Before You Start

This document provides guidance on how to port the Linux and LiteOS Cortex-A kernels on the OpenHarmony small system to a development board. It is intended for developers with experience in developing embedded systems. Before following instructions in this document, it is recommended that you familiarize yourself with OpenHarmony, including its technical architecture, directory structure, kernel subsystem, and driver subsystem. The following table lists the development boards that have been adapted to the small system.

Table 1 Development boards compatible with the OpenHarmony small system

Development Board	Kernel	Architecture	ROM	RAM	File System	Flash Type
hispark_taurus	LiteOS Cortex-A and Linux 4.19	Arm Cortex-A7	8 GB	1 GB	VFAT, EXT4	eMMC4.5
hispark_aries	LiteOS-A	Arm Cortex-A7	16 MB	512 MB	JFFS2	SPI NOR

In addition to the aforementioned development boards, LiteOS Cortex-A and Linux 4.19 can be ported to development boards that meet the requirements described in the table below.

Table 2 Requirements for porting OpenHarmony small system kernels

Kernel	Supported Architecture	ROM	File System	Flash Type
LiteOS-A	ARMv7	> 2 MB	VFAT, JFFS2, YAFFS2	SPI NOR, NAND, eMMC
Linux 4.19	ARM, Arm64, MIPS, x86	> 5 MB	VFAT, JFFS2, YAFFS, EXT/2/3/4, NFS	NOR, NAND, eMMC