本文主要介绍如何在AT91SAM9261EK板子上制作和使用jffs2文件系统，使用的是linux-2.6.21内核。
首先：配置MTD
$ make menuconfig
进入 Memory Technology Devices (MTD) --->
<*> Memory Technology Device (MTD) support
[*] Debugging
[*] MTD partitioning support
[*] Command line partition table parsing
[*] Direct char device access to MTD devices
[*] Caching block device access to MTD devices
RAM/ROM/Flash chip drivers ----->
<*> Detect non-CFI AMD/JEDEC-compatible flash chips
<*> Support for AMD/Fujitsu flash chips
Mapping drivers for chip access --->
[*] Support non-linear mappings of flash chips
Self-contained MTD device drivers --->
[*] Support for AT45... DataFlash
NAND Flash Device Drivers ---->
[*] NAND Device Support
[*] Support for NAND Flash /SmartMedia on AT91
File systems ---->
<*> Second extended fs support
[*] Inotify file change notification support
[*] Inotify support for user space
<*> Filesystem in Userspace support
Miscellaneous filesystems
<*> Journalling Flash File System v2 (JFFS2) support
[*] JFFS2 write-buffering support
<*> Compressed ROM file system support (cramfs)
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以上配置中没有列出的,都没选；其配置仅做参考，可根据自己的需要自行配置。
$ make all
其次：制作mtd-util工具
从网上下载zlib-1.2.3.tar.gz 解压缩 $ cd zlib-1.2.3
$ ./configure –prefix=/usr/local/arm/3.4.1/arm-linux --shared
修改Makefile如下：
CC=arm-linux-gcc
LDSHARED=arm-linux-ld -shared
$ make all
$ make install
注意：这里是安装在/usr/local/arm/3.4.1/arm-linux目录下
由于交叉编译mtd工具时需要zlib.h文件，所以在编译之前先安装zlib库文件。
从网上下载 mtd-snapshot-20050519.tar.bz2 解压缩 $ cd mtd/util
修改该目录下的Makefile:
CROSS=arm-linux-
$ make all
然后将该目录下生成的 flash_erase,flash_eraseall, mkfs.jffs2工具放在ramdisk 文件系统中（我这里放在/bin目录下），另外在 ramdisk文件系统的dev目录下要保证有mtd0~mtd9,mtdblock0~mtdblock9这些设备，如果没有可参考 ramdisk文件系统的制作，也可从pc机相同目录下拷贝，要加上文件属性。
