Hi xuyanjie,

> -using vfio, use the following commands to load the vfio driver and bind
it
> +using vfio, use the following commands to to load the vfio driver and
bind it

Seems that also here you need to rebase the patch against most recent code.

Change of "to to" => "to" was fixed by the following patch by me (from
December 2018)
https://mails.dpdk.org/archives/dts/2018-December/004567.html

Regards,
Rami Rosen