android img mount

record

mkdir /media/temp2
sudo mount -o loop *.img /media/temp2
sudo umount /media/temp2

mkdir /media/temp1
mount -o loop a.img /media/temp1
umount /media/temp1

copy /media/temp1 or temp2 a new directory and modify
use mkyaffs2image new directory to ?.img

create a nand flash img file.