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Construction of YAFFS2 File System on Large Storage Nand FLASH under Embeded Linux

Meng Zhang

Abstract

YAFFS2 has been added support for the new Nand FLASH with 2 k bytes pages and strictly sequential page writing order,such as zero rewriting.It is a good realization to manage Nand FLASH in embedded system.This paper analyzes how YAFFS2 improve on two aspects of the garbage collection strategy and the use of checkdata compared to YAFFS1.The method to design Nand FLASH hardware interface and MTD driver is also introduced.Based on Intel Xscale PXA255,Linux 2.4.19,The means and process to build YAFFS2 file system on large storage Nand FLASH with 2 k bytes pages is presented.

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Key concepts: NAND gate, Flash file system, Operating system, Computer science, Byte, Flash (photography), File system, Garbage collection