The /dev/tty about busybox 1.10

[宋涛]

starting pid 14, tty '': '/etc/init.d/rcS'
/----script in rcS
mkdir: cannot create directory '/var/cache': Unknown error 17
mkdir: cannot create directory '/var/respawnd': Unknown error 17
mkdir: cannot create directory '/var/run': Unknown error 17
mkdir: cannot create directory '/var/respawnd/fatal': Unknown error 17
mkdir: cannot create directory '/var/respawnd/non_fatal': Unknown error 17
Executing Upgrade Script
--end script in rcS/
Can't open /dev/tty2: Unknown error 2onsole.
Can't open /dev/tty3: Unknown error 2
Can't open /dev/tty4: Unknown error 2
process '-/bin/sh' (pid 22) exited. Scheduling for restart.
process '-/bin/sh' (pid 23) exited. Scheduling for restart.
process '-/bin/sh' (pid 24) exited. Scheduling for restart.
Can't open /dev/tty2: Unknown error 2
Can't open /dev/tty3: Unknown error 2
Can't open /dev/tty4: Unknown error 2
process '-/bin/sh' (pid 25) exited. Sche


Then if i type enter,

"

#
#
#
#
process '-/bin/sh' (pid 460) exited. Scheduling for restart.
process '-/bin/sh' (pid 461) exited. Scheduling for restart.
process '-/bin/sh' (pid 462) exited. Scheduling for restart.
Can't open /dev/tty2: Unknown error 2
Can't open /dev/tty3: Unknown error 2
Can't open /dev/tty4: Unknown error 2
ls
bin         home        lib         mnt         root        usr
dev         isfs        linuxrc     part2       sbin        var
etc         jffs2       lost+found  proc        tmp         www
#
"

I can type shell command,but the screen keep scrolling to find /dev/tty2..

i don't know why.thanks
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