Thank MARK for the clear explanation . i can use raspberry pi 3 's openbsd as ssh server and http server . That's enough because i think server shoud not run X . ( a special sata-usb converter works well , so big space is OK )
surely now state Rpi3 cannot install lftp by ports , but by using sftp archlinux push files to Rpi3 . and robot wirh Rpi3's openbsd is controlled by ssh . other OS including linux of arm is not secure about ssh . so arm's future is open to openbsd . ---- regard http://openbsd-akita.blogspot.jp/2017/03/openbsd-61-on-raspberry-pi-3.html
