详细解析：如何制作嵌入式Linux文件系统３

其他的情况类似如此了，下面里面给了一个lunksys的GPL项目的target。

四、生成一个ramdisk

#!/bin/sh

MODULE_NAME=ramdisk

RAMPATH=`pwd`

TMPPATH=${RAMPATH}/tmp

SOURCE=${RAMPATH}/../target

if [ ! -d ${TMPPATH} ]

then

mkdir ${TMPPATH}

fi

if [ `whoami` != 'root' ]

then {

echo "You should run the shell as root, Please rerun as a root."

echo "Aborting."

exit 1

}

fi

# Clear in tmp path

rm -rf ${TMPPATH}/tmpmnt

rm -rf ${TMPPATH}/ramrootfs

mkdir ${TMPPATH}/tmpmnt

# Clear the old ramdisk

rm -f ${RAMPATH}/$MODULE_NAME

# Make a temp file which size is suitable

dd if=/dev/zero of=${TMPPATH}/ramrootfs bs=1k count=6144

# Create a ext2 filesystem

mke2fs -F -m 0 -i 2000 ${TMPPATH}/ramrootfs

# Mount it to tmpmnt/

mount -o loop -t ext2 ${TMPPATH}/ramrootfs ${TMPPATH}/tmpmnt

# Copy everything from kernel to this.

cd ${TMPPATH}/tmpmnt

echo ${SOURCE}

cp -av ${SOURCE}/* .

cd ${TMPPATH}

# Unmount it the ext2 filesystem

umount ${TMPPATH}/tmpmnt

cat ${TMPPATH}/ramrootfs | gzip -9 > /${RAMPATH}/ramdisk

echo Copying ramdisk image to ${RAMPATH}

sync

这里给出一个自动生成脚本！

五、生成一个cramfs

找到cramfs的toolchain。/mkcramfs -r $(FS1_DIR) $(FS_NAME).1

六、生成一个mksquashfs

找到squashfs的toolchain。/mksquashfs $(FS_DIR) $(FS_NAME) -noappend -be -lzma -no-fragments -noI

做文件系统最困难和最可能出问题的地方是在/lib库和/dev方面，请大家多注意这两方面。