You're reading from Mastering Embedded Linux Programming - Third Edition

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Published inMay 2021

PublisherPackt

ISBN-139781789530384

Edition3rd Edition

Concepts

Embedded Systems

Authors (2):

Frank Vasquez

Chris Simmonds

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Filesystems for NOR and NAND flash memory

To use raw flash chips for mass storage, you have to use a filesystem that understands the peculiarities of the underlying technology. There are three such filesystems:

JFFS2 (Journaling Flash File System 2): This was the first flash filesystem for Linux and is still in use today. It works for NOR and NAND memory, but is notoriously slow during mount.
YAFFS2 (Yet Another Flash File System 2): This is similar to JFFS2, but specifically for NAND flash memory. It was adopted by Google as the preferred raw flash filesystem on Android devices.
UBIFS (Unsorted Block Image File System): This works in conjunction with the UBI block driver to create a reliable flash filesystem. It works well with both NOR and NAND memory, and since it generally offers better performance than JFFS2 or YAFFS2, it should be the preferred solution for new designs.

All of these use MTD as the common interface to flash memory.

JFFS2

The Journaling...

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Mastering Embedded Linux Programming - Third Edition

Published in: May 2021Publisher: PacktISBN-13: 9781789530384

Authors (2)

Frank Vasquez

Frank Vasquez is an independent software consultant specializing in consumer electronics. He has over a decade of experience designing and building embedded Linux systems. During that time, he has shipped numerous devices including a rackmount DSP audio server, a diver-held sonar camcorder, and a consumer IoT hotspot. Before his career as an embedded Linux engineer, Frank was a database kernel developer at IBM where he worked on DB2. He lives in Silicon Valley.
Read more about Frank Vasquez

Chris Simmonds

Chris Simmonds is a software consultant and trainer living in southern England. He has almost two decades of experience in designing and building open-source embedded systems. He is the founder and chief consultant at 2net Ltd, which provides professional training and mentoring services in embedded Linux, Linux device drivers, and Android platform development. He has trained engineers at many of the biggest companies in the embedded world, including ARM, Qualcomm, Intel, Ericsson, and General Dynamics. He is a frequent presenter at open source and embedded conferences, including the Embedded Linux Conference and Embedded World.
Read more about Chris Simmonds

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