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VDK -based file system design and implementation

Author: SuGuoLi
Tutor: MaYue；SunJianWei
School: Graduate School,Chinese Academy of Sciences
Course: Applied Computer Technology
Keywords: VDK Embedded File System JFFS2 Flash memory MTD
CLC: TP316
Type: Master's thesis
Year: 2009
Downloads: 9
Quote: 2
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Abstract


With the development of embedded technology and hardware prices fell , embedded system's storage capability to rapidly increase ; other hand, the application of the data generated is also increasing , these data need management, embedded file system so important sex becomes increasingly prominent. ADI's Blackfin VDK other DSP processor developed for its lightweight RTOS kernel, you can give full play to the Blackfin hardware features , but does not provide file system support . This paper discusses common abroad Flash file system characteristics, analyzes the key technology JFFS2 file system , based on the file system on the VDK given an implementation plan: First, to implement the system in VDK adaptation layer to provide JFFS2 file system dependence of the Linux kernel functions . File System topdown is divided into four levels, namely : the user interface layer , JFFS2 file system layer , MTD layer and Flash driver layer . User interface layer encapsulates the entire file system for the upper application to provide a unified , standard API interface. In the JFFS2 file system layer transform the original data structure, so that all directories and files in the file system is mounted organized as a binary tree, in this based on the given file path to quickly locate the corresponding document node ; in the transformation of the original based on the data structure , reconstruction VDK thread between documents , all threads created when open the same file data structure organized into lists , and the structural organization of the data JFFS2 together to achieve the VDK between threads and an open file the effective organization and management. MTD layer shielding operational details of various Flash chips to achieve the upper and the specific Flash chips irrelevant . Flash driver layer to achieve the specific Flash chips read, write and erase other operations. The file system implementation in Blue dragonfly embedded IP-PBX development board for the functionality, performance and reliability of three aspects of the test , the test results show that the file system implementation to achieve the desired objectives , in line with product application requirements.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer software > Operating system
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