Nand - Embest SBC8600B User Manual

Embest Technology Co., Ltd

3.7.2 NAND

MTD user module
JFFS2
Memory technology device
MTD chip driver
NAND flash
chip driver
GPMC module
The solid-state memory used in embedded systems is typically a flash; it is NAND
Flash in this system.
NAND Flash is used as a block device, on which the file system is established;
interaction between user and NAND Flash is mainly realized by a specific file system. In
order to realize compatibility with different Flash memories, an MTD subsystem is used to
implement management between the file system and the specific flash driver.
Therefore, users need to access NAND Flash through the following process:
Copyright © 2017 Embest Technology
App, System call
VFS
JFFS Char device
Generic NAND driver
CFI flash
driver
Modular structure for NAND
Figure 3-3
Block device
RAM,ROM
Chips etc
NAND flash
SBC8600B-UM-V2.0
39
User
Kernel
Hardware