制作ubifs文件系统
1,安装相关的软件包
apt-get install liblzo2-dev
2,获取相关的工具mkfs.ubifs和ubinize
这两个工具是制作ubifs文件系统的时候用到，它们是mtd-utils工具包中的内容，mtd-utils工具包你可以从下面的网站下载和编译出来：
官方网站：http://www.linux-mtd.infradead.org/index.html
资源下载网站：http://git.infradead.org/
3,创建一个create-ubifs.sh脚本，主要是调用mkfs.ubifs和ubinize工具和相关参数来制作ubifs文件系统，内容如下：
#!/bin/bash
##########################################################
# Script to generate ubifs filesystem image. #
##########################################################
##### ubinize configuration file
config_file=rootfs_ubinize.cfg
##### Function to check result of the command
check_result() {
if [ $? -ne 0 ]
then
echo "FAILED"
else
echo "SUCCESSFUL"
fi
}
###### Function to check whether an application exists
check_program() {
for cmd in "$@"
do
which ${cmd} > /dev/null2>&1
if [ $? -ne 0 ]
then
echo
echo "Cannot find command \"${cmd}\""
echo
exit 1
fi
done
}
if [ $# -ne 5 ]
then
echo
echo 'Usage: create-ubifs.sh [page_size_in_bytes] [pages_per_block][partition_size_in_bytes] [blocks_per_device][path_to_rootfs]'
echo
exit
fi
page_size_in_bytes=$1
echo "Page size [$page_size_in_bytes]bytes."
pages_per_block=$2
echo "Pages per block [$pages_per_block]"
partition_size_in_bytes=$3
echo "File-system partition size[$partition_size_in_bytes]bytes."
blocks_per_device=$4
echo "Blocks per device [$blocks_per_device]"
path_to_rootfs=$5
# wear_level_reserved_blocks is 1% of total blcoks perdevice
wear_level_reserved_blocks=`expr $blocks_per_device /100`
echo "Reserved blocks for wear level[$wear_level_reserved_blocks]"
#logical_erase_block_size is physical erase block size minus 2pages for UBI
logical_pages_per_block=`expr $pages_per_block - 2`
logical_erase_block_size=`expr $page_size_in_bytes \*$logical_pages_per_block`
echo "Logical erase block size[$logical_erase_block_size]bytes."
#Block size = page_size * pages_per_block
block_size=`expr $page_size_in_bytes \*$pages_per_block`
echo "Block size [$block_size]bytes."
#physical blocks on a partition = partition size / blocksize
partition_physical_blocks=`expr $partition_size_in_bytes /$block_size`
echo "Physical blocks in a partition[$partition_physical_blocks]"
#Logical blocks on a partition = physical blocks on a partitiion -reserved for wear level
patition_logical_blocks=`expr $partition_physical_blocks -$wear_level_reserved_blocks`
echo "Logical blocks in a partition[$patition_logical_blocks]"
#File-system volume = Logical blocks in a partition * Logical eraseblock size
fs_vol_size=`expr $patition_logical_blocks \*$logical_erase_block_size`
echo "File-system volume [$fs_vol_size]bytes."
echo
echo "Generating configuration file..."
echo "[rootfs-volume]" > $config_file
echo "mode=ubi" >>$config_file
echo "image=rootfs_ubifs.img" >>$config_file
echo "vol_id=0" >>$config_file
echo "vol_size=$fs_vol_size" >>$config_file
echo "vol_type=dynamic" >>$config_file
echo "vol_name=system" >>$config_file
echo
# Note: Check necessary program for installation
#echo -n "Checking necessary program forinstallation......"
#check_program mkfs.ubifs ubinize
#echo "Done"
#Generate ubifs image
echo -n "Generating ubifs..."
./mkfs.ubifs -x lzo -m $page_size_in_bytes -e$logical_erase_block_size -c $patition_logical_blocks -orootfs_ubifs.img -d $path_to_rootfs
check_result
echo -n "Generating ubi image out of the ubifs..."
./ubinize -o ubi.img -m $page_size_in_bytes -p $block_size -s$page_size_in_bytes $config_file -v
check_result
rm -f rootfs_ubifs.img
rm -f $config_file
(4)将mkfs.ubifs和ubinize以及create-ubifs.sh放置在同一目录下，然后调用create-ubifs.sh即可创建ubifs文件系统，create-ubifs.sh用法如下：
create-ubifs.sh page_size_in_bytes(页大小)pages_per_block(每个扇区的页数量)partition_size_in_bytes(分区大小)blocks_per_device(扇区数量)path_to_rootfs(文件系统路径)
举例如下：
./create-ubifs.sh 2048 64 83886080 4096 ./rootfs
上面命令的意思是调用create-ubifs.sh将当前目录下的rootfs文件夹的内容制作成ubifs文件系统，nandflash的页大小为2k,每个扇区有64页，
总共有4096个扇区，要制作的文件系统的大小为83886080字节。
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/jiajie961/archive/2010/11/08/5994713.aspx