrelevant layers. The hardware layer provides a unified hardware abstraction layer (HAL) interface for easier hardware adaptation. A range of compilation toolchains can be used with different chip architectures to meet the expansion of diversified hardware and compilation toolchains in the Artificial Intelligence of Things (AIoT) field.
**Figure1** shows the architecture of the LiteOS-M kernel.
**Figure 1** Architecture of the OpenHarmony LiteOS-M kernel<a name="fig0865152210223"></a>
![](figures/architecture-of-openharmony-the-liteos-cortex-m-kernel.png "OpenHarmony-LiteOS-M Kernel Architecture")
## Directory Structure<a name="section161941989596"></a>
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### Obtaining the OpenHarmony Source Code
Obtain the latest OpenHarmony source code through Git clone on a Linux server. For details about how to obtain the source code, see [Source Code Acquisition](https://gitee.com/openharmony/docs/blob/HEAD/en/device-dev/get-code/sourcecode-acquire.md). This document assumes that the clone directory is `~/openHarmony` after the complete OpenHarmony repository code is obtained.
Obtain the latest OpenHarmony source code through Git clone on a Linux server. For details about how to obtain the source code, see [Source Code Acquisition](https://gitee.com/openharmony/docs/blob/HEAD/en/device-dev/quick-start/quickstart-lite-env-setup-linux.md). This document assumes that the clone directory is `~/openHarmony` after the complete OpenHarmony repository code is obtained.
### Obtaining the Source Code of the Sample Project