嵌入式Linux的BootLoader在DM6446上的实现

移植引导装载程序（BootLoader）是嵌入式系统开发的关键技术。介绍了BootLoader的特点及其在DM6446平台上的引导方式,分析U—Boot源代码的运行机制,并对U—Boot代码进行修改和调试,最后总结出移植BootLoader的成功经验,详细阐述了U—Boot在DM6446平台上的移植步骤和关键技术。这对DM6446双核处理器上的产品开发有一定的借鉴作用。     

U-Boot的分析及其在DM6446上的移植

Bootloader(引导加载程序)是嵌入式系统开发的重要环节,它使得操作系统和硬件平台联系起来,对嵌入式系统的后继软件开发十分重要.介绍了B00tloader的特点及其在DM6446平台上的引导方式,分析了U-Boot的运行机制,给出了U-Boot在DM6446平台上的移植步骤和关键技术,修改和调试了U-Boot,最...     

基于DSP的嵌入式Linux内核移植的研究与实现

为了提升嵌入式系统的开发效率,提出了一种向嵌入式平台上移植操作系统的方案。硬件平台以TMS320DM6446处理器为例,操作系统以嵌入式LINUX操作系统为例。首先,分析了软硬件平台结构。然后,实现了嵌入式Linux内核在TMS320DM6446上的移植。移植的主要内容为:交叉开发环境的建立、内核的移植,最后,将编译好的内核代码通过已经移植好的BootLoader下载到开发板上,Linux内核就成功的移植到了TMS320DM6446处理器中。     

U-Boot在LPC2210上的移植

BootLoader是在操作系统运行前执行的一段程序,是嵌入式系统开发的重要环节,它将操作系统和硬件平台衔接在一起.U-Boot作为一个功能前大的开源引导装载程序,支持包括Linux在内的众多操作系统的引导,同时其丰富的设备驱动和高度灵活的功能设置使U-Boot成为嵌入式平台标准的引导装我程序.本文针时LPC2210处理器,对U-Boot的移植步骤进行详细的阐述.     

U-Boot在S3C2440上移植和设置

BootLoader是嵌入式系统开发的重要环节,是操作系统和硬件平台联系的桥梁,对嵌入式系统的后继开发十分重要.简介了BootLoader U-Boot目录结构、工作流程及其移植的思路和引导内核的方法;给出了移植uboot-2010-03到ARM微处理器S3C2440上,所需操作环境的搭建、具体代码的修改、具体参数的设置、所需的操作命令及常见错误的处理方法等要点.最后将编译生成了U-Boot.bin文件下载到ARM微处理器S3C2440上,经过测试U-Boot可以达到设计的功能要求并能够稳定的运行而且通过对其正确的配置成功的引导了内核.     

基于TMS320DM6446的AVS—P2编码器的开发及优化

介绍了AVS—P2视频编码关键技术和数字多媒体开发平台TMS320DM6446的结构特点,研究了在该DSP上对AVS—P2视频编码器的移植和优化,取得良好效果。     

基于S3C44B0的U-Boot启动分析和移植实现

U-Boot是sourceforge网站上的一个开源项目,是当今比较流行、功能强大的BootLoader,能支持多种体系结构.本文在阐述U-Boot启动过程之后,对其在S3C4480上移植过程中的要点加以分析.最后,实现了网卡驱动程序的移植,使U-Boot功能更加强大、使用更加方便,同时也使嵌入式系统网络接口设计更加灵活.     

基于S3C2410的U-Boot的移植方法研究

针对启动加载程序BootLoader严格的依赖于具体的嵌入式硬件系统并且从头开发一套适合特定硬件系统的BootLoader又相当复杂这一问题,分析了一款功能强大的BootLoade-U-Boot的功能与目录结构,并以基于S3C2410的YC2410开发板为背景,介绍了基于S3C2410的U-Boot的移植思想及方法,并通过该方法快速将U-Boot成功的移植到了YC2410开发板上.     

基于 AT91RM9200微控制器的B00tLoader的分析与开发

嵌入式系统开发过程中的一个重要问题是如何开发BootLoader。目前已有一些通用的BootLoader,但如何根据特定的嵌入式系统平台,开发相应的BootLoader,无疑是一个重点和难点。本文选用AT9IRM9200微控制器建立了一个通信接口平台,通过阐述U-Boot分析了BootLoader开发的特点和操作模式,并通过详细地分析AT91BasicBoot的源程序,具体地说明了BootLoader需要完成的主要任务和实现方法。可见,BotLoader是操作系统和硬件的枢纽,负责初始化硬件和引导操作系统的内核。     

U-Boot在S3C44BO上的移植

BootLoader是嵌入式系统开发中的第一个环节,它紧密的将系统的软硬件联系在一起,该性能的好坏对系统的稳定性有着至关重要的影响.本文介绍BootLoader的基本概念、U-Boot在基于S3C44BO开发板上的移植过程以及中断向量表设置的一些问题.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.