共查询到19条相似文献,搜索用时 218 毫秒
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主要对嵌入式Linux系统软件平台的关键技术进行了分析,包括Bootloader的一般功能,stage1和stage2的主要步骤;内核的启动过程、组成结构以及基于不同平台特点的移植工作;驱动开发的特点和要点;内核编译过程的简介.项目实践表明,该分析讨论对实际嵌入式开发有重要的指导意义. 相似文献
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介绍了VxWorks BSP的开发流程,分析了VxWorks的启动过程,给出了面向三星S3C44B0X处理器的BSP设计、网络驱动及加载VxWorks的实现方法.其中重点介绍了BSP的移植流程及网络驱动实现过程. 相似文献
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本文介绍了以AT91RM9200为核心的Vx Works嵌入式实时系统的设计步骤及过程,其中包括硬件设计、开发环境建立、系统的启动过程分析、驱动程序设计及任务调度等方面内容,该系统适用于多种控制和信息处理领域. 相似文献
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基于ARM核的S3C4510B启动代码的研究与应用 总被引:6,自引:3,他引:3
研究了ARM核处理器S3CA510B的中断异常处理机制和启动代码的任务及运行过程。分析了在REMAP(存储系统重映射)情况下中断向量设置、存储系统配置、堆栈初始化、代码拷贝、应用程序运行环境初始化过程,以及GNU下链接文件编写和定义规则。最后在基于GNU编译器的EMBESTIDE开发环境下,成功设计完成了S3CA510B的启动代码,给出据该启动代码的一个应用实例。研究了ARM核处理器S3CA510B的中断异常处理机制和启动代码的任务及运行过程。分析了在REMAe(存储系统重映射)情况下中断向量设置、存储系统配置、堆栈初始化、代码拷贝、应用程序运行环境初始化过程,以及GNU下链接文件编写和定义规则。最后在基于GNU编译器的EMBESTIDE开发环境下,成功设计完成了S3CA510B的启动代码,给出据该启动代码的一个应用实例。 相似文献
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文章介绍了三层交换机的硬件设计构架,重点对其板级支持包(BSP)及系统启动过程做了详细的分析;不仅分析了启动引导部分和系统启动部分的设计体系,还描述了启动引导部分和系统启动部分的实现过程,以及BSP主要函数实现的功能及相互之间的关系.最后,针对本三层交换机系统做了优化. 相似文献
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基于PXA255的RedBoot启动分析及其移植 总被引:1,自引:0,他引:1
介绍了嵌入式处理器PXA255的结构特点和应用,研究了一种嵌入式系统引导、调试程序RedBoot。阐述了RedBoot/eCos的基本机构和特点,分析了它的原理和启动过程。并依据代码,详细分析了其在PXA255开发平台上的实现。研究了移植过程中的重点和难点问题,总结了移植的一般性方法,便于对Bootloader和PXA255的开发应用。 相似文献
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针对主流可信操作系统的完整性保护展开深入研究,建立了主流可信操作系统信息完整性保护的基本要求,在此基础上,阐述了Vista操作系统中信息完整性保护实现框架.以Windows Vista操作系统为例,详细研究了系统的启动过程和引导程序的加载过程中信息的保护措施,尤其是对操作系统启动过程,采用可信模型逐级传递信息的机制.除此之外,重点对其可信任启动实现策略进行深入分析,论证其保证信息可信任性的核心技术和实现方法.最后,以对操作系统中网络控制进行分析,建立了一套基于信息完整性的典型的网络访问服务运行环境. 相似文献
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本文通过分析嵌入式系统的启动过程,设计实现了基于SD/MMC存储卡的直接启动方案.该方案基于AMBA总线,采用硬件描述语言(Verilog HDL)实现SD/MMC启动控制器,利用EDA工具VCS进行仿真,synplify进行综合,采用Altera公司的FPGA进行验证.全文从系统架构设计出发,详细介绍了启动过程的硬件设计和软件流程,最后给出仿真、综合和FPGA验证结果. 相似文献
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主要介绍了在Windows 2003 Server,Windows 2000 Server等操作系统上安装远程启动服务的原理与方法,采用VC6.0编程,实现了把Windows NT4.0的远程启动服务程序移植安装到Windows 2003 Server,Windows 2000 Server等服务器上。编写的软件具有使用方便、稳定可靠等特点。为在新网络操作系统上安装无盘工作站、无盘终端提供了良好基础。 相似文献
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V.34调制解调器数据通信建立过程的研究 总被引:1,自引:0,他引:1
本文深入分析了目前最高速率的话带调制解调器V.34的数据通信建立过程,主要介绍了线路检测、参数训练和带纠错的快速握手规程等几种重要新技术,并说明这三者在V.34中的作用和相互关系。 相似文献
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According to the triple helix model, the government, private companies, and universities play an important role in the development of the regional economy and the growth of clusters. Although balanced interaction with the three players is important in the triple helix model, our study points out that these three players have no choice but to compete. In this study, we conducted meta-frontier analysis (MFA) using three groups, the government, private companies, and universities, which are mentioned in the triple helix model to compare the efficiency of information and communication technology (ICT) startup companies. Therefore, we can see which ICT startup companies have grown up. As a result, the government-led cluster is the most efficient, followed by private company-led cluster and finally university-led cluster. Here, we compared all the clusters of ICT startup companies, unlike previous studies which only focused on a few clusters. Also, we provided another implication that the strengths of startup companies in each cluster can change depending on their geographic location. 相似文献
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嵌入式系统启动代码的分析与移植以及嵌入式操作系统内核的移植是整个嵌入式系统开发中最重要的环节之一。在分析嵌入式系统架构以及相应开发流程的基础上,结合温湿度控制功能需求,采用ARM S3C2440处理器的嵌入式系统底层启动代码与操作系统的设计方案,实现向应用层提供底层服务功能,编译出的U-Boot与Linux内核。最后进行了系统测试,在ARM平台上运行良好。 相似文献
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光纤陀螺对温度比较敏感,由于温度引起的零偏漂移是光纤陀螺工作尤其是启动过程中的一种较大误差。文中为了减小光纤陀螺启动过程的零偏漂移、缩短启动时间,提出了对光纤陀螺启动过程进行补偿的方案。该方案以光纤陀螺温度和温度变化率为输入、光纤陀螺漂移为输出建立二输入单输出的RBF神经网络,用于陀螺启动过程补偿。在室温下对某型号光纤陀螺启动漂移进行了补偿,试验结果表明该方法能有效减小陀螺的启动温度漂移,缩短陀螺启动时间。将该方案运用到某型号的光纤陀螺寻北仪上,常温试验表明,该方案大大缩短了寻北仪的准备时间,提高了寻北精度。 相似文献
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Clock is an essential part of most of the integrated circuits as time base reference. It must be very accurate, highly reliable and readily available as soon as it is enabled. In all types of oscillator architectures, crystal oscillator is the most accurate and stable clock generator. But usually the crystal oscillator circuit suffers from slow startup. Therefore, it is essential to improve the startup time with optimally controlled crystal drive such that crystal drive power rating is not compromised. We propose a method that discusses about increasing the negative resistance during startup, using a startup circuit for fast start. Once the reliable startup is achieved, the negative resistance is decreased and the startup circuit is disconnected. The reduction in negative resistance is done with current steps and there are two ways in which it is achieved, the Digital control method and Analog control method. In digital control method, the current steps are timed at regular intervals and in analog control method, oscillator output amplitude is given as feedback to the startup circuit there by reducing the negative resistance. In the 32768 Hz real time clock generating oscillator, the startup time can be improved from 330 ms to 220 ms using the conventional startup method. With the proposed digital control method, lesser startup time of 160 ms is achieved and in analog control method it is further reduced to 120 ms. 相似文献
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The problem focus is on startup decisions associated with staged venture financing, where both R&D and marketing are significant percentages of overall expenses. When should a startup owner acquire working capital, and how should she/he distribute that capital between R&D (to improve product quality) and marketing (to increase sales) to ultimately grow valuation? Also, should the startup owner cap the total R&D and marketing budgets to increase profitability during staged venture financing? We develop a model to study resource acquisition and allocation decisions across successive stages of startup growth. The model incorporates a funding process whereby the startup valuation is positively impacted by improved product quality and market growth. This model provides insights on optimal acquisition and allocation practices and characterizes the impact of changes in productivity, along with the evolution rate of R&D and marketing payoffs, on the underlying decisions. Our results also illustrate conditions for optimal capping of R&D and marketing expenses as a percentage of revenues. 相似文献