• Journal of the Korea Society of Computer and Information
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• v.11 no.4 s.42
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• pp.261-269
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• 2006

In this paper we has implemented a tour guide terminal using the embedded linux. The implemented terminal can locate its position using GPS interface and display the sightseeing information of the current location. With view of this implementation results, we confirmed the possibility of embedded linux terminal as a tour guide PDA. The realtime update of sightseeing information using a mobile communication functionality will be included in our future works.

• Proceedings of the Korea Information Processing Society Conference
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• 2024.05a
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• pp.202-204
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• 2024

메모리 오류는 소프트웨어 개발 과정에서 발생할 수 있는 가장 일반적이면서도 치명적인 문제 중 하나다. 이러한 문제를 효과적으로 탐지하고 수정하기 위해, 개발자들은 다양한 메모리 오류 탐지 도구를 활용한다. 그러나, 이 기술들은 소스 코드가 필요하다는 중대한 제약이 있다. 특히 임베디드 시스템의 개발 과정에서는 종종 소스 코드 대신 컴파일된 바이너리 형태로만 펌웨어가 제공되곤 한다. 이러한 배경을 바탕으로, 본 연구는 임베디드 환경에서 발생할 수 있는 메모리 오류를 실시간으로 탐지하기 위한 새로운 접근 방식을 제안한다. 이를 위해, Dynamic ASan 이라는 기술을 QEMU 가상화 기술에 적용함으로써, 메모리 접근 시 메모리 안정성을 지속적으로 검증하는 시스템을 구축하였다. 이러한 접근 방식은 임베디드 시스템의 안정성과 보안을 개선하는 데 중요한 기여를 할 수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.853-855
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• 2005

오늘날 생활환경에서 디지털 TV, 휴대용 단말기, 인터넷 셋톱박스 등 임베디드 시스템이 탑재된 정보가 전제품을 쉽게 찾아 볼 수 있다. 정보가전제품은 가전제품의 본래 기능뿐만 아니라 다른 정보가전제품과 상호 작용을 통한 인텔리전트한 기능의 수행이 요구된다. 이와 같은 인텔리전트한 기능을 수행하기 위해서는 단순한 기능만을 수행하는 펌웨어 수준의 임베디드 시스템이 아니라 다양한 기능을 수행하는 스마트 임베디드 시스템이 요구된다. 스마트 임베디드 시스템은 인텔리전트한 기능을 제공하기 위해서 네트워킹, 멀티프로세싱 등의 기능이 제공되는 범용 운영체제 수준의 성능을 가진 운영체제의 탑재가 요구된다. 그러나 이러한 범용 운영체제는 수십 초의 긴 부팅 시간을 요구함으로 이전의 파워온 (Power-On)과 동시에 사용할 수 있는 전통적인 가전제품이나 산업기계의 사용자에게는 매우 큰 불편을 초래할 수 있다. 특히 복잡한 공정을 수행하는 공장 산업기계의 임베디드 시스템은 shutdown 후 정상가동 까지 걸리는 시간이 제품 생산량 및 품질에 큰 영향을 미친다. 이와 같이 다양한 분야에서 적용된 스마트 임베디드 시스템의 부팅시간은 스마트 임베디드 시스템의 성능을 평가하는 중요한 요소가 된다. 본 논문은 임베디드 환경 하에 범용 운영체제인 리눅스를 활용하여 빠른 부팅을 구현하였다. 부팅 단계에서 영향을 미치는 부트로더, 커널 그리고 루트 파일시스템의 각 구성요소를 최적화하는 연구를 수행하였으며, 그 결과 HBE-EMPOS II 기준으로 부팅시간이 11초로 감소되는 성과를 얻었다.

• The Journal of Information Technology
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• v.6 no.3
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• pp.65-73
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• 2003

The evaluation AP embedded Linux board is implemented. The board is made of IBM 405 GP processor, PPCBoot-1.2.1 boot loader, Linux-2.4.21 kernel and root file system. The evaluation board has two flash memories, boot flash and application flash of size 512Kbyte and 16Mbyte, respectively. And it supports IEEE 802.11a which provide the maximum throughput of 54Mbps in the 5.2GHz frequency band. MTD(Memory Technology Device) and JFFS2(Journalling Flash File System version 2) technologies are adopted to optimally package the system software, boot loader, kernel and root file system. And in order to optimize root file system, busybox package and tiny login are used. Linux kernel and root file system is combined together with mkimage utility.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.12
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• pp.2173-2180
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• 2006

Linux has peculiarities of safety, flexibility, and open source. and Linux supports various hardware platforms. But because general Linux was designed for high performance H/W, Linux has several points to support for embedded system with limited resource. Specially, a main point is booting time that is spent to tens of second. In this paper, we purpose a fast booting scheme of Linux for Embedded System and estimate a performance of scheme purposed through realized prototype. Specially, to reduce booting time in environment of embedded system, we optimize boot loader, kernel and root file system. As a result, boot time reduce 28 second to 11 second in HBE-EMPOS II.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.773-776
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• 2006

This paper has implemented a tour guide terminal using the embedded linux. The implemented terminal can locate its position using GPS interface and display the sightseeing information of the current location. With view of this implementation results, we confirmed the possibility of embedded linux terminal as a tour guide PDA. The realtime update of sightseeing information using a mobile communication functionality will be included in our future works.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.5
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• pp.901-906
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• 2006

In this paper, we describe the implementation of the digital photo frame system that displays the images coming through the memory card of a digital camera. Each image can be recorded with voice in this system, and a function of the mp3 player is implemented as well. We use Intel PXA255 to control the system and modify the bootloader and linux kernel. Also we adapt device driver for this system. For the realization of image display, voice recording and mp3 playing in the basis of the linux system, we program some of the Microwindows system configuration files and program applications here. This study will be a good example to access the development of the digital photo frame based on the linux system using less-power and high performed embedded processor.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.12
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• pp.2298-2305
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• 2007

Many people is studying the embedded system. The embedded system becomes a small size device. The DOM memory is using in the mobile device and small site devices. This paper proposes light-weighted Linux O.S that is running onto the DOM memory. The embedded system with the DOM must have a light-weigthed O.S due to the memory space restriction. This paper designs light-weigthed Linux O.S for the DOM memory. The new designed LILO boot loader boots the new designed light-weigthed Linux O.S as a normal Linux O.S. This paper experiments comparing the designed new light-weigthed Linux O.S with a Linux PC.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.801-804
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• 2009

In this paper, the Linux kernel memory map was analyzed as the approach to Improving performance for Embedded Linux system. Since the Linux kernel memory map supporting a stability and various H/W platforms and in which it becomes to the general purpose system with optimization manages the role of being important in the booting time and the efficient system utilization of resources, the analysis of the kernel memory map is required for the performance improvement of the Embedded Linux system in which it is restrictive the resources. According to the analysis result, and of the Linux kernel memory, the booting speed of and improvement of the memory efficiency were confirmed. It is therefore considered that the proposed in this paper and kernel memory allocation method are suitable to the memory availability improvement of the Embedded Linux system.

• Journal of Advanced Navigation Technology
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• v.24 no.5
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• pp.438-443
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• 2020

To transfer files between nodes on network based on Ethernet, file transfer protocol (FTP) on TCP/IP and trivial file transfer protocol (TFTP) on UDP/IP are mostly used. Due to the lack of resources (processor, memory and so on) in the embedded system where we generally use for simple works with small firmware like ones; many of the systems implement only UDP/IP for their network stacks. Thus, TFTP is greatly to be preferred. For examples, environmental sensor devices for sensor networks, Boot Loader for general embedded device and preboot execution environment (PXE) boot for PC provide the TFTP. The logic of TFTP is simple for file transmission but, there is Stop-And-Wait problem during the process which occurs long blocking time. In this paper, we propose an algorithm which called QuTFTP(Quick UDP Trivial File Transfer Protocol) to reduce the length of the blocking time and to be compatible with the legacy TFTP.