Ramdisk技术应用于RTEMS文件系统的研究

Research and Implementation of the Filesystems on RTEMS Based on Ramdisk Technology

目前大多数嵌入式系统使用基于Flash设备的文件系统,但由于Flash设备成本较高、速度较慢,并不适合对数据进行频繁的访问和查询,因此在这种情况下,考虑选用在嵌入式设备中成本低、容量大、速度快的内存上来建立文件系统。利用Ramdisk技术在内存中模拟磁盘设备,配置并初始化Ramdisk,在经过分析FAT分区组织形式的基础上编写格式化函数将Ramdisk格式化为FAT文件系统,从而实现了RTEMS上文件系统的创建。

Now most of the embedded systems use the filesystems based on flash media for storing, accessing and managing data, Since flash chips are not suitable for frequent data access and query operations due to high cost and low speed, DRAM is used as a major medium for embedded filesystems. it expatiates on simulating a disk device on DRAM with Ramdisk technology and initializing and configuring this Ramdisk, then programming a function for formatting Ramdisk to implement the filesystem on RTEMS on the basis of understanding FAT partition format.