我捣鼓了很久，都不能用U盘启动，打死都挂载不到/overlay。
Filesystem Size Used Available Use% Mounted on
rootfs 14.0M 1.4M 11.8M 11% /
/dev/root 2.3M 2.3M 0 100% /rom
tmpfs 61.5M 492.0K 61.1M 1% /tmp
/dev/ubi0_1 14.0M 1.4M 11.8M 11% /overlay
overlayfs:/overlay 14.0M 1.4M 11.8M 11% /
tmpfs 512.0K 0 512.0K 0% /dev
/dev/sda1 18.6G 55.0M 17.6G 0% /mnt/sda1
/dev/sda3 32.1G 47.9M 30.4G 0% /mnt/resources
不管我怎么改设置，/overlay 始终被/dev/ubi0_1给占着
我挂载成功了，现在可以从U盘启动了
在官方wiki里面找到原因了
There exists an issue where option target '/overlay' does not mount as the overlay, and the issue appears to be the "/". Eliminating the forward slash eliminates the issue; therefor, the command should be option target 'overlay'
原来在14.07里面，不能用
option target '/overlay'
需要使用
option target 'overlay'
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