本来想到ubuntu 模拟 jffs2 文件操作， 但是发现按照网上的操作流程缺mtdchar.ko,请问有没有高手碰到过?
http://blog.csdn.net/u014780165/article/details/43192663
一. 挂载操作
1. sudo modprobe mtdram total_size=16384
2. sudo modprobe mtdchar
3. sudo dd if=mtd.jffs2 of=/dev/mtd0
4. sudo modprobe mtdblock
5. sudo modprobe jffs2
6. sudo mount -t jffs2 -o rw /dev/mtdblock0 jffs2_dir
二. 卸载操作
1. sudo umount jffs2_dir
2. sudo rmmod jffs2 mtdblock mtdchar mtdram mtd_blkdevs mtd
三. 说明
1. mtd.jffs2为打包的jffs2文件
2. jffs2_dir为要挂载的目录
我的操作系统是Ubuntu 14.04LTS
[ 0.000000] Linux version 4.2.0-42-generic (buildd@lgw01-55) (gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) ) #49~14.04.1-Ubuntu SMP Wed Jun 29
20:22:11 UTC 2016 (Ubuntu 4.2.0-42.49~14.04.1-generic 4.2.8-ckt12)
这两个命令也执行了
sudo apt-get install mtd-utils
sudo apt-get install mtd-tools
xxx@ubuntu:/tmp$ sudo modprobe mtdchar
modprobe: FATAL: Module mtdchar not found.
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/lib/modules/4.2.0-42-generic/kernel/drivers/mtd/
这个目录下面也确实有mtdchar.ko的文件，
肿么办?
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为了跟踪这个问题， 我特意去 kernel.org 下载了最新版本的Linux,
wget https://www.kernel.org/pub/linux/kernel/v4.x/linux-4.13.11.tar.xz
准备配置编译make menuconfig,
可是怎么样也找不到MTD CHAR的相关选项，
然后我打开 drivers/mtd/Makefile drivers/mtd/Kconfig
#
# Makefile for the memory technology device drivers.
## Core functionality.
obj-$(CONFIG_MTD) += mtd.o
mtd-y := mtdcore.o mtdsuper.o mtdconcat.o mtdpart.o mtdchar.oobj-$(CONFIG_MTD_OF_PARTS) += ofpart.o
obj-$(CONFIG_MTD_REDBOOT_PARTS) += redboot.o
obj-$(CONFIG_MTD_CMDLINE_PARTS) += cmdlinepart.o
obj-$(CONFIG_MTD_AFS_PARTS) += afs.o
obj-$(CONFIG_MTD_AR7_PARTS) += ar7part.o
obj-$(CONFIG_MTD_BCM63XX_PARTS) += bcm63xxpart.o
obj-$(CONFIG_MTD_BCM47XX_PARTS) += bcm47xxpart.o
obj-y += parsers/
发现 mtdchar根本不是单独编译的， 而是和其他一起打包成 *.ko,
看起来就是 mtd.ko 了
所以我们只需要 modprobe mtd 就可以达到 sudo modprobe mtdchar 一样的效果，
所以不要纠结 sudo modprobe mtdchar 的问题了。
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然后一步一步创建 jffs2.img 文件， 挂载， 成功！
感谢，真的可以了。
sudo modprobe mtd
sudo modprobe mtdblock
sudo modprobe jffs2
sudo modprobe mtdram total_size=25536
sudo dd if=jffs2.img of=/dev/mtd0
最后
cityf@ubuntu:/disk4$ ls /tmp/ccc/
bin dev lib linuxrc mnt proc sbin sys tmp usr
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cityf@ubuntu:/disk4$ sudo rmmod mtdram
cityf@ubuntu:/disk4$ sudo modprobe mtdram total_size=25536 erase_size=4
cityf@ubuntu:/disk4$ sudo dd if=jffs2.img of=/dev/mtd0
51072+0 records in
51072+0 records out
26148864 bytes (26 MB) copied, 0.0904095 s, 289 MB/s
cityf@ubuntu:/disk4$ sudo mount -t jffs2 -o rw /dev/mtdblock0 /tmp/ccc/
cityf@ubuntu:/disk4$ cat /proc/mtd
dev: size erasesize name
mtd0: 018f0000 00001000 "mtdram test device"
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我把上面这种方法再试了一次,
发现烧到V3s的spi flash之后
sudo rmmod mtdram
sudo modprobe mtd
sudo modprobe mtdblock
sudo modprobe jffs2
sudo modprobe mtdram total_size=20480 erase_size=4
sudo dd if=jffs2.bin of=/dev/mtd0
mkdir /tmp/ccc/
sudo mount -t jffs2 -o rw /dev/mtdblock0 /tmp/ccc/
###在/tmp/ccc 这里编辑修改文件哦###
sudo umount /tmp/ccc###生成jffs2镜像文件
sudo dd if=/dev/mtd0 of=jffs2_1.bin
dd conv=notrunc if=jffs2_1.bin of=image1.bin bs=$((0xC00000)) seek=1
cp image1.bin /mnt/hgfs/F/
[ 47.725265] jffs2: Header CRC failed on REF_PRISTINE node at 0x00880ff8: Read 0x20011904, calculated 0x3481ff1c
[ 48.215271] jffs2: Data CRC failed on REF_PRISTINE data node at 0x00881ed4: Read 0x98083a15, calculated 0x06eaab93
[ 48.705294] jffs2: Data CRC failed on REF_PRISTINE data node at 0x00882ef8: Read 0x169b0f33, calculated 0xdfd649b9
[ 49.075311] jffs2: Data CRC failed on REF_PRISTINE data node at 0x00883f48: Read 0x1f0b0e43, calculated 0xf8136e0e
[ 49.385349] jffs2: Data CRC failed on REF_PRISTINE data node at 0x00884e38: Read 0x3e9cb261, calculated 0xfb37277c
[ 49.575365] jffs2: Data CRC failed on REF_PRISTINE data node at 0x00885ce4: Read 0xf1a86ad1, calculated 0xa59e13ee
[ 49.765426] jffs2: Data CRC failed on REF_PRISTINE data node at 0x00886c20: Read 0xa9890ad3, calculated 0x2b6a90ca
[ 49.955485] jffs2: Node CRC failed on REF_PRISTINE data node at 0x00887fdc: Read 0x192297f7, calculated 0x977e8568
[ 50.025579] jffs2: Data CRC failed on REF_PRISTINE data node at 0x008887d4: Read 0x8a599699, calculated 0xa81f0dbb
[ 50.158858] jffs2: Data CRC failed on REF_PRISTINE data node at 0x008898f4: Read 0x2d8cd776, calculated 0x2a6686fe
[ 50.465276] jffs2: Data CRC failed on REF_PRISTINE data node at 0x0088af30: Read 0x08f81c8f, calculated 0xc9a3c5d6
[ 51.555257] jffs2: Node CRC failed on REF_PRISTINE data node at 0x0088bfe8: Read 0xc1e0d851, calculated 0x049ccfa7
[ 52.705568] jffs2: Data CRC failed on REF_PRISTINE data node at 0x0088c858: Read 0xc3eaed7a, calculated 0x9eac2cf3
[ 52.716774] jffs2: Data CRC failed on REF_PRISTINE data node at 0x0088c858: Read 0xc3eaed7a, calculated 0x9eac2cf3
[ 52.727688] jffs2: Data CRC c3eaed7a != calculated CRC 9eac2cf3 for node at 0088c858
[ 52.735464] jffs2: read_cache_page() returned error: -5
[ 52.740688] jffs2: Error garbage collecting node at 0088c858!
[ 52.746442] jffs2: No space for garbage collection. Aborting GC thread
文件系统出现这种问题，
运行根本不正常,
所以这种方法用电脑读jffs2的镜像文件尚可，
但是要回写还是算了吧.
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