使用fw_setenv 时报错Can't open /dev/mtd0: Permission denied
mtd0设备已经是可写的了ls -l /dev/mtd*crw-rw---- 1 root root 90, 0 Jan 1 00:00 /dev/mtd0
权限拒绝的问题https://blog.csdn.net/dropping_1979/article/details/20628817