# Before You Start
This document provides guidance on how to port the Linux and LiteOS Cortex-A kernels on the OpenHarmony [small system](https://device.harmonyos.com/en/docs/start/introduce/oem_minitinier_des-0000001105598722) 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](https://gitee.com/openharmony/docs/blob/master/en/OpenHarmony-Overview.md), 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